Mitsubishi Electric MELSEC Q Series Reference Manual page 414

• When the target station is on a redundant system
Confirm that the target station is on the control system, and execute the SEND instruction.
If it is on the standby system, the RECV instruction is not executable, and thereby the target station
storage channel cannot be used.
For target station No. specification, provide an interlock using Redundant system
status (3) (SW01F0 to SW01F7) to ensure the target station is control system.
● When the control system was switched to the standby system after execution of the SEND instruction to the control
system and before reading the data sent by the SEND instruction
Execute the SEND instruction again to the new control system.
The data sent by the SEND instruction must be read out to the standby system after it is switched to control system.
● When the SEND instruction was executed to the standby system
Execute the SEND instruction again to the control system.
The data sent by the SEND instruction must be read out to the standby system after it is switched to control system.
412
Processing program for send completion
Processing program for normal completion
Processing program for error completion
Control data
setting for SEND
instruction
Stores send data in
D750 to D753.
Execution of
SEND instruction
Error code reading,
etc.