Mitsubishi Electric MELSEC Q Series Reference Manual page 401

(d) Program example
The following example program is written to the CPU module of station No.1.
CHAPTER 9 DEDICATED INSTRUCTIONS
Processing program for write completion
Processing program for normal completion
Processing program for error completion
Control data setting
for REQ instruction
Request data setting
for REQ instruction
Execution of REQ
instruction
Error code reading,
etc.
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