Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual page 58

Device No.
MELSEC iQ-R Q series Motion
Motion device compatible
assignment device
assignment
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3 G-CODE CONTROL DEDICATED SIGNALS
56
3.9 G-Code Control Line Monitor Device (Expansion)
Symbol Signal name
Md.3179 Program monitor being executed (2nd
line)
Refresh cycle Fetch cycle

At block change
Signal type
Monitor device