JPH06311202A - Expanding method for link device and transfer method for the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the work efficiency by transferring the link device without changing the communication procedure to each station and adding only the changed part to the sequence program used so far. [Structure] Common link parameter 1 set by the management station that is the same for all stations and station-specific link parameter that is set for each station and determines the link device reception area of the station and 2
In order to extend the link device reception area of a certain station when executing the data link based on the contents of, the common link parameter 1 and the common link parameter 1 are set before the link device is extended. Then, the link device reception area for the changed portion is automatically input as a new unique link parameter 2'from the peripheral device and set to each station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link device expansion method capable of adding received data without changing a conventional sequence program by inputting a unique link parameter from a peripheral device, and a transfer method thereof. It is a thing.

[0002]

2. Description of the Related Art At present, there is an increasing need to perform data link between a plurality of programmable controllers by using a network due to a large scale system in a factory. In addition, it is often the case that the setting of the link parameter in the initially set data link has to be changed due to the system change such as the addition of a new line.

FIG. 13 is an explanatory diagram showing a schematic configuration of a conventional data link system. In the figure, 1
Reference numerals 2 and 13 denote programmable controllers (hereinafter, referred to as PCs) that construct a data link, respectively.
Is a PC positioned as a management station (hereinafter referred to as MPC) that controls the data link. Also, 13 is M
It is a PC positioned as a normal station (hereinafter referred to as NPC) that establishes a data link with a PC and another PC by N: N. Reference numeral 14 is a peripheral device directly connected to each of these PCs for inputting parameters and creating a sequence program.

Next, the relationship between the common link parameter and the unique link parameter will be described. The common link parameter is a link parameter that is set by the MPC 12 and is the same for all stations shared by all PCs in the network. On the other hand, for this common link parameter,
The unique link parameter is set by each NPC 13, and is a station-specific link parameter that arbitrarily sets the reception area of the own station that receives the link device set by the common link parameter.

FIG. 14 is an explanatory diagram showing the internal structure of the common link parameter and its setting example, and shows an example of the setting contents in the system structure as shown in FIG. In the figure, 15 is a machine N in the network
o. , 16 indicates the head address of the link device received by each machine, and 17 indicates the size of the link device. Further, by inputting these 15 to 17 from the peripheral device 14 (see FIG. 13) and setting them in the management station MPC12, common link parameters are set to all PC stations in the network.

Next, the setting contents of this common link parameter will be described. NPC 13 set as Unit 1
Receives the link device from address 0 to size 20, that is, address 019 in the reception area set by the common link parameter. Similarly, the number 2 is from address 020 to the address 039 and the number 3 is from address 04.
In the reception area from 0 to address 069, the link devices are set to be received.

FIG. 15 is an explanatory diagram showing an internal structure of a conventional unique link parameter and a setting example thereof, and shows an example of setting contents in the system structure shown in FIG. In the figure, 18 indicates the station order in the reception area of the link device. By setting this to each station from the peripheral device 14, each station determines its own link device receiving area.

Next, an example of setting contents of the unique link parameter will be described. In the station to which this unique link parameter is set, the order of stations in the receiving area of the link device is the order of No. 1, No. 3 and No. 2, so each unit set by the common link parameter according to this order. The link device of No. 1 is set to transfer the link device in the designated size to the receiving area in the order of the machine numbers 1, 3, 2.

FIG. 16 is an explanatory diagram showing a reception state of each station in the case of data linking without setting the unique link parameter. That is, it shows the movement of the link device when the data link is executed using the system configuration as shown in FIG. 13 only by setting the common link parameter without setting the unique link parameter. In FIG. 16, 1 is allocation of common link parameters that are the same for all stations set in the MPC 12 and has the content shown in FIG. 14, 2 is allocation of unique link parameters peculiar to each station set in each station, and 3 is each station side Is the reception area where the link device was actually received. Further, in the figure ,, and indicate the receiving areas of the link devices in each NPC 13 allocated in the common link parameter 1 and the unique link parameter 2, respectively. Further, the number on the left side of the figure shows the start address of the reception area of each station.

Next, the operation will be described. When the specific link parameter 2 is not set as shown in FIG. 16, the link devices are directly arrowed to the receiving areas of the respective stations in the station order based on the start address and size in the setting content of the common link parameter 1. It is transferred by the operation as shown.

FIG. 17 is an explanatory diagram showing the reception state of each station according to the conventional unique link parameter.
15 shows the behavior of the link device when the data link is constructed by setting the peculiar link parameter 2 with the content as shown in FIG. 15 in the state shown in FIG. When the station order of the receiving area in the unique link parameter 2 is set to 1, 3 and 2 as shown in FIG. 17, the link device receiving area of the station number 1 set in the common link parameter 1 is from address 0 to size 20. It is transferred to the receiving area of address 019, and the link device receiving area of station number 3 is set second by the unique link parameter 2, so it is set by common link parameter 1 immediately after the link device receiving area of station number 1. The size was 30
It is transferred from the address 20 to the receiving area of the address 49.

Similarly, since the link device receiving area of the station number 2 is set as the third by the unique link parameter 2, it is transferred to the receiving area as the size 20 of the address 50 to the address 69 after the link device receiving area. Will be done. The arrow in the figure indicates the operation of transferring such a link device to the reception area.

FIG. 18 is a flowchart showing the link device receiving operation of each station in the related art. First, the link device transmitted from another station is transferred to the reception area set by the common link parameter (S22),
Then, it is determined whether or not the unique link parameter is set (S23). As a result, when it is determined that the unique link parameter is not set, after the link device is received in the reception area set by the common link parameter (S25), this process is ended. On the contrary, when it is determined in step 23 that the unique link parameter is set, the link device is transferred from the receiving area set by the common link parameter to the receiving area set by the unique link parameter (S24), After receiving the link device (S25),
This process ends.

Next, a conventional processing method when the link device received by each station is expanded will be described. FIG. 19 is an explanatory diagram showing a reception state of each station when the conventional link device is expanded. That is, FIG.
Is set by the common link parameter 1 and the unique link parameter 2 having the contents described in FIG. 17, and at each station when the link device of the NPC 13 of the first station is expanded by the size 10 in the data link state. Shows the change of the reception area of. The shaded area in FIG. 19 indicates the newly expanded NP of the first station.
It is a C13 link device. In the figure, reference numeral 3'is a supplementary one for making it easier to compare the reception result of each station before the common link parameter 1 is expanded with that after the expansion.

First, the MPC 12 changes the setting of the common link parameter 1. Since the size of the first NPC 13 is expanded by 10, the address of the first NPC 13 is 0 to 29, and the address of the second NPC 13 is 30 respectively.
˜49, the address of the NPC 13 of the 3rd station is set to 50 to 79, and in the NPC 13 of the 2nd and 3rd stations, the address is the extension of the 1st station, compared with the setting of the original common link parameter. It will be shifted by one.

In the conventional unique link parameter,
Since only the station order can be set, if the link device of the common link parameter 1 is expanded as described above and the assignment contents are changed, the station order is set based on the assigned unique link parameter 2 of each station. , The link device transmitted from another station with the size of the common link parameter 1 is transferred to each reception area.

The above operation will be described with reference to FIG.
As shown in FIG. 9, the link device of the NPC 13 of the first station goes to the reception area of addresses 0 to 29 and the N
Since the link device of the PC 13 is set to the third station order by the unique link parameter 2, the addresses 60 to 79 are set.
To the reception area of the third station, the link device of the third NPC 13 is set to the second station order.
It will be transferred and received in each of the nine receiving areas. As is clear from a comparison of this with 3 ', which shows the reception state before the link device expansion, the NPCs of the second and third stations
The first address of the reception area in 13 is the NP of the first station
Only the extension of C13 will be displaced similarly to the setting in the common link parameter.

FIG. 20 shows a sequence program used in each station in the state shown in FIG.
This is because when the link device of the first NPC 13 explained in FIG.
13 shows a part of a sequence program used for constructing 13 data links. In the figure, 9 is a sequence program of the first NPC 13,
10 is a sequence program for the second NPC 13, 1
Reference numeral 1 denotes the sequence program of the NPC 13 of the third station.

Next, the operation of the conventional sequence program will be described. First, the first NPC1
When the contact of X0 is turned on in the sequence program 9 of 3, the link device B0 is turned on. Next, the first station N
When the link device B0 of the PC 13 is turned on, the contact of the link device B0 of the sequence program 10 of the second NPC 13 is turned on, and the timer T
With 0, the link device B50 is turned on 1 second later. Then, since the B50 is turned ON in the NPC 13 of the second station, the contact of the link device B50 is turned ON in the sequence program 11 of the NPC 13 of the third station, and the link device B20 is set in 1 second after the timer T0 as in the sequence program 10. Turns on.

FIG. 21 is a sequence program in which each station corrects the reception state of each station according to the unique link parameter shown in FIG. 17 in the state shown in FIG. That is, in FIG. 21, as described with reference to FIG. 19, the link device of the NPC 13 of the first station is expanded by size 10 and the address in the reception area of each station is displaced, and accordingly, in each NPC 13, It is a modification of the sequence program shown in FIG. In the figure, the portion surrounded by a broken line shows the modified portion.

First, when the contact of X0 is turned on by the sequence program 9 in the NPC 13 of the first station, the link devices B0 and B20 are turned on. Link device B20
Is added as a link device of the first NPC 13 by the link device expansion. Next, since the link device B0 in the first NPC 13 is turned on, the program 1 in the second NPC 13 is
The contact of the link device B0 of 0 is turned on, and the timer T0 turns on the link device B60 one second later.
This is B5 in FIG. 16 before the link device expansion.
Since the link device that was 0 was shifted by 10 for the link device expansion of the first station, B50 is the NPC of the second station.
It is no longer a link device set to 13, and B60
It has been corrected to.

After that, the link device B6 of the second station
When 0 is turned on, the contact of the link device B60 is turned on by the sequence program 11 of the third NPC 13, and the link device B30 is turned on after 1 second by the timer T0. Similar to B60 of the sequence program 10, as for the link device B30, B20 in FIG. 16 before expansion of the link device is shifted by the expansion amount, and B20 becomes the link device in the NPC 13 of the first station. The correction is executed because the setting of the eye link device is changed from B30.

That is, in the prior art, as described with reference to FIGS. 20 and 21, the reception area is shifted, so that the sequence program is created using the link device received there and the data link processing is executed. At each station, the sequence program used up to that point was modified each time the address of the receiving area was changed.

As other reference technical documents related to the present invention, "Reception buffer management method" disclosed in JP-A-4-35138 and "Address setting" disclosed in JP-A-2-44837. Method ", Japanese Patent Laid-Open No. Hei 3
-127104 "Data link device of programmable controller" disclosed in Japanese Patent Laid-Open No. 3-65
"Programmable controller link system" disclosed in Japanese Patent Laid-Open No. 705, "Buffer acquisition method using an external table" disclosed in Japanese Patent Laid-Open No. 4-35338, and "Japanese Patent Laid-Open No. 1-307857". There is a receive buffer control method.

[0025]

However, in the conventional link parameter extending method as described above, common link parameters are assigned in order to extend the link device received by each station. If the link device is expanded, the address of the refreshed reception area will change at each station, so the sequence program created using these link devices must be modified each time according to the changes. There was a problem that work efficiency was poor.

The present invention has been made in view of the above, and in order to expand the link device of each station, even if the setting contents in the common link parameter are changed,
Link devices can be transferred without changing the communication procedure to each station, and the sequence programs that have been used up to now can be used as they are. The purpose is to obtain an extension method and its transfer method.

[0027]

In order to achieve the above object, a link device expansion method according to the present invention has a common link parameter set by a management station and common to all stations.
In order to extend the link device reception area of a certain station when executing a data link based on the content of the station-specific link parameter that is set for each station and determines the link device reception area of the own station After changing the setting of the link parameter, the common link parameter and the unique link parameter set before the link device expansion are automatically checked, and the link device reception area for the changed portion is set to its start address and size. Is arbitrarily input as a new unique link parameter from the peripheral device and set in each station.

Further, the data link is executed based on the contents of the common link parameter set by the management station that is the same for all stations and the unique link parameter that is set for each station and that determines the link device reception area of the own station. When
In order to extend the link device coverage of a station,
After changing the setting of the common link parameter, the common link parameter and the unique link parameter set before the link device expansion are automatically checked, and the link device reception area for the changed portion is
The head address, station order, and size are arbitrarily input from the peripheral device as new unique link parameters and set to each station.

Further, based on the respective setting contents of the common link parameter set by the management station and common to all stations, and a unique link parameter unique to each station that determines a link device receiving area of its own station set in plural for each station. Then, the link device is transferred to each reception area.

[0030]

The link device expansion method according to the present invention is based on the contents of the common link parameter set by the management station that is the same for all stations and the unique link parameter that is set for each station and that determines the link device reception area of its own station. In order to extend the link device reception area of a certain station when executing data link by using the common link parameter setting, change the common link parameter setting and the unique link parameter set before the link device expansion. By automatically checking and inputting the start address and size of the link device reception area for the changed part as a new unique link parameter from the peripheral device, linking is performed without changing the reception area address of each station. Expand your device.

In the link device expansion method according to the present invention, the contents of common link parameters set by the management station that are the same for all stations and station-specific link parameters that are set for each station and that determine the link device reception area of the station itself. In order to extend the link device reception area of a certain station when executing data link based on, the common link parameter and the unique link parameter set before the link device extension are changed. Are automatically checked, and the link device reception area for the changed part is set to its start address, station order,
By inputting the size as a new unique link parameter from the peripheral device and setting it in each station, the link device is expanded without changing the address of the receiving area of each station.

Furthermore, the link device transfer method according to the present invention is a station-specific unique link which is set by the management station and determines the link device reception area of the own station which is set in common for all stations and has a plurality of common link parameters set for each station. By transferring the link device to the receiving area of each station based on the setting contents of each parameter, the address of the link device receiving area before expansion does not change, so it was created and used by each station until then. The sequence program can be reused, and only the extended part is created and added.

[0033]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, the same reference numerals as those of the conventional example indicate the same or equivalent functional elements as those of the conventional example, and the description thereof will be omitted. The configuration of the programmable controller as the data link device is also the same as that of the conventional example, and the description thereof is omitted here.

FIG. 2 shows a first embodiment of the present invention,
It is explanatory drawing which shows the internal structure of a peculiar link parameter, and its setting example, and has shown an example of the setting content in the system structure as shown in FIG. In FIG. 2, 4 is the head address of the link device received at each station, 5 is the size of the link device, and 15 is the machine number set by the common link parameter. Is shown. The peculiar link parameters in the first embodiment are the start address 4 and the size 5 of the link device from the peripheral device 14 to the machine No. for each station. It is set by inputting in the order of 15.

FIG. 4 is an explanatory diagram showing a reception state in each station before the link device expansion in the first embodiment. That is, FIG. 4 constructs a data link from the common link parameters set according to the contents shown in FIG. 14 and the unique link parameters set according to the contents shown in FIG. 2, and sets the link device to the reception area of each station. It shows the state of transfer. In FIG. 4, 1 is a common link parameter, 2 is a unique link parameter, and 3 is a state in which each station actually receives a link device. The arrows in the figure show the operation of the link device to be transferred.

Next, the setting content of the unique link parameter 2 and its operation will be described. Since the station order is not set with the unique link parameter 2 unlike the conventional example, the unit number of the common link parameter 1 set by the management station MPC12 is set. The link device is transferred to the reception area with the start address 4 and size 5 set in order corresponding to 15. Therefore, in this setting, the link device with the station number 1 set by the common link device 1 is transferred from the address 0 to the size 20, that is, the receiving area with the address 19, and similarly, the link device with the station number 2 is moved to the address 20.
To the receiving area of address 39, the link device of station number 3 is transferred from address 40 to address 69 by the operation indicated by the arrow.

Next, a processing method for expanding the link device received by each station will be described. FIG. 1 is an explanatory diagram showing a reception state of each station when a link device is expanded, showing a first embodiment and a third embodiment (described later). Further, FIG. 3 is an explanatory diagram showing the setting content of the unique link parameter newly set when the link device is expanded in the first embodiment. Further, in FIG. 1, the size of the link device of the NPC 13 of the first station is expanded by 10 in the state of being set by the common link parameter 1 and the unique link parameter 2 having the contents as described in FIG. The change of the receiving area in each station in the case is shown.

In FIG. 1, the shaded area is the newly expanded link device of the first NPC 13. Reference numeral 2'denotes a unique link parameter which is newly set and added to the link device extended portion with the contents shown in FIG. Further, 3'represents the reception state of each station before the expansion of the link device, and is supplementarily shown so as to be easily compared with the state 3 after the expansion.

Next, the operation of setting the unique link parameter 2'will be described. FIG. 5 is a flowchart showing the setting process of the unique link parameter shown in FIG. First, the MPC 12 changes the setting of the common link parameter 1. To increase the size of the link device of the first NPC 13 by 10, the common link parameter 1
Respectively, the addresses of the first NPC 13 are 0 to 2
The addresses of the NPC 13 of the 9th and 2nd stations are set to 30 to 49, the addresses of the NPC 13 of the 3rd station are set to 50 to 79, and in the NPC 13 of the 2nd and 3rd stations, compared to the original setting of the common link parameter 1, The start address is deviated by 10 which is the extension of the first station.

Subsequently, the setting of the unique link parameter 2 is executed on the side of each station. This setting will be described with reference to the flowchart shown in FIG. First, it is determined whether the setting target is the expanded link device portion (S1). When setting again the link device that has been set before expansion, the start address and size are input from the setting of the unique link parameter 2. On the contrary, when the link device set by the unique link parameter 2 before the expansion is left as it is and only the newly expanded part is set, that is, the target to be set in step 1 is the expanded link device part. When it is determined that there is such a change, the changed part is automatically checked by the changed common link parameter 1 and the unique link parameter 2 that has been set in the past (S2).

Further, it is judged from the check result of the above step 2 whether or not there is a size remaining (S3). Explaining this with the example shown in FIG. 1, the size setting of the NPC 13 of the first station, which is the changed part, is 30 for the common link parameter 1 and 20 for the unique link parameter 2, so the two are compared. Then, there are 10 remaining sizes that can be set as the unique link parameter 2 '. Therefore, when it is determined in step 3 that there is no remaining size, the unique link parameter 2'cannot be newly set, and the present setting process is ended. On the contrary, when it is determined that there is a remaining size, as in the example shown in FIG. 1, the unique link parameter 2 ′ is newly set using the remaining size.

The new setting of the unique link parameter 2'is similar to the unique link parameter 2 set before the expansion of the link device, the start address of the reception area is input in the station order (S4), and the size is further input. Do (S
5). After that, the change processing is internally executed (S6), the station is incremented by one (station + 1) (S7), and it is determined whether all stations are completed (S8).
If it is determined that all stations have not been completed, the process returns to step 4, and this process is repeatedly executed until the setting of all stations is completed.

In the example shown in FIG. 1, for the link device extended to the NPC 13 of the first station as the unique link parameter 2 ', the size from the head address 70 to the size 1
The receiving area is set to 0, and NPC1 of the second and third stations
As for 3, there was no change in the link device, so
Not set.

Therefore, if the unique link parameter 2'is newly set in each station by the above method, as shown in FIG. 1, the reception state 3'in each station before the link device expansion and the link device after the link device expansion are shown. As is clear from comparison with the reception state 3 in each station, the link device can be expanded while the address in the reception area of each station remains unchanged.

The effects of the first embodiment described above can be summarized as follows: in order to expand the link device that can be received by each station, even if the common link parameter set by the management station MPC12 is changed, the common link parameter and conventional Automatically checks the changed part from the peculiar link parameters that have already been set, and as a result, only the link device of the changed part is newly set as the peculiar link parameter from the peripheral device 14 by inputting the start address and size. By providing such means, the link device can be expanded without changing the address of the reception area of each station.

[Second Embodiment] Next, a second embodiment will be described. FIG. 6 is an explanatory diagram showing an example of the internal configuration and setting contents of the unique link parameter according to the second embodiment. In the figure, 6 is the start address of the receiving area set first in the unique link parameter 2, 7 is the order of receiving stations, and 8 is the size of the link device. The unique link parameters in the second embodiment are set by inputting these elements from the peripheral device 14 for each station.

FIG. 8 is an explanatory diagram showing a reception state in each station before the link device expansion according to the second embodiment.
That is, in FIG. 8, a data link is constructed from the common link parameter set with the contents shown in FIG. 14 and the unique link parameter set with the contents shown in FIG. 6, and the link device is received by each station. This shows the state of transfer to the area. In FIG. 8, 1 is a common link parameter, 2 is a unique link parameter, and 3 is a state in which each station actually receives a link device. Further, the arrows in the figure show the operation of the transferred link device.

Next, the setting content of the unique link parameter and its operation will be described. The link device of the NPC 13 of the first station set by the common link parameter 1 is set to the first station number by the unique link parameter 2, so the start address starts from 0 and is transferred to the reception area with size 20. It Next, the NPC of the third station whose station order is set second by the unique link parameter 2
The 13 link devices are transferred with a size of 30 to the reception area after the NPC 13 in the first received first station. At this time, the start address of the reception area of the third station is not set in the unique link parameter 2,
Since the reception area of the first station has a size of 20 from the start address 0, the reception area from the address 20 is set. Similarly, the link device of the second NPC 13 whose station order is set to the third by the unique link parameter 2 is the receiving area of the addresses 50 to 69 which is the receiving area after the NPC 13 in the third station. Transferred to.

Next, a processing method for expanding the link device received by each station will be described. FIG. 9 is an explanatory diagram showing the reception state of each station when the link device is expanded, showing the second and third embodiments (described later).
Further, FIG. 7 is an explanatory diagram showing the setting contents of the unique link parameters newly set when the link device is expanded in the second embodiment. Further, FIG. 9 shows that the size of the link device of the first NPC 13 is 10 when the data link set by the common link parameter 1 and the unique link parameter 2 having the contents described in FIG. 8 is constructed. The change in the reception area at each station when expanded is shown.

In FIG. 9, the shaded area is the newly expanded link device of the first NPC 13. Further, 2'is a unique link parameter newly set and added with respect to the link device extension part as shown in FIG. 7, and 3'represents a reception state in each station before the link device extension, and after the extension. It is supplementarily shown so as to be easily compared with the state 3.

Next, the operation up to setting the unique link parameter 2'will be described. FIG. 10 is a flowchart showing the setting process of the unique link parameter shown in FIG. Here, first, the setting of the common link parameter 1 is changed in the MPC 12. In order to expand the size of the link device of the NPC 13 of the first station by 10, the common link parameter 1 is such that the address of the NPC 13 of the first station is 0 to 29 and the address of the NPC 13 of the second station is 30 respectively.
˜49, the address of the NPC 13 of the 3rd station is set to 50 to 79. In the NPC 13 of the 2nd and 3rd stations, the start address is 10 increments, which is the extension of the 1st station, compared to the setting of the original common link parameter. It shifts.

Then, each station sets the unique link parameter 2. Hereinafter, description will be given based on the flowchart shown in FIG. First, it is determined whether or not the setting target is only the change of the extended link device portion (S9). At this time, when the link device that has been set before the expansion is set again, the start address and the size are input from the setting of the unique link parameter 2. On the contrary, when the link device set by the unique link parameter 2 before the expansion is left as it is and only the newly expanded part is set, that is, the target of the setting in step 9 is only the expanded link device part. When it is determined that the change is made, the changed part is automatically checked by the changed common link parameter 1 and the peculiar link parameter 2 that has been set conventionally (S10).

Then, it is judged from the result of the above step 10 whether or not there is a size remaining (S11). Explaining this operation using the example shown in FIG. 9, the size setting of the NPC 13 of the first station, which is the changed part, is 30 for the common link parameter 1 and 20 for the unique link parameter 2. When there is a comparison, there are 10 remaining sizes that can be set as the unique link parameter 2 ′. Therefore, if it is determined in step 11 that there is no remaining size, the unique link parameter 2'cannot be newly set, and thus this setting process is directly terminated. On the other hand, when it is determined that there is a remaining size, as in the example shown in FIG. 9, the unique size is set to a new unique link parameter 2 ′.

The new setting of the unique link parameter 2'is the same as the unique link parameter 2 set before the expansion of the link device. First, the unique link parameter 2'is set.
The start address of the station whose station order is set first is input (S12), then the station order to transfer the link device is input (S13), and the size is also input (S14). After that, the change process is executed internally (S15), and it is determined whether all stations are completed (S15).
16). If it is determined that all stations have not been completed, the process returns to step 13 and this process is repeatedly executed until the setting is completed for all the stations to be set. Then, when all stations are completed, the setting of the unique link parameter 2'is completed.

In the example shown in FIG. 9, for the extended link device of the NPC 13 of the first station as the unique link parameter 2 ', the reception area of the size 10 from the head address 70 in the station order 1 is selected. I have set 2,
The NPC 13 of the third station is not set because the link device has not been changed.

Therefore, if the unique link parameter 2'is newly set in each station by the above method, as shown in FIG. 9, the reception state 3'of each station before the link device expansion and the link device after the link device expansion are performed, as shown in FIG. As is clear from the comparison of the reception states 3 of the stations, the link device can be expanded while the addresses in the reception areas of the stations remain unchanged.

The effects of the second embodiment described above can be summarized as follows: in order to expand the link device that can be received by each station, even if the common link parameter set in the management station MPC12 is changed, the common link parameter and the conventional Automatically checks the changed part from the peculiar link parameters already set from, and as a result, the start address, station order, and size are newly input from the peripheral device 14 as the peculiar link parameter only for the changed link device. By providing the setting means, the link device can be expanded without changing the address of the reception area of each station.

[Third Embodiment] Next, a third embodiment will be described with reference to FIGS. 1 and 7 for explaining the first and second embodiments. In FIG. 1, thin solid arrows respectively indicate the operation of link device transfer to each station by the unique link parameter 2 set before the link device expansion. On the other hand, the thick solid arrow indicates the unique link parameter 2'which is newly set after the link device expansion.
Shows the operation of link device transfer to each station by.

When the link device is expanded, in addition to the unique link parameter 2 set before the expansion of the link device, the method described in the first and second embodiments is used.
In order to receive the extended link device, the reception area of each station is newly set as the unique link parameter 2 '. In each station, the link device that has been transmitted to itself is received from the receiving area set by the common link parameter 1, only the setting of the unique link parameter 2, and therefore each operation is performed by the operation indicated by the thin solid arrow. Although it was received by transferring the link device to the area, by newly setting the unique link parameter 2 ′, the link device that was set before the link device expansion is still as it is, according to the unique link parameter 2, Transfer to each reception area by the operation like a thin arrow. Then, for the extended link device, according to the unique link parameter 2 ′,
The link device is transferred to each reception area and received by the operation indicated by the thick arrow.

FIG. 11 is a flowchart showing the link device transfer processing according to the third embodiment described above. In the figure, first, the link device transmitted from another station is transferred to the reception area set by the common link parameter (S17). Then, it is determined whether or not the unique link parameter is set (S18).
As a result, when it is determined that the unique link parameter is not set, the link device is received as it is in the reception area set by the common link parameter (S21), and this processing is ended. On the contrary, when it is determined in step 18 that the unique link parameter is set, the link device is transferred from the receiving area set by the common link parameter to the receiving area set by the unique link parameter (S1).
9).

Next, it is determined whether or not the added unique link parameter is set (S20). At this time, when it is determined that the added unique link parameter is set, the link device is similarly transferred from the common link parameter receiving area to the unique link parameter receiving area based on the setting of the unique link parameter ( S19). This operation is executed for the set unique link parameters, and when all the unique link parameters are completed, the link device is received in the transferred reception area by the setting of each unique link parameter (S21), and this processing is executed. To finish.

As described above, by transferring the link device transmitted to the own station to each reception area based on the setting contents of the plurality of unique link parameters, each station can obtain the address in the reception area of its own station. Even if the link device is expanded, it is unchanged from the state before expansion.

FIG. 12 is a sequence program in each station after the link device expansion in the third embodiment. That is, FIG. 12 shows a sequence program of each station which is data-linked by the transfer method as described above after expanding the link device as shown in FIG. 1 or FIG. In the figure, 9 is the first NPC
The program of 13 shows the program of the NPC 13 of the second station, the 11 shows the program of the NPC 13 of the third station, and the part surrounded by the broken line is the part different from the program before the link device expansion (see FIG. 20). .

As described above, according to the link device transfer method according to the third embodiment, since the address of the reception area remains unchanged, the sequence is transferred using the link device which is transferred to and received. At each station that has created a program and is performing data link processing, it is possible to reuse the sequence program that was used before the expansion of the link device, and only add the program for the added link device. become.

Therefore, in FIG. 12, only the B20, which has been expanded to become the link device of the NPC 13 of the first station, is added to the sequence program before the expansion of the link device (see FIG. 20). Is the same as the sequence program shown in FIG. 20, because the address of the receiving area is unchanged unless new processing is added.

As a summary of the effects of the third embodiment described above, even if the link device received at each station is expanded, in addition to the unique link parameters set before the expansion of the link device, By newly setting the reception area of the extended portion as a unique link parameter for each station by the method as shown in the first and second embodiments, the link device is based on both the conventional unique link parameter and the conventional unique link parameter. Is transferred to the receiving area of each station, and the address of the link device receiving area before expansion remains unchanged.Therefore, the sequence programs created and used by each station up to that point can be reused as they are and expanded. Since it suffices to create only the part and add it, a sequence is required every time the link device is expanded. The scan program it is possible to eliminate the burden that has been modified all. Therefore, the work efficiency of creating the sequence program is improved.

[0067]

As described above, according to the link device expansion method of the present invention, when the common link parameter set by the management station and common to all stations is changed, the link device of each station is automatically expanded. Check the changed part, and set a plurality of station-specific unique link parameters that are set for each station and that determine the link device reception area of its own station, corresponding to the changed part, from the peripheral device. Since the link device is expanded by doing so, even when the setting contents in the common link parameter are changed when expanding the link device of each station, the station of each station that transfers the link device does not change the communication procedure to each station. The link device can be expanded without changing the address of the receiving area of the link device, resulting in greater work efficiency. To improve on.

Further, according to the link device transfer method of the present invention, a common station is set by the management station and common to all stations. Since the link device is transferred to each reception area based on the setting of each unique link parameter, the sequence program that has been used up to now can be used as it is, only the changed part needs to be added, and work efficiency is improved. Improve dramatically.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a reception state of each station when a link device according to the present invention is expanded.

FIG. 2 is an explanatory diagram showing an internal configuration of a unique link parameter according to the present invention and a setting example thereof.

FIG. 3 is an explanatory diagram showing the setting contents of unique link parameters newly set at the time of expanding the link device according to the present invention.

FIG. 4 is an explanatory diagram showing a reception state in each station before the link device expansion according to the present invention.

5 is a flowchart showing a setting processing operation of the unique link parameter shown in FIG.

FIG. 6 is an explanatory diagram showing an example of an internal configuration and setting contents of a unique link parameter according to the present invention.

FIG. 7 is an explanatory diagram showing setting contents of unique link parameters newly set at the time of expanding the link device according to the present invention.

FIG. 8 is an explanatory diagram showing a reception state of each station before the link device expansion according to the present invention.

FIG. 9 is an explanatory diagram showing a reception state of each station when the link device according to the present invention is expanded.

10 is a flowchart showing a setting processing operation of the unique link parameter shown in FIG.

FIG. 11 is a flowchart showing a link device transfer processing operation of the present invention.

FIG. 12 is an explanatory diagram showing a sequence program in each station after the link device expansion according to the present invention.

FIG. 13 is an explanatory diagram showing a schematic configuration of a conventional data link system.

FIG. 14 is an explanatory diagram showing a conventional internal configuration of a common link parameter and a setting example thereof.

FIG. 15 is an explanatory diagram showing a conventional internal structure of a unique link parameter and a setting example thereof.

FIG. 16 is an explanatory diagram showing a reception state in each station when data linking is performed without setting a unique link parameter in the related art.

FIG. 17 is an explanatory diagram showing a reception state of each station according to a conventional unique link parameter.

FIG. 18 is a flowchart showing a conventional link device receiving method of each station.

FIG. 19 is an explanatory diagram showing a reception state in each station when a link device is expanded in the related art.

20 is an explanatory diagram showing a sequence program used in each station in the state shown in FIG.

21 is an explanatory diagram showing a sequence program obtained by modifying the sequence program shown in FIG. 20 in each station in the state shown in FIG.

[Explanation of symbols]

 1 Common link parameter 2 Unique link parameter before link device expansion 2'Unique link parameter after link device expansion 4,6 Start address 5,8 Size 7 Station order 12 Management station (programmable controller: MPC) 13 Normal station (programmable controller : NPC) 14 peripheral devices

Claims (3)

[Claims] 1. A data link is executed based on the contents of a common link parameter set by the management station that is the same for all stations and a unique link parameter that is set for each station and that determines the link device reception area of the station itself. In this case, in order to extend the link device reception area of a certain station, after changing the setting of the common link parameter, the common link parameter and the unique link parameter set before the link device extension are automatically set. A method for expanding a link device, which comprises checking and setting the start address and size of the link device receiving area for the changed part as a new unique link parameter from a peripheral device and setting it to each station. 2. The data link is executed based on the contents of a common link parameter set by the management station that is the same for all stations and a unique link parameter that is set for each station and that determines the link device reception area of the station itself. In this case, in order to extend the link device reception area of a certain station, after changing the setting of the common link parameter, the common link parameter and the unique link parameter set before the link device extension are automatically set. A method for expanding a link device characterized in that the link device reception area for the changed portion is checked and the start address, station order, and size are arbitrarily input from the peripheral device as new unique link parameters and set to each station. . 3. A common link parameter that is set by the management station and is the same for all stations, and a plurality of unique link parameters that are unique to each station and that determine the link device reception area of the local station are set for each station. Then, the link device is transferred to each reception area.