Mitsubishi Electric MELSEC iQ-R Series User Manual page 145

System information
The following table lists the special relay areas relating to the system information.
No. Name
SM203 STOP contact
SM230 Remote head No.1 error flag
SM231 Remote head No.2 error flag
SM240 Remote head No.1 reset flag
SM241 Remote head No.2 reset flag
System clock
The following table lists the special relay areas relating to the system clock.
No. Name
SM400 Always On
SM401 Always Off
Fixed scan function information
The following table lists the special relay areas relating to the fixed scan function information.
No. Name
SM480 Cycle overrun flag for inter-
module synchronization
SM488 Inter-module synchronization
error (out of synchronization
was detected on the remote
head module)
Data stored Details
Off: Other than STOP state This relay is turned on in STOP state.
On: STOP state
Off: Remote head No.n • This relay is turned off when the remote head
normal module of the remote head No.n is normal
On: Remote head No.n (including minor error).
moderate/major error • This relay is turned on when a moderate or
major error occurs in the remote head module
of the remote head No.n.
Off: Remote head No.n not • This relay is turned off when the remote head
being reset module of the remote head No.n is not being
On: Remote head No.n in reset.
reset mode • This relay is turned on when the remote head
module of the remote head No.n is being
reset (including the case when the remote
head module is removed from the base unit).
Data stored Details
Always on
ON
OFF
Always off
ON
OFF
Data stored Details
Off: No error for the inter- • This relay is turned on during inter-module
module synchronization synchronization when the I/O refresh,
(Normal) intelligent function module refresh, and data
On: Error state for the inter- transfer between the devices are not
module synchronization completed within the inter-module
synchronization cycle.
• The ON state is maintained even after the
later processing is completed within the
specified inter-module synchronization cycle.
(Cleared by turning power off and on or
resetting).
Off: No error for the inter- • This relay is turned on when the inter-module
module synchronization synchronization signal cannot be identified
signal (Normal) within the inter-module synchronization cycle
On: Error state for the inter- specified in the parameter or more than one
module synchronization signal has been identified within the same
signal inter-module synchronization cycle.
• The ON state is maintained even after the
inter-module synchronization signal can be
later identified within the specified inter-
module synchronization cycle. (Cleared by
turning power off and on or resetting).
Set by (setting timing)
S (Status change)
S (Status change)
S (Status change)
Set by (setting timing)
Power-on to RUN or STOP
to RUN
S (Status change)
Set by (setting timing)
S (Status change)
S (Status change)
Appendix 3 List of Special Relay (SM) Areas
A
APPX
143