Mitsubishi Electric MELSEC iQ-R Series - Program Execution in both Systems

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26 REDUNDANT FUNCTION
26.6 Program Execution in Both Systems
26.6 Program Execution in Both Systems
This function detects an error in the external device or network of the systems (control system and standby system)
respectively by executing a program that diagnoses external devices and networks in both systems.
When "Both Systems Executions" is set to a program in "Both Systems Program Executions Setting", the program is executed
by the CPU modules of both systems.
Ex.
When an error is detected in the external device connected to the standby system, the error is notified by generating a
continuation error.
(1) A diagnostic program that is set as a program executed in both systems is executed.
(2) An error is detected in the external device connected to the standby system by the diagnostic program.
(3) The PALERT instruction is executed, and the detected error is displayed in the detailed information of the continuation error.
(3)
(2)
(1)
External device
External device