Special Relay (Sm) List - Mitsubishi Electric MELSEC-Q Series Programming Manual

Special Relay (SM) List

The following table lists the special relays that can be used in the SFC programs.
Number Name
SM90 Step transition
watchdog timer START
(corresponds to SD90)
SM91 Step transition
watchdog timer START
(corresponds to SD91)
SM92 Step transition
watchdog timer START
(corresponds to SD92)
SM93 Step transition
watchdog timer START
(corresponds to SD93)
SM94 Step transition
watchdog timer START
(corresponds to SD94)
SM95 Step transition
watchdog timer START
(corresponds to SD95)
SM96 Step transition
watchdog timer START
(corresponds to SD96)
SM97 Step transition
watchdog timer START
(corresponds to SD97)
SM98 Step transition
watchdog timer START
(corresponds to SD98)
SM99 Step transition
watchdog timer START
(corresponds to SD99)
Meaning Explanation
OFF: Not started • Switched ON to begin the
(Watchdog timer reset) step transition watchdog
ON: Started (Watchdog timer count.
timer start) • Watchdog timer is reset
when switched OFF.
Set by Corresponding CPU
(When set)
(1)
U 
Appendix 1 Special Relay and Special Register List
(2) (3) (4) (5)
   
A
APPENDICES
175