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MELSEC-Q
14 SYSTEM CONFIGURATION OF MULTIPLE PLC SYSTEM
14.2.6 Parameters that enable the use of multiple PLC system
(1) Parameters that enable the use of multiple PLC system
Compared with the single CPU system, the multiple PLC system includes the
"No. of PLC", "control PLC", "refresh setting (automatic refresh setting)" of PLC
parameters.
The PLC parameters must be set to the same for all the CPU modules used in
the multiple PLC system, except some modules.
Make similar settings to the PC CPU module, if one is included, using the PC
CPU module setting utility.
For the setting method, refer to the manual of the PC CPU module.
(2) The PLC parameter settings for use with multiple PLC system
The PLC parameters, necessity of setup, and descriptions that are required for
using multiple PLC system are listed in table 14.3.
Table 14.3 Setting list for the multiple PLC and I/O Assignment
PC parameter
Necessity of
setup
1
Description
2
I/O Assignment
Type
—
Model name
—
—
Points
—
Start
—
Standard setting
Base model name
—
—
Power model name
—
—
Extension cable
—
—
Points
—
Switch settings
—
—
Detailed settings
Error time output made
—
—
H/W error time PLC operation made
—
—
I/O response time
—
—
I/O Assignment
Control PLC
PLC system
settings
Number of empty slots
—
No. of PLC
Operation mode
Online module change
The input condition outside of the group is taken
The output condition outside of the group is taken
Refresh setting
Send range for each PLC
Multiple PLC
settings
PLC side devices
—
1: Necessity of setup column
: Items that must be set up for multiple PLC system (operations not possible if not set up.)
: Items that may be set up when required for multiple PLC system (Operations carried out
with the default values when not set up.)
—: Items that are the same as single CPU systems.
2: Descriptions
: Items that have the same settings for all CPU modules on the multiple PLC system.
: Items that have the same settings for all High Performance model QCPUs and PC CPU
module on the multiple PLC system (items that do not have settings for motion CPUs).
—: Items that can be setup up individually for each CPU modules on the multiple PLC system.