37 FUNCTIONS
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37
37
FUNCTIONS
This chapter describes the redundant functions and safety functions that can be used with the SIL2 Process CPU and the
functions that are different (modified or restricted) from those described in Part 2. Functions not described in this chapter are
the same as those described in Part 2.
For the availability of SIL2 Process CPU functions, refer to the following.
MELSEC iQ-R CPU Module User's Manual (Startup)
Function
Description
Reference
Redundant
function
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. The systems can also be switched manually by a user
for debugging or maintenance.
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.
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 637 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.
Page 642 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 647 Program
Execution in Both
Systems
Redundant function module
communication test
Checks a redundant function module for an error when its communications
are unstable.
Page 654 Redundant
Function Module
Communication Test
Safety function
Switching safety operation
mode
There are two safety operation modes: TEST MODE and SAFETY MODE.
One mode is for changing the safety program or safety parameters, and the
other is for operating the system as a safety system.
Page 655 Switching
Safety Operation Mode
Safety diagnostic function
Self-diagnostic function of the SIL2 Process CPU
Page 658 Safety
Diagnostic Function
Safety data identify check
Checks if the project data created using the engineering tool and the data in
the SIL2 Process CPU are the same, and confirms that the program executed
in SAFETY MODE is the one written by the user.
Page 658 Safety Data
Identify Check
Safety communication function
Communicates data between the SIL2 Process CPU of the control system
and modules supporting safety functions using safety protocols. Safety
communication processing is not performed in the SIL2 Process CPU of the
standby system.
Summary of Contents for MELSEC iQ-R-R00CPU
Page 2: ......
Page 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Page 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Page 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Page 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Page 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
Page 1027: ......