Mitsubishi Electric MELSEC Q Series Reference Manual page 329

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In the service processing setting of the PLC parameter (PLC system) in the programming tool, secure time of

2ms to 3ms for service processing.

For details on the COM instruction, refer to the following.

Programming Manual (Common Instructions) for the CPU module used

(4) Executing a dedicated instruction from a redundant system

If a system switching occurs during instruction execution, execution of the instruction is stopped and its

processing is not completed.

To re-execute such an uncompleted instruction in the new control system after system switching, provide an

interlock using One scan ON after system switching (SM1518) and Completion device.

Note that the same instruction may be executed twice.

• Program example:

Page 361, Section 9.5 (5)

CHAPTER 9 DEDICATED INSTRUCTIONS

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