Interlock abnormal detection method and substation terminal used in the method

Abstract

[Problem] Provided is an interlock abnormality detection method that allows for, in a control / monitor signal transmission system wherein a transmission synchronization scheme is used to perform data transmissions, a determination as to whether the cause of a halt of an output unit is an interlock, while executing the interlock. Also provided are slave station terminals used in that method. [Solution] Each of a plurality of slave stations connected to each other via a common data signal line treats, as a condition station, a given one of the other slave stations that corresponds to an output or input unit performing an output or input operation contradictory to the operation of another output unit to which the local slave station corresponds, and further, from a transmission signal, each of the plurality of slave stations takes in, as condition data, control data for the condition station or monitor data sent from the condition station. Then, each of the plurality of slave stations executes an interlock on the basis of a logical determination using the condition data and also using output data for the output unit to which the local slave station corresponds, and further each of the plurality of slave stations superimposes, on a management data area of the transmission signal, a signal constituting data that indicates an interlock abnormality.

Description

technical field [0001] The present invention relates to a method for interlock abnormality detection and a substation terminal used in the method. In a control and monitoring signal transmission system in which the signal lines between substations are reduced in wiring and connected with a common data signal line, and data transmission is performed by a transmission synchronization method such as transmission frequency synchronization, it is possible to grasp whether the interlock is executed or not. In addition, the output unit operates in response to instructions from the control unit, and corresponds to an actuator (actuator), (stepping) motor, solenoid (solenoid), solenoid valve, relay (relay), and thyristor (thyristor). On the other hand, the so-called input unit is to transmit information about the output unit to the control unit, and corresponds to, for example, a reed switch, a micro switch, a push button switch, a photoelectric switch, various sensors, and the like. ...

AI Technical Summary

Problems solved by technology

[0005] However, the interlocking of the above-mentioned distributed monitoring and control system is difficult to apply to the data transmission by the transmission synchronization method due to the use of specific control sub-stations and control master stations, or the so-called command transmission method in which the control sub-stations each give and receive direct information. Transmission control monitoring signal transmission system

[0006] Furthermore, in systems using interlocks, usually when the output device actually stops, it is impossible to distinguish whether the stop is due to the interlock or due to other reasons, and it is impossible to resolve the root cause

So there is the problem that the stop of the output device will still occur repeatedly afterwards

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