Appendix special soft device list
The plus/minus operation result is 0
“borrow” occurs in minus operation
When carry occurs in plus operation or overflow
occurs in bit shift operation
Non-retentive register reset
When driving this M, ON/OFF mapping memory of
Y, M, S, TC and the current values of T, C, D are all
reset to be 0
When PLC changes from RUN to STOP, leave all
content in mapping registers and data registers
Set PC’s all external contacts to be OFF status
Set communication parameters flag
All output reset forbidden
When shifting the mode, all outputs reset
functions are forbidden
When M8047 activating, act when any device of
S0~S999 turns to be ON
Stepping Ladder (M8041-M8046)
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