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Table3.4 Special Relay Application List

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