Precautions For Dedicated Instructions; Precautions For Dedicated Instructions (Common) - Mitsubishi Electric MELSEC-Q Series User Manual

10.2 Precautions for Dedicated Instructions

10.2.1 Precautions for dedicated instructions (common)

The following describes precautions when using dedicated instructions.
(1) When changing data specified by dedicated instructions
(2) When the dedicated instruction is not completed
(3) When accessing another station by a dedicated instruction during CC-
Do not change any data (e.g. control data) until execution of the dedicated instruction is
completed.
Check whether the mode of the Simple Motion module is online.
A dedicated instruction cannot be executed when the mode is offline.
Link IE Field Network diagnostics
Execution of a dedicated instruction may take some time. To reduce the waiting time,
perform the CC-Link IE Field Network diagnostics using the following methods and then
execute the dedicated instruction.
(a) Using the COM instruction
After communication with GX Works2 using the COM instruction, execute the
dedicated instruction.
1) Store 0 in the Selection of refresh processing during COM instruction
execution (SD778).
2) Turn on the Selection of link refresh processing during COM instruction
execution (SM775).
3) When the COM instruction is executed, communication with GX Works2 is
executed.
4) Use a dedicated instruction to access another station.
SM402
Start contact
(b) Using the service processing setting
In the service processing setting of PLC Parameter (PLC System) of GX Works2,
secure 2 or 3 ms for the service processing time.
REMARK
For details on the COM instruction, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
Chapter 10 DEDICATED INSTRUCTIONS
10 - 4
MOV H0 SD778
SET SM775
COM
Dedicated Instruction