Mitsubishi Electric MELSEC iQ-R Series User Manual page 149

Redundant function (other system remote head module information)
The following table lists the special relay areas relating to the redundant function. The remote head module information of the
other system is stored.
All relays are turned off when a redundant system is not used.
: Can be set, : Cannot be set
No. Name
SM1679 Error reset (the other
system)
SM1680 Error of the other
system monitoring
SM1681 Latest self-diagnostic
error
SM1682 Latest self-diagnostic
error
SM1683 Detailed information
1 in use flag (the
other system)
SM1684 Detailed information
2 in use flag (the
other system)
Data stored Details
OffOn: Standby This relay is turned off and on to clear the
system error reset minor error occurred in the standby system.
requested This relay is turned off when the error clear of
OnOff: Standby the standby system has been completed.
system error reset The initial value is off.
completed
Off: No error This relay is turned on if an error occurs on
On: Error communications with the other system when
an initial processing (including when the
system is determined while waiting for the
other system starts up) or an END
processing is performed. (This relay is turned
on when any of 'Cause of the other system
monitoring error' (SD1648) bits turns on.)
This relay is turned off when an error is
cleared.
Off: No error This relay is turned on if a diagnostic error
On: Error occurs in the other system remote head
module.
The status of 'Latest self-diagnostic error'
(SM0) for the other system remote head
module is reflected.
Off: No error This relay is turned on if a self-diagnostic
On: Error error occurs in the other system remote head
module.
The status of 'Latest self-diagnostic error'
(SM1) of the other system remote head
module is reflected.
Off: Not used This relay is turned on when there is detailed
On: In use information 1 for an error occurred in the
other system remote head module.
The status of 'Detailed information 1 in use
flag' (SM80) of the other system remote head
module is reflected.
Off: Not used This relay is turned on when there is detailed
On: In use information 2 for an error occurred in the
other system remote head module.
The status of 'Detailed information 2 in use
flag' (SM112) of the other system remote
head module is reflected.
Set by (setting Effective system
timing)
Control
system

U/S (Status change)
S (Every END/system 
switching)

S (Every END)

S (Every END)

S (Every END)

S (Every END)
Appendix 3 List of Special Relay (SM) Areas
Standby
system




A


APPX
147