Yaskawa MP920 User's Manual Design - Manual (Page 442)

9.2 Setting Up a Multi-CPU System
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b) Setting the Optional Modules
The module configuration must be set according to the actually mounted Optional
Modules. All the Optional Modules that are actually mounted must be set, no matter
which CPU Module is the Control CPU Module for each Optional Module.
After setting and saving the module configuration in offline mode, the same module
configuration definition will be set in CPU Module 1 and CPU Module 2, and saved
in the MPE720.
c) Designating the Control CPU Number
Select the Control CPU Module that initializes the Optional Modules and I/O by
specifying 01 or 02.
For Motion Modules such as the SVA, SVB, and PO, always specify 01 for the Con-
trol CPU Module. If 02 is specified, operation may not be dependable.
For the Control CPU Module selection of other Modules such as I/O Modules and
Communications Modules, refer to Controlling Optional Modules in 9.1.2 Opera-
tion.
Fig. 9.11 Module Configuration Window
d) I/O Module Definitions
The definitions of the I/O Modules to be used must be set seperately in CPU Module
1 and CPU Module 2. There are some Modules whose definitions must be the same
in CPU Module 1 and CPU Module 2 because of their usage.
i) I/O Processing
The normal I/O processing of I/O Modules is executed by CPU Module 1 and
CPU Module 2 at the start of each scan. I/O data will be updated in synchroniza-
tion with the scans set in the Control CPU Module.
ii) Transmission Parameters and Link Map Allocations
The settings of transmission parameters and link map allocations used for I/O
Modules must be the same for both CPU Module 1 and CPU Module 2.