Yaskawa MP920 User's Manual Design - Manual (Page 443)

9 Multi-CPU System
9.2.2 Setup Procedure Using the MPE720
9-16
If the settings for CPU Module 1 and CPU Module 2 are different, the transmission parame-
ters of the Control CPU Module will be used.
iii) I/O Map Allocations
Allocate outputs (HO or LO) only in the Control CPU Module. If the outputs are
allocated in both CPU Modules, it will be impossible to tell which CPU Module
will output data. In the Module Setting Window for the Sub CPU Module, set
“NA” in the scan setting (SCAN) of the output data so that the output section of
the Sub CPU Module will be disabled.
For input allocations (HI/LI), there will be no problem in input signals to CPU
Module 1 and CPU Module 2 as long as the input is in units of bits or words.
When a synchronized scan is specified, the inputs to CPU Module 1 and CPU
Module 2 will be concurrent. However, if synchronization is not specified, inputs
may not be concurrent.
The input signals in the Control CPU Module are concurrent within one scan,
however, signals in the Sub CPU Module will be concurrent only within individ-
ual registers.
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