JPH0570974B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an information transmission device, and in particular, when a part of an input/output device malfunctions, the faulty part is disconnected (access is stopped) and other normal parts are connected. The present invention relates to a supervisory control system that is operated solely by the operator and is required to notify a master station of failures.

[Background of the invention]

As described in Japanese Patent Application Laid-open No. 19069/1983, conventional devices periodically insert check frames for fault detection during normal transmission to detect faults in slave stations and perform degenerate operation. However, since the device is operated in an abnormal state from the occurrence of a failure until the master station detects the failure and degenerates, it has the disadvantage that real-time performance is poor and unnecessary data is sent to the slave station.

[Purpose of the invention]

The purpose of the present invention is to provide a degenerate operation method for an information transmission device that allows degenerate operation of the information transmission device without unnecessary data processing and data transmission by immediately disconnecting the failed part when a failure is detected in a slave station. It is on offer.

[Summary of the invention]

The present invention provides an information transmission device in which, even when a failure occurs in the input circuit of a slave station, the input data is transmitted to the master station in the same way as in normal conditions until a check frame for terminal failure detection is transmitted, and the master station Focusing on the fact that received data is being processed, when a fault is detected in a slave station, the slave station itself disconnects the faulty part and sends the fault information to the master station, without transmitting the input data of the faulty part to the master station. By transmitting data, the burden on the master station is reduced, the efficiency of data transmission is increased, and the reliability of the system is further improved.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 13. Figure 13 is a system configuration diagram,
The figure shows the configuration of the device, and FIG. 2 shows the input circuit of the present invention. In the figure, 1 is a master station as a central processing unit that manages transmission, and 2 is a signal transmission device that connects the master station and each slave station 3. The slave station 3 also includes a data transmitting/receiving section 4 connected to the signal transmission device 2, a plurality of data input/output sections 10, a bus 9 connecting the transmitting/receiving circuit and the plurality of data input circuits, a microprocessor 5, and a microprocessor 5 and an internal bus. It consists of ROM memory 7 and RAM memory 8 connected by 6. The ROM memory 7 has built-in programs shown in FIGS. 3 to 5, and the RAM memory 8 has a failure detection table for each group and an error table (FIG. 7) that stores error status for each card. A degenerate parameter storage table (Fig. 6) that stores degenerate parameters for each CE and input card, a current value storage table (Fig. 9) that stores the current values of slave stations, and a word in which a state change has occurred is stored as time data. A state change storage table (FIG. 8) is built in to store additional information.

Normally, this device inputs data from a monitored device at specific scan intervals using a process input card 12, adds a corresponding group address and word address to it using a CE 11, and passes the input data to a processor 5 via a bus 9. Processor 5 is
The current value data of the group address and word address corresponding to the data passed from the current value storage buffer in the RAM memory 8 is read out and compared with the input data. If there is no change in state, the input data is discarded as it is and the process moves on to scanning the next word address. If a change in state has occurred, the corresponding current value storage buffer is rewritten with the current input data, and the data is also stored in RAM memory 8. The time signal is added and stored in the state change storage table in .
In addition, the state change data is deleted from the state storage table at the time it is sent to the master station, and if the state change storage table becomes full, only the current value storage table is rewritten, and the state change data is not stored in the state change storage table. shall not be reflected. The current value data and status change data taken in in this way are converted into a transmission format by the processor 5 in response to a request from the master station, and sent via the transmission/reception circuit 4 and the signal transmission device 2 at a specific polling cycle. Master station 1
sent to. In the polling method, a request is usually made to send state change data, and in many cases, it is a general rule to send all state change data at that time (divided into multiple times if necessary). In conventional devices, if a failure occurs in the input card in such a case and false state change detections occur frequently, the master station requires a considerable amount of time to detect the state change of one slave station until the next failure detection check frame is transmitted. In addition, even during degenerate operation after parameter loading from the master station, unreliable data that requires multiple transmission processes remains in the state change storage table, and the current value storage table does not contain reliable data after a failure occurs. The drawback was that low data remained.

The present invention eliminates this drawback, and the processing when a failure occurs in the present invention will be described below.

When a failure occurs in the process input card 12, the process input card 12 outputs a failure signal to the CE 11. CE11 receives the fault signal and sends it via bus 9.
A failure interrupt is input to the processor 5. The processor 5 that received the failure interrupt recognizes the group address and word address where the failure occurred through the failure interrupt routine of the program built in the ROM 7.
The respective failure information and regression parameters are set in the error table and regression parameter storage table for the corresponding group address and word address. Next, when importing input signals, use the degeneracy parameter storage table to first check whether there is degeneration in each group, then check whether the corresponding group has degeneration in each card, and check if the degeneracy parameter has been set. If the card is scanned and the degeneracy parameter is set, the card is not scanned and the next word is scanned. After completing the input signal capture routine, when transmitting data to the master station, check the group failure detection table of the error table in RAM 8, and if there is degeneration due to the occurrence of a failure, flag the failure occurrence in the master station. This is done to distinguish it from degeneration due to remote data loading from the master station. When the master station learns of the occurrence of a failure, it requests the slave station to send error information if necessary, and the slave station that receives the request sends the group address of the group for which "1" is set in the group failure detection table of the error table. and the error table of that group are sent to the master station, and the bit of the group failure detection table of the group whose transmission has ended is cleared to "0".
The series of operations ends. The master station requests the transmission of state change data and current value data as necessary, but according to this embodiment, the current value storage table can always have the latest and correct data, and the input circuit after a failure occurs. In order to prevent data capture by
This has the effect of increasing transmission efficiency and processing efficiency of the master station, and improving reliability and processing capacity of the entire system.

〔Effect of the invention〕

According to the present invention, when a failure occurs in the slave station input device, it is possible to immediately disconnect the failed part in each card in the slave station and perform degenerate operation in other normal parts, thereby eliminating unnecessary data processing. The system can be operated without data transmission, and failure information is sent from the slave station to the master station, thereby improving system reliability.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a device according to the present invention, Fig. 2 is an embodiment of an input circuit with a failure detection circuit, Fig. 3 is an input signal acquisition routine, Fig. 4 is a failure interrupt routine, and Fig. 5 is a data transmission routine, Figure 6 is a degenerate parameter storage table, Figure 7 is an error table, Figure 8 is a state change data storage table, and Figure 9 is a data transmission routine.
The figure shows a current value storage table, FIG. 10 shows an example of a transmission format of a faulty degenerate bit, FIG. 11 shows a time chart of the present invention, FIG. 12 shows a time chart of a conventional device, and FIG. 13 shows a system configuration diagram. DESCRIPTION OF SYMBOLS 1... Master station, 2... Signal transmission device, 3... Slave station, 4... Transmission/reception circuit, 5... Microprocessor, 6... Internal bus, 7... ROM memory, 8...
...RAM memory, 9...I/O bus, 10...
Data input/output device, 11... CE (control electronics), 12... Input circuit with failure detection circuit, 13... PI/O connection bus, 14...
...Input signal selection circuit, 15...Multiple selection detection circuit, 16...Data input interface circuit,
17...Photocoupler, 18...Relay.

Claims (1)

[Scope of Claims] 1. In a degenerate operation method of an information transmission device of a slave station connected to a master station via a transmission circuit, when a failure detection circuit that detects a failure of a process input/output circuit detects a failure, storing fault information indicating whether or not a fault has been detected for each process input/output circuit unit in an error table; storing a degeneracy parameter corresponding to the fault information in a degeneracy parameter storage table for each process input/output circuit unit; The information transmission device is characterized in that the transmission device receives an input signal from a process input/output circuit other than the process input/output circuit corresponding to the degeneration parameter stored in the degeneration parameter storage table and transmits it to the master station. degenerate operation method. 2. In the degenerate operation method of an information transmission device according to claim 1, the information transmission device is characterized in that the information transmission device transmits the failure information to a master station based on the contents of the error table. A degenerate operation method for information transmission equipment.