The A station and the B station control the IO on the DP slave by two IM153-2 respectively. It is not clear how the two interfaces coordinate the control output (the output is on the DP slave) 1. If station A writes Q0.0 to 1, B station is outside the redundancy program FB101'SWR_ZYK' (not skipped), writes Q0.0 to 0, and the actual output is å•¥?
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EgQ0.0~Q0.3 is set to the redundant mapping in FC100'SWR_START', station A is the master station
1. If station A writes Q0.0 to 1, B station is outside the redundancy program FB101'SWR_ZYK' (not skipped), writes Q0.0 to 0, and the actual output is å•¥?
2. If station A writes Q0.5 to 1, B stands outside the redundancy program FB101'SWR_ZYK' (not skipped), writes Q0.5 to 0, and the actual output is å•¥?
A: The principle:
When working in a soft redundant system, the primary and secondary control systems (processor, communication, I/O) operate independently, and the master system's plc masters the I/O control rights in the redundant ET200M slaves. The standby system synchronizes data through a dedicated software redundancy program. The PLC program consists of a non-duplicated user program segment and a redundantbackup user program segment. The main system PLC executes all user programs. The standby system PLC skips the redundancy program by judging the redundancy state and only executes Non-redundant user program. When a component in the primary system fails, the standby system automatically switches to the primary system, performs redundant procedures, and the control task does not interrupt.
The B system redundancy program is not skipped. Only when the A system component fails, the standby system will automatically switch to the main system and execute the redundancy program. If the A system is normal, the B system PLC skips the redundancy by judging the redundancy status. Remaining procedures.
Therefore, the actual output is 0.
2. If station A writes Q0.5 to 1, B stands outside the redundancy program FB101'SWR_ZYK' (not skipped), writes Q0.5 to 0, and the actual output is å•¥?
The B system redundancy program is not skipped. Only when the A system component fails, the standby system will automatically switch to the main system and execute the redundancy program. If the A system is normal, the B system PLC skips the redundancy by judging the redundancy status. Remaining procedures.
Therefore, the actual output is 0.
January 29, 2023