System Consistency Check And Operations When An Error Occurs - Mitsubishi Electric MELSEC iQ-R Series User Manual

System consistency check and operations when an error occurs

When the redundant function is used, for control of the system to continue when systems are switched, the files and operating
statuses of the remote head modules of the control system and standby system must be the same.
The system consistency check checks whether the files and operating status of the remote head module of the standby
system are the same as those of the control system.
Check item
The following table lists the check items for the system consistency check.
Check item
File
Operating status
Execution conditions
The following table lists the execution conditions for the system consistency check.
: Executed, : Not executed
*1
Execution conditions
Execution timing
Power-on
When reset is cleared in the control system or
the standby system
When the standby system is connected
When operating status changes
*1 This function is not executed on a condition not mentioned in the table.
*2 Depending on the execution timing, some file types are not treated as system consistency check targets. ( Page 52 Target file)
*3 Only at the time of system switching, the system consistency check is executed.
Description
The parameters and device initial values are checked.
The operating status (RUN state/STOP state) of the remote head module is
checked.
Operating status of the Operating status of the
standby system control system
 
 
 
RUN RUN
STOP
STOP RUN or STOP
STOP  RUN
RUN
STOP
Reset clear RUN
STOP
Check item
*2
Files Operating
status
 
 
 
*3
 
 
 
 
 
 
 
1 FUNCTIONS
1.8 Redundant Function
1
51