User`s manual

App - 4
Appendix 1 Special Relay List
APPENDICES
(5) Boot operation
(6) Instruction-Related Special Relays
(7) CC-Link Safety
TableApp.6 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM660 Boot operation
OFF : Program memory
execution
ON : During boot
operation
(On the TEST MODE)
• Turns ON during the boot operation from
standard ROM.
• Turns OFF when the boot operation from
standard ROM is not run.
(On the SAFETY MODE)
• Always ON
S (Initial) QS
TableApp.7 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM722
BIN/DBIN
instruction error
disabling flag
OFF : Error detection
performed
ON : Error detection not
performed
• Turned ON when "OPERATION ERROR" is
suppressed for BIN or DBIN instruction.
UQS
TableApp.8 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM1004
Safety station
refresh
communication
status
(Safety master
module 1)
OFF : Nomal
ON : Communication
error
The safety station refresh communication
atatus is stored. (The status of each station are
stored in SD1004 to SD1007.)
S (Status change)
QS
SM1204
Safety station
refresh
communication
status
(Safety master
module 2)
OFF : Nomal
ON : Communication
error
The safety station refresh communication
status is stored. (The status of each station are
stored in SD1204 to SD1207.)
S (Status change)