JPS61236241A - Operating system for degeneracy of information transmitter - Google Patents

Abstract

PURPOSE:To apply degeneracy operation of an information transmitter without unnecessary data processing and data transmission by separating immediately a faulty part when a slave station detects a fault. CONSTITUTION:If a process input card 12 of a slave station 3 is faulty, the card 12 sends a fault signal to a control electronics circuit CE 11. The CE 11 input a fault input to a processor 5 via a bus 9. The processor 5 uses a fault interruption routine of a program incorporated in a ROM 7 to recognize a group address and a word address for the fault and sets fault information and a degeneracy parameter into an error table and a degeneracy parameter storage table of the corresponding group address and word address. In fetching an input signal, the degeneracy parameter storage table in a RAM 8 is used to check at first the presence of degeneracy in the unit of groups and then to check whether the degeneracy in the unit of cards exists in the corresponding group or not, and when the degeneracy parameter is set, the card is not scanned but the next word is scanned.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an information transmission device, in particular, when a part of an input/output device malfunctions, the malfunctioning part is isolated and access is stopped), and other normal operations are performed. The present invention relates to a supervisory control system that operates only in one part and is required to notify a master station of failures.

[Background of the invention]

As described in Japanese Patent Laid-Open No. 58-19069, conventional devices periodically insert check frames for failure detection during normal transmission to detect failures 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, there is a drawback that real-time performance is poor and unnecessary data is sent from the slave station.

[Purpose of the invention]

An object of the present invention is to perform degenerate operation of an information transmission device by immediately disconnecting a failed part when a failure is detected in a slave station, thereby performing degenerate operation of the information transmission device without performing unnecessary data processing or data transmission. There is a method to provide.

[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 7 frame for terminal failure detection is transmitted. Focusing on the fact that the received data is processed in the slave station, when a failure is detected in the slave station, the slave station itself disconnects the failed part without transmitting the input data of the failed part to the master station and informs the master station of the failure. By transmitting information, the burden on the master station is reduced, data transmission efficiency is increased, and system reliability is improved.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 13. FIG. 13 is a system configuration diagram, FIG. 1 is a device configuration diagram, and FIG. 2 is an 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. Further, the slave station 3 has a data transmitting/receiving section 4 connected to the signal transmission device 2.
and a bus 9 that connects the transmission/reception circuit to the plurality of data input/output sections 101 and the plurality of data input circuits, and a microprocessor 5, and a bus R, 0 connected to the microprocessor 5 by an internal bus 6.
It consists of an M memory 7 and a RAM memory 8. 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. Degenerate parameter storage table (which stores degenerate parameters for each CE and input card)
(Figure 6), a current value storage table (Figure 9) that stores the current values of slave stations, and a status change storage table (Figure 8) that stores words where a status change has occurred with time data added. Built-in.

Typically, the device inputs data from the monitored device via a process input card 12 at specific scan intervals, and
The corresponding group address and word address are added to l, and the input data is passed to the processor 5 via the bus 9. The processor 5 reads 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, and compares it 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 packa is rewritten with the current input data, and the same <RA
The time signal is added to and stored in the state change storage table in the M memory 8.

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 deleted from 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 transmitter/receiver circuit 4 and the signal transmission device 2 to a specific polling data. It is transmitted to the master station 1 at regular intervals. In the polling method, a request is usually made to send state change data, and in many cases, the principle is to send all state change data at that time (divided into multiple times if necessary). In conventional devices, when a failure occurs in the input card in such a case, and false υ state change detection occurs frequently, the master station takes a large amount of time to detect the state change of one slave station until the next failure detection check frame is sent. . In addition, even during degenerate operation after parameter loading from the master station, unreliable data that requires multiple transmission processes remains in the status change storage table, and unreliable data that requires multiple transmission processes remains in the current value storage table. The disadvantage 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 CEII. Upon receiving the fault signal, the 90EII inputs a fault interrupt to the processor 5 via the bus 9. The processor 5 that received the failure interrupt is RO
The fault interrupt routine of the program built into the M7 recognizes the group address and word address where the fault has occurred, and stores the respective fault information and stuck-in parameters in the error table and stuck-in parameter storage table for the corresponding group address and word address. Set. Next, when input signals are captured, the degeneracy parameter storage table is used to first check whether there is degeneracy in groups, then check whether the corresponding group has degeneracy in card units, and set the degeneration parameters. If not, the above-mentioned scan is performed, and if the degeneration 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-by-group failure detection table of the error table in the AM8, and if there is degeneration due to a failure, set a flag for failure in the master station. This is notified and distinguished from degeneracy due to spider data loading from the master station. When the master station learns of the occurrence of a fault, it requests the slave station to send the information if necessary, and the slave station that receives the request writes '1' in the group-by-group failure detection table of the error table.
The group address of the group for which ``'' is set 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 10'', and the series of operations ends. . The master station requests the transmission of status change data and current value data as necessary, but according to this implementation sequence, the current value storage table can always contain the latest and correct data, and can also be input after a failure occurs. Since data is prevented from being taken in by the circuit and unreliable data is not sent to the master station, transmission efficiency and processing efficiency of the master station are increased, and the reliability and processing capacity of the entire system are improved.

〔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 degraded operation using other normal parts, so that unnecessary data is The system can be operated without any processing or data transmission, and since failure information is sent from the slave station to the master station, the reliability of the system is improved.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a device according to the present invention, Fig. 2 is an embodiment of an input circuit having a failure detection circuit, Fig. 3 is an input signal acquisition routine, Fig. 4 is a failure interrupt routine, and Fig. 5 is the data transmission routine, Figure 6 is the degenerate parameter storage table, and Figure 7 is the data transmission routine.
The figure shows an error table, FIG. 8 shows a status change data storage table, FIG. 9 shows a current value storage table, FIG. 10 shows a transmission format string of failure regression bits, FIG. 11 shows a time chart of the present invention, and FIG. 12 is a time chart of a conventional device, and FIG. 13 is a system configuration diagram. 1... Master station, 2... Signal transmission device, 3... Slave station,
4...1 transmission/reception circuit, 5...Microprocessor, 6
...internal bus, 7...R, (JM memory, 8...
几AM memory, 9...I10 bus, 10...data input device, ll...CB (control electronics), 12...input circuit with failure detection circuit, 1
3... PI10 connection bus, 14... Input signal selection circuit, 15... Multiple selection detection circuit, 16... f-ta human interface circuit, 17... Photocoupler,
18...Relay.

Claims (1)

[Claims] 1. In the information transmission device of the slave station connected to the master station via the transmission line, if a failure detection circuit is installed to detect a failure in the process input/output circuit, and the failure is detected when the process input/output circuit is accessed, A degenerate operation method for an information transmission device, characterized in that access to the process input/output circuit is stopped and a report to that effect is made at the time of data transmission to the next master station.