JPH0460813A - Numerical controller - Google Patents

Abstract

PURPOSE:To continue the operation of input/output (I/O) controllers other than a faulty I/O controller to prevent the reduction of the operating ratio of a control object by by-passing the faulty I/O controller to communicate data in the case of the occurrence of trouble in one or plural I/O controllers. CONSTITUTION:If trouble occurs in a communication part 7 of an I/O control unit (for example, 3b), this unit 3b sends an error detection command. A control main body part 1 (master station) outputs a communication line switching signal when receiving the error detection command, and a communication line switching part 10c receives this signal and disconnects the I/O control unit 3b from a a communication network to by-pass this unit. A CPU 5 of the control main body part 1 substitutes input data of the I/O control unit 3b with data preliminarily held in an operation data holding part 11 and continues to control the other I/O control objects 4a and 4c. Thus, functions except in the trouble position are continuously operated though trouble occurs in the communication network.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a control device main body that outputs control commands,
A number of stages of input/output control devices are connected to the control device main body via a loop communication network and control input/output control targets based on control commands from the control device main body, and the control device main body and the input/output control device This invention relates to a numerical control device that performs data communication between devices.

[Conventional technology] Today, one master station (control device main body) and multiple slave stations (input/output control devices) are used for the purpose of functional decentralization and wiring-saving connections between the control device main body and input/output control targets. It is popular in the field of numerical control devices, etc., to form a loop communication network and perform control while performing one-to-many pig communication.

As shown in FIG. 6, the numerical control device has a control main unit 1 as a master station, and the control main unit 1 has a communication path 2a.
, 2b, 2c, 2d via the input/output control unit 3a,
3b and 3c are connected, and the input/output control unit 3a
, 3b, 3c have input/output control targets 4a, 4b,
4c is connected.

The control main unit 1 includes a CPU 5 and a communication unit 6, and the input/output control units 3a, 3El, and 3c each include an i unit 7 and an input/output interface 8.

In addition, the control main unit 1 or the input/output control units 3a, 3
The frames of the signals outputted from the signals b and 3c have a format as shown in FIG.

Next, the operation will be explained.

Control main unit 1 and input/output control units 3a and 3b.

3C, the data shown in FIG. 4(a) is sent from the control main unit 1 to the communication path 2a.

When the input/output control unit 3a receives the data frame sent to the communication path 2a, the input/output control unit 3a writes the data addressed to the slave station 1 from the master station to the input/output interface 8, and also reads the data from the input/output interface 8. The state of the input control target is rewritten from the slave station 1 to the data addressed to the master station, and the data frame in FIG. 4 (1)) is transferred to the communication path 2b.
Send to.

Then, upon receiving the data frame sent to the communication path 2b, the input/output control unit 3b writes the data addressed to the slave station 2 from the master station to the input/output interface 8, and also reads the data from the input/output interface 8. The state of the input control object is rewritten from the slave station 2 to the data addressed to the master station, and the data frame in FIG. 4(c) is transferred to the communication path 2c.
Send to.

Furthermore, upon receiving the data frame sent to the communication path 2c, the input/output control unit 3c writes the data addressed to the slave station 3 from the master station to the input/output interface 8, and also reads the data from the input/output interface 8. The state of the input control object is rewritten from the slave station 3 to data addressed to the master station, and the data frame shown in FIG. 4(d) is sent to the communication path 2d.

In this way, from the control main unit 1 to the input/output control unit 3a
, 3b, 3c, the data frame output as output data to the controlled objects connected to the input/output control units 3a, 3b, 3c is rewritten into input data indicating the status of each input/output controlled object. and returns to the control main body section 1.

The control main unit 1 then controls input/output control objects through the loop communication network described above, and operates a desired machine.

Furthermore, if the communication section 7 of the control unit that is the slave station fails, data from the control main body section 1 that is the master station cannot be transmitted to each input/output control unit 3a, 3b, and 3c.

The control unit in which the communication section 7 has failed is unable to start its operation and remains in a state of waiting to receive data, and after a predetermined period of time has elapsed, sends out an error detection command as shown in FIG.

This error detection command is sent to the control main unit 1 via each input/output control unit, and informs the main body 1 that a failure has occurred and the location where the failure has occurred.

When the control main unit 1 receives the error detection command, it stops the operation of the controlled object and displays the location where the failure has occurred as a message.

[Problems to be Solved by the Invention] Since the conventional numerical control device is configured as described above, when a failure occurs in the communication section 7 of the input/output control unit, the failure location can be identified by a message. However, since it is not possible to operate all the controlled objects until the cause of the failure is removed, there is a problem in that the operating rate of the controlled objects decreases. Additionally, mechanical operations required for repair (e.g., where axis movement is required to access the installation location of the input/output control unit) are no longer possible;
There was a problem that a deadlock situation could occur.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a numerical control device that can continue to operate functions other than those where the failure has occurred even if a failure occurs in the communication network. Our goal is to provide the following.

[Means for Solving the Problems] A numerical control device according to the present invention includes a control device main body that has a CPU and outputs control commands, and a control device main body that is connected to the control device main body via a loop communication network and that is connected to the control device main body and that outputs control commands. a plurality of input/output control devices that control input/output control targets based on control commands; bypass means provided in a loop communication network to bypass the input/output control devices; and bypass means provided in the control device main body to bypass the input/output control devices. and an operation data holding unit that replaces input data to be transmitted from the input/output control device with data held in advance. Therefore, the CPU is characterized in that, when a failure occurs in one or more input/output control devices, data communication is performed by bypassing the failed input/output control device using bypass means.

Further, it is preferable to include a changing means that can arbitrarily change the data held by the operation data holding section.

[Operation] The numerical control device according to the present invention outputs control commands from the control device main body, and performs control based on the control commands from the control device main body by a plurality of input/output control devices connected to the control device main body via a loop communication network. The CPU controls input/output control targets, and when a failure occurs in one or more input/output control devices, the CPU disconnects the failed input/output control device from the loop communication network using the bypass means, and disconnects the disconnected input/output Replaces the manual data of the control device with data previously stored in the operation data storage unit, and replaces the input/output where the failure occurred
Data communication is performed by hyper-passing the 1ilJ control device using bypass means.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a numerical control device according to the present invention. It consists of

A communication path switching section 10a is connected to the communication section 6, and the communication path switching section 1. Ob is connected.

Further, an input/output control unit 3a as an input/output control device is connected to the communication path switching unit 10b, an input/output control target 4a is connected to the input/output control unit 3a, and the input/output control unit t. 3a consists of a communication section 7 and an input/output interface 8.

Further, a communication path switching unit 10c is connected to the communication path switching unit 10b via a communication path 2b.
The input/output control unit 3b is connected to the input/output control unit 3b.

The input/output control unit 3b has an input/output control target 4.
b is connected, and the input/output control unit 3b consists of a communication section 7 and an input/output interface 8.

Further, a communication path switching unit 10d is connected to the communication path switching unit 10c via a communication path 2c.
An input/output control unit 3c is connected to cl.

The input/output control unit 3c has an input/output control target 4.
c is connected, input/output R1! The I control unit 3c consists of a communication section 7 and an input/output interface 8.

Further, the communication path switching unit 10d is connected to the communication path switching unit 10a via a communication path 2d.

On the other hand, the CPU 5 of the control main unit 1 includes an operation data holding unit 1 which replaces human power data sent from the input/output control unit with data held in advance when bypassing.
and a communication channel control section 12 are connected to each communication channel switching section 10a, ]Ob, 10c, 10.
d is connected.

An operation panel interface 13 is connected to the operation data holding section 1], and the operation data holding section]1,
Communication path control unit] 2 and operation panel interface 13
The input data control section 14 is configured by the following.

Further, an operation panel 5 is connected to the operation panel interface 13 as a changing means that can arbitrarily change the data held by the operation data holding section 11.

Further, communication path switching units 10a, 10b, and 10c.

10d (for example, 10b) has a control relay coil 16 as shown in FIG.
Normally closed contacts 17 and 18 of the control relay are arranged on the transmission line 2b on the receiving side and the transmission line 2b on the transmitting side, respectively, and a normally open contact 1 of the control relay is arranged between the transmission line 2a on the receiving side and the transmission line 2b on the transmitting side. is placed.

Next, the operation of this embodiment will be explained.

Control main unit 1 and input/output control units 3a and 3b.

3C, the data shown in FIG. 4(a) is sent from the control main unit 1 to the communication path 2a.

When the input/output control unit 3a receives the data frame sent to the communication path 2a, the input/output control unit 3a writes the data addressed to the slave station 1 from the master station to the input/output interface 8, and also reads the data from the input/output interface 8. The state of the input control object is rewritten from the slave station 1 to data addressed to the master station, and the data frame shown in FIG. 4(b) is sent to the communication path 2b.

Then, upon receiving the data frame sent to the communication path 2b, the input/output control unit 3b writes the data addressed to the slave station 2 from the master station to the input/output interface 8, and also reads the data from the input/output interface 8. The state of the input control object is rewritten from the slave station 2 to the data addressed to the master station, and the data frame in FIG. 4(c) is transferred to the communication path 2c.
Send to.

Furthermore, upon receiving the data frame sent to the communication path 2c, the input/output control unit 3c writes data destined for the slave station 3 from the master station to the input/output interface 8, and also reads the data from the input/output interface 8. The state of the input control object is rewritten from the slave station 3 to data addressed to the master station, and the data frame shown in FIG. 4(d) is sent to the communication path 2d.

In this way, from the control main unit 1 to the input/output control unit 3a
, 3b, 3c, the data frame output as output data to the controlled objects connected to the input/output control units 3a, 3b, 3c is rewritten into input data indicating the status of each input/output controlled object. and returns to the control main body section 1.

The control main unit 1 controls input/output control objects through the loop communication network described above, and operates a desired machine.

Next, a case where a failure occurs will be explained along the flowchart of FIG. 3.

A failure occurs in the communication unit 7 of the input/output control unit (for example, 3b), and in step S1), the input/output control target (4b) connected to the input/output control unit (3b) in which the failure has occurred
) is the same as other input/output control units (3a, 3c)
) connected to the input/output control target (4a, 4c), the input/output control unit (3b) continues to wait for data reception from the control main unit 1, and after a predetermined period of time, the input/output control unit (3b) fails. It is determined that an error has occurred, and an error detection command as shown in FIG. 5 is sent.

This error detection command is sent to the control main body section 1 via each input/output control unit, and informs that a failure has occurred and the location where the failure has occurred (step S2).

When the control body section 1 receives the error detection command, the control main body section 1 outputs a communication channel switching signal from the communication channel control section 12 to the communication channel switching section 10c.

A communication path switching unit 10c receives the communication path switching signal.
In step S3, the control relay coil 16 is turned ON, the normally closed contacts 17 and 18 of the control relay are opened to disconnect the input/output control unit (3b) from the communication network, and the normally open contact 19 of the control relay is closed to bypass the control relay. ).

Then, the CPU 5 of the control main body section 1 detects that the input data of the input/output control target (4b) of the data frame returning to the control main body section 1 has not been transmitted, and the CPU 5 of the control main body section 1 detects that the input data of the input/output control target (4b) of the data frame returning to the control main body section 1 has not been transmitted. The input/output control unit (3b) is replaced with input data of the input/output control unit (3b) (step S4), and the input/output control unit (3b) is clearly indicated on the operation panel 15 as the input data of the input/output control unit (3b). , 4c) continues (step S5).
).

It should be noted that the data held in the operation data holding section 1 is input data to the input/output control unit I-(3b), and is set to a value that is normal for continuing control.

In addition, a failure occurs in the communication section 7 of the input/output control unit (for example, 3b), and the input/output control unit (3b) in which the failure occurs
If the state of the input/output controlled object (4b) connected to b) is related to the control of the input/output controlled object (4a, 4c) connected to other input/output control units (3a 3c), the input/output The control unit (3b) continues to wait for reception of the pig from the control main unit 1, and after a predetermined period of time has elapsed, determines that a failure has occurred and sends out an error detection command as shown in FIG.

This error detection command is sent to the control main unit 1 via each input/output control unit, and informs the control body 1 that a failure has occurred and the location where the failure has occurred.

Upon receiving the error detection command, the main control unit outputs a communication path switching signal from the communication path control unit 12 to the communication path switching unit 10c.

A communication path switching unit 10c receives the communication path switching signal.
is the control relay coil] 6 ONL, the control relay's normal close contact 1.7.18 is opened to disconnect the input/output control unit 1-(3b) from the communication network, and the control relay's normal oven contact] 9 is closed. bypass.

Then, the CPU 5 of the control main unit 1 controls the operation panel 15.
A message is displayed indicating that an abnormality has occurred in the input/output control unit (3b), and the operation of the other input/output control objects (4a, 4c) is stopped.

Then, the operator uses the operation panel 15 to check the input state of the human power control unit (3b) that is disconnected from the communication network, or the data that will not cause an interlock in controlling the input/output control unit related to the desired machine operation. Set the value.

Note that the data set using the operation panel [5] is transferred to the operation data holding unit via the operation panel interface [3].
Written to 1.

Furthermore, when the operator performs a desired machine operation, ] 6 The CPU 5 of the control main unit 1 transmits the human power data of the input/output control unit (3b) disconnected from the communication network to the operation panel 1.
5 and is replaced with the data set in the operation data holding section 11.

Note that if the present invention is used during assembly when a part of the input/output control unit is not yet mounted, it is possible to adjust the functions of the input/output control unit that is already mounted.

[Effects of the Invention] As explained above, according to the present invention, when a failure occurs in one or more input/output control devices, the configuration is configured to bypass the failed input/output control device and perform pig communication. Therefore, it is possible to continue the operation of the input/output control devices other than the failed input/output control device, thereby preventing the operating rate of the controlled objects from decreasing.

In addition, we have provided a change means that can arbitrarily change the data held by the operation data holding unit, so that the input data of the input/output control device that is disconnected from the communication network can be changed arbitrarily and the machine required for repair can be changed. Operations can be performed on the container.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a numerical control device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing the configuration of a communication switching section, and FIG. 3 is a flowchart 1 diagram showing the operation of the present invention. , FIG. 4 and FIG. 5 are diagrams showing data frames, and FIG. 6 is a block diagram showing the configuration of a conventional numerical control device. 1... Control main body parts 3a, 3b, 3c... Input/output control unit 4a
, 4b, 4c ・I/O control target 5... CP
U 10a, 10b, 10c, 10d... Communication path switching unit 11... Operation data holding unit] 5... Operation panel

Claims (2)

[Claims] (1) A control device main body that has a CPU and outputs control commands, and a plurality of inputs that are connected to the control device main body via a loop communication network and control input/output control targets based on control commands from the control device main body. an output control device;
In a numerical control device that performs data communication between a control device main body and an input/output control device, a bypass means provided in the loop communication network to bypass the input/output control device, and a bypass means provided in the control device main body. an operation data holding unit that replaces input data to be transmitted from an input/output control device to be bypassed by data held in advance; In this case, a numerical control device is characterized in that data communication is performed by bypassing a failed input/output control device using bypass means. (2) The numerical control device according to claim (1), further comprising changing means capable of arbitrarily changing the data held by the operation data holding section.