JPH0711080U - Supervisory control system - Google Patents

Abstract

(57) [Summary] [Configuration] The main transmission line 3a and the sub transmission line 3b of the supervisory control system are composed of the first and second main signal lines 4a and 4b and the first and second sub signal lines 5a and 5b. Each is formed. Further, the master station 1 and the slave stations 2 ... Have data output means for outputting the same data to the first and second main signal lines 4a and 4b or the first and second sub signal lines 5a and 5b, and the first and second It has a data judging means for comparing the data inputted from the second main signal lines 4a, 4b or the first and second sub signal lines 5a, 5b to judge the correctness of the data. [Effect] Data transmission due to erroneous data can be prevented in the master station 1 and the slave stations 2, so that the reliability of the entire system can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a supervisory control system used for supervising and controlling facility equipment installed in buildings and various plants.

[0002]

[Prior art]

 For modernized factories and facilities such as plants, it is necessary to operate the equipment distributed in multiple locations in cooperation with each other in order to realize smooth operation. Therefore, it is desirable that all the above facility equipment can be controlled from this particular location while the operating status can be monitored at a particular location. Normally, these monitoring and control are performed by all facility equipment and centralized monitoring. It is designed to be performed by a supervisory control system that sends and receives operation data and control data to and from the control device.

As shown in FIG. 2, a conventional supervisory control system uses the above-mentioned supervisory control device for central management as a master station 51 and directly monitors and controls facility equipments arranged at various places. The side control device is a slave station 52, and these master station 51 and slave stations 52 are connected in a loop via a transmission line 53.

Further, in the conventional supervisory control system, the transmission line 53 is duplicated by the main signal line 53a and the auxiliary signal line 53b so that data transmission in the opposite direction is possible on both the signal lines 53a and 53b. There is. As a result, the conventional supervisory control system enables the data transmission to be continued by using the other auxiliary signal line 53b even when one of the main signal lines 53a becomes in a state where the data transmission cannot be performed due to the disconnection or the like. As a result, the reliability of the entire system is improved.

[0005]

[Problems to be solved by the device]

 By the way, the data on the transmission line 53 may be erroneous due to noise, for example, even if the transmission line 53 is functioning normally. Therefore, in order to improve the reliability of the entire system, it is necessary to be able to immediately recover normal data when an error occurs in the data. However, in the above-mentioned conventional supervisory control system, since no measures are taken when an error occurs in the data, incorrect data is sequentially transmitted to the slave stations 52, and the reliability is lowered. It has become a thing.

Therefore, it is an object of the present invention to provide a supervisory control system capable of detecting an error in data and immediately recovering it to normal data.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the supervisory control system of the present invention connects a plurality of control devices in a loop by a main transmission line and a sub transmission line to perform data transmission, and has the following features. ing.

That is, the main transmission line and the sub transmission line are respectively formed by a plurality of signal lines. Further, the control device outputs the same data to all the signal lines of the main transmission line or the sub-transmission line and the data input from all the signal lines of the main transmission line or the sub-transmission line. And a data judging means for comparing and judging whether the data is correct or not.

[0009]

[Action]

 According to the above configuration, even if an error occurs in the data, the data input from all the signal lines of the main transmission line or the sub transmission line are compared with each other to determine whether the data is correct or incorrect. An error in the data will be detected by the control device that received the data. Therefore, it is possible to prevent data transmission due to erroneous data in each control device, and as a result, it is possible to improve the reliability of the entire system.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 1, the monitoring control system according to the present embodiment directly monitors and controls a master station 1 which is a control device for central management and facility equipment arranged at various places. .., which are field side control devices, are connected in a loop shape via a main transmission line 3a and a sub transmission line 3b. The above-mentioned main transmission line 3a and sub-transmission line 3b have a signal loop composed of the first main signal line 4a and the second main signal line 4b, and a loopback composed of the first sub-signal line 5a and the second sub-signal line 5b. Each of the signal lines 4a, 4b, 5a, 5b is connected to the transmitter / receiver section provided in the master station 1 and the slave stations 2 ... The main transmission line 3a and the sub transmission line 3b may each be formed by three or more signal lines.

The transmitter / receiver unit has a function of converting data transmitted and received via the signal lines 4a, 4b, 5a, 5b into a signal form suitable for transmission and a signal form suitable for information processing. For example, when the signal lines 4a, 4b, 5a, 5b are optical fiber cables, the signal form of data is converted into an optical signal and an electric signal.

Further, the master station 1 and the slave stations 2 ... Can execute various programs such as a communication processing routine having a function as data output means and a data confirmation processing routine having a function as data determining means. It has a data processing section, a storage section for storing data transmitted and received via the signal lines 4a, 4b, 5a, 5b, and a data correct / incorrect display section for indicating whether the data is correct or incorrect. The data correct / incorrect display unit may be, for example, an LED set to turn on when it is determined that the data is incorrect.

The communication processing routine executed by the above-mentioned data processing unit is the first and second main signal lines 4a and 4b of two systems forming a signal loop or the first and second systems of two systems forming a loopback. The same data is transmitted to the sub signal lines 5a and 5b, and both data received via these two lines of signal lines 4a and 4b or 5a and 5b are stored in the storage unit. It has become. Further, the data confirmation processing routine is configured to determine whether data is correct by comparing the data stored in the storage unit, and to perform the processing described later based on the determination result.

The operation of the supervisory control system having the above configuration will be described.

For example, when transmitting data from the master station 1, the data processing unit of the master station 1 executes a communication processing routine, and the data to be transmitted is the first main signal line 4a and the first main signal line 4a. It will be output to each of the two main signal lines 4b. When these pieces of data reach the slave station 2, the slave station 2 that has detected the arrival of the data executes the communication processing routine to store both data in the storage unit.

After that, the data confirmation processing routine is executed, the data stored in the storage unit are compared with each other, and if the two data are completely the same, there is an error in the data. By determining that there is no data and executing the communication processing routine, the data stored in the storage unit is output to the first main signal line 4a and the second main signal line 4b, respectively, and transmitted to the slave station 2 in the subsequent stage. become.

On the other hand, if a mismatch is found between the two data by comparison in the data confirmation processing routine, it is determined that an error has occurred in the data, and the display signal is sent to the data error display unit. Will be output. Accordingly, for example, when the data correctness display portion is an LED, it is confirmed that the data is erroneous due to the light emission of the LED. Furthermore, by determining that there is an error in the data, the master station 1 in the previous stage is requested to retransmit the data, and the master station 1 receiving this request has completed the transmission. The data will be output again to the first main signal line 4a and the second main signal line 4b. After that, when the mobile station 2 that has requested the retransmission receives the data and stores it in the storage unit, it again executes the data confirmation processing routine and compares the data with each other to determine whether or not an error has occurred in the data. Will be confirmed.

Further, if the received data does not match even after the data is retransmitted as described above, it is determined that an abnormality has occurred in the first main signal line 4a or the second main signal line 4b. Then, the switching signal is output so as to switch to the data transmission by the first and second sub signal lines 5a and 5b forming the loopback. After that, the supervisory control system performs data transmission by loopback, and the master station 1 and the slave stations 2 ... Respond to the data transmitted by the first and second sub signal lines 5a and 5b. The above-mentioned communication processing routine and data confirmation processing routine will be executed.

As described above, in the supervisory control system of the present embodiment, the master station 1 and the slave stations 2, which are a plurality of control devices, are connected in a loop by the main transmission line 3a and the sub transmission line 3b, and data is transmitted. It is designed to transmit. The main transmission line 3a and the sub transmission line 3b are formed by the first and second main signal lines 4a and 4b and the first and second sub signal lines 5a and 5b, respectively. Further, the master station 1 and the slave stations 2 ... Have a data output means for outputting the same data to the first and second main signal lines 4a and 4b or the first and second sub signal lines 5a and 5b, and And data determining means for comparing the data input from the second main signal lines 4a and 4b or the first and second sub signal lines 5a and 5b to determine the correctness of the data.

As a result, even if an error occurs in data due to noise, for example, the data input from the first and second main signal lines 4a and 4b or the first and second sub signal lines 5a and 5b are compared with each other. Since it is determined whether the data is correct or not, the data error is detected by the master station 1 and the slave station 2, which have received the data. Therefore, data transmission due to erroneous data can be prevented in the master station 1 and the slave stations 2, and the reliability of the entire system can be improved.

Further, in addition to the above-described configuration, the monitoring control system of the present exemplary embodiment re-transmits the data to the master station 1 or the slave station 2 in the preceding stage when the data determination means detects a data error. It has a retransmission requesting means for requesting transmission. As a result, even if an error occurs in the data, the normal data is retransmitted from the master station 1 or the slave station 2 in the previous stage, so that the system is not interrupted when the data is transmitted by the normal data. Yes.

[0023]

[Effect of device]

 As described above, the supervisory control system of the present invention outputs the same data to the main transmission line and the sub transmission line formed by a plurality of signal lines and all the signal lines of the main transmission line or the sub transmission line. And a control device provided with a data judging means for comparing the data inputted from all the signal lines of the main transmission path or the sub-transmission path to judge whether the data is correct or incorrect.

As a result, even if an error occurs in the data, the data input from all the signal lines of the main transmission line or the sub transmission line is compared with each other to judge whether the data is correct or incorrect. A data error will be detected by the control device that has received the. Therefore, it is possible to prevent the data transmission due to erroneous data in each control device, and it is possible to improve the reliability of the entire system.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a supervisory control system of the present invention.

FIG. 2 illustrates a conventional example and is a schematic configuration diagram of a monitoring control system.

[Explanation of symbols]

 1 Master Station (Control Device) 2 Slave Station (Control Device) 3a Main Transmission Line 3b Sub Transmission Line 4a First Main Signal Line 4b Second Main Signal Line 5a First Sub Signal Line 5b Second Sub Signal Line

Claims (1)

[Scope of utility model registration request] 1. A supervisory control system for connecting a plurality of control devices in a loop by a main transmission line and a sub transmission line to perform data transmission, wherein the main transmission line and the sub transmission line are respectively formed by a plurality of signal lines. The control device, the data output means for outputting the same data to all the signal lines of the main transmission line or the sub-transmission line, and the data input from all the signal lines of the main transmission line or the sub-transmission line A monitoring control system, comprising: a data determination unit that compares data with each other to determine whether the data is correct or incorrect.