6
FUNCTIONS
6.1 Function List
6
- 4
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication with
Intelligent Function
Module
8
Parameters
* 1 : Refer to the following manual.
QnPRHCPU User's Manual (Redundant System)
Table6.2 CPU module function list (Continued)
Item Description
CPU module
Reference
section
1) 2) 3) 4)
Redundant function
This function configures a redundant system including
two sets of CPU modules, power supply modules,
network modules or main base units.
*1
System switching (between control
system and standby system)
function
This function switches between the control system and
standby system (switches the control system to the
standby system or the standby system to the control
system).
There are two different methods: system switching and
user switching.
Operation mode change
This function changes between the separate mode and
backup mode.
Tracking function
This function is used to share data between the control
system and standby system. (Transfers the control
system data to the standby system.)
If system switching occurs at the time of a control
system failure or error, control can be continued with the
same data.
Redundant online program change
function
This function transfers the data, which was written to the
control system by write to PLC or online program
change, to the standby system.
Memory copy from control system
to standby system
This function copies the program memory contents of
the control system to the standby system.
(When the standby system CPU module is replaced, the
program memory contents of the control system and
standby system can be matched.)
There are two different methods: by GX Developer and
by special relay and special register.
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