Mitsubishi Electric MELSEC iQ-R Series User Manual page 57

In redundant line
■Tracking of system switching of the master station
By tracking the system switching of the master station, systems of the remote head module are switched.
For system switching of the master station, refer to the following.
 MELSEC iQ-R CC-Link IE Field Network User's Manual (Application)
Conditions of system switching
The following table lists the conditions of system switching.
: System switching enabled, : System switching disabled
System switching condition
Normal or minor error (standby system)
Moderate error or major error (standby
*1
system)
Error detected in network (standby system)
Memory copy being executed from the
control system to the standby system
Mismatch between operating statuses of
*1
both systems
*1
System switching being executed
*1 When system switching is not possible, the CTRL LED of the remote head module of the control system flashes.
• When even one of the conditions for system switching disabled is satisfied, system switching is not
executed.
• In case an operation or phenomenon not mentioned in the table occurs, system switching is not performed.
Single line
Automatic system switching
Reset or Moderate error
hardware failure or major error
 
 
*1
 
 
*1
 
 
Manual system
switching
Data link error System
switching
operation using
the engineering
tool
 
 
 
 
 
 
1.8 Redundant Function
1
Redundant line
Automatic
system
switching
System
switching of
redundant
master station
system

(Always tracks the
system state of the
master station.)
1 FUNCTIONS
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