Mitsubishi Electric MELSEC-Q Series Programming Manual page 178

Number Name
SM320 SFC program
presence/absence
SM321 SFC program START/
STOP
SM322 SFC program START
status
SM323 All-blocks continuous
transition status
APPENDICES
176
Appendix 1 Special Relay and Special Register List
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.
OFF: SFC program not • The same value as in
executed (stop) SM320 is set as the
ON: SFC program default value.
executed (start) (Automatically switches
ON when the SFC
program exists.)
• When this relay is
switched from ON to OFF,
the SFC program
execution is stopped.
• When this relay is
switched from OFF to ON,
the SFC program
execution is restarted.
OFF: Initial START The SFC program start
ON: Resumptive START mode set in the SFC setting
of the PLC parameter dialog
box is set as the default
value.
At initial start: OFF
At resume start: ON
OFF: Continuous Set whether a continuous
transition enabled transition will be performed
ON: Continuous transition or not for the block where
disabled the "continuous transition
bit" of the SFC information
devices has not been set
Set by Corresponding CPU
(When set)
(1) (2)
 
S (Initial)
*1
S (Initial), U
S (Initial), U
U
(3) (4) (5)
  