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Special Relays, Special Registers
Table3.4 Special Relay Application List
Item
Special
Relay
Application/Description
Initial
processing
flag
(1 scan ON)
M9038
(1)This relay turns on for one scan when the built-in PLC function
switches from STOP to RUN.
(2)Using M9038, you can create a sequence program to be
executed only once without using the PLS instruction at
switching from STOP to RUN.
Normal OFF
flag
M9037
This relay remains off while power is on.
Can be used to temporarily disable execution for debugging, etc.
Normally ON
flag
M9036
This relay is on while power is on.
Can be used to create a program to be executed only once after
power-on.
RUN flag M9039
This relay turns on at the second scan of the sequence program
when SQ-SD are shorted.
ON
M9038
OFF
Switching from STOP to RUN
0
Sequence
program
1 scan
END/0 END/0 END/0 END/0
M9038
Initial processing program
M9039
OFF
RUN
0
Sequence
program
END/0
ON