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APPX
Appendix 6 Dedicated Instruction
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RECV and RECVS instructions
• When the SEND instruction is executed for the control system, if the systems are switched before execution of the RECV
instruction and interrupt program, the control system retains RECV instruction execution request area (SB0030 to SB0031)
and the interrupt program interrupt factor (interrupt pointer). If system switching occurs again, and the standby system is
switched to the control system, the RECV instruction and interrupt program will be executed by the data retained in RECV
instruction execution request area (SB0030 to SB0031) and the retained interrupt program interrupt factor.
• When the SEND instruction is executed for the standby system, and the standby system receives data from the sending
station, the standby system retains RECV instruction execution request area (SB0030 to SB0031) and the interrupt
program interrupt factor (interrupt pointer). Therefore, when the standby system is switched to the control system due to
system switching, the RECV instruction and interrupt program will be executed by the data retained in RECV instruction
execution request area (SB0030 to SB0031) and the retained interrupt program interrupt factor.
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REQ instruction
When performing remote STOP or remote RUN on a redundant system, do as follows: Perform STOP on the standby system
STOP on the control system
RUN on the control system
RUN on the standby system.
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For the REMFR, REMTO, REMFRD, REMTOD, SINFTYRD, or SINFSTRD instructions
When using the REMFR, REMTO, REMFRD, REMTOD, SINFTYRD, or SINFSTRD instructions for the remote head modules
in a redundant system configuration, specify the control system station number for the target station number.
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