Mitsubishi Electric MELSEC iQ-R-R04CPU - Chapter 28 Functions

28 FUNCTIONS
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28 FUNCTIONS
This chapter describes the redundant functions and the functions that are different (modified or restricted) from those of the
process mode. Functions not described in this chapter are the same as those described in PART 2.
For the availability of the functions in the redundant system, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Startup)
Function Description Reference
Redundant function Operation mode change Switches the operation mode of the redundant system
between the backup mode for normal operation and the
separate mode for system maintenance while it is running.
Page 438 Operation
Mode Change
System switching Switches the systems between the control system and the
standby system to continue operation of the redundant
system when a failure or an error occurs in the control
system. For debugging and maintenance purpose, users can
switch the systems at any desired timing.
Page 441 System
Switching
Tracking transfer Transfers the control data from the control system to the
standby system and maintains the consistency of the data in
the two systems to continue operation of the redundant
system when a failure or an error occurs in the control
system.
Page 454 Tracking
Transfer
Memory copy from control system to
standby system
Transfers data such as parameters and programs in the CPU
module of the control system to the CPU module of the
standby system to maintain the consistency of the memory in
the two CPU modules.
Page 468 Memory Copy
from Control System to
Standby System
System consistency check Checks whether the system configurations and files in the
CPU modules are the same between the control system and
the standby system when the redundant system is in backup
mode.
Page 475 System
Consistency Check
Program execution in both systems Detects an error in the external device or network of the
systems (control system and standby system) by executing a
program that diagnoses external devices or networks of both
systems.
Page 479 Program
Execution in Both
Systems
Redundant function module
communication test
Checks a redundant function module for error when the
communications of the redundant function module are
unstable.
Page 487 Redundant
Function Module
Communication Test