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9.2 Precautions for Dedicated Instructions
9.2.1 Precautions for Dedicated Instructions (Common)
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DEDICATED INSTRUCTIONS
(c) Using the Service processing setting (For Universal model QCPUs)
In Service processing setting of PLC parameter (PLC system) in GX Developer,
secure a time of 2ms to 3ms for service processing.
Remark
For details on the COM instruction. refer to the following manual.
QCPU (Q Mode)/QnACPU Programming Manual (Common Instructions)
(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.
For program examples, refer to the following.
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