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This chapter describes data communications among CPU modules in a multiple CPU system.

The following table lists the communication methods available among CPU modules.

Communications using the CPU shared 
memory

Data communications is performed among CPU modules using 
the internal memory of each CPU module.

Auto refresh
(using the auto refresh area)

Data communications is automatically performed among CPU 
modules in accordance with the settings in the programming 
tool.

Auto refresh
(using the multiple CPU high-speed 
transmission area)

By programs

Data communications is performed among CPU modules by 
executing programs.

Communications by motion dedicated 
instructions

Data communications is performed between a QCPU and a 
Motion CPU by executing motion dedicated instructions.

Communications among CPU modules by 
dedicated instructions

Data communications is performed among CPU modules by 
executing dedicated instructions.

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Reading/writing device data between 
QCPU and Motion CPU

Device data are read/written between a QCPU and a Motion 
CPU.

Starting an interrupt program from 
QCPU to C Controller module/PC 
CPU module

An interrupt program is started from a QCPU to a C Controller 
module/PC CPU module.

Reading/writing device data between 
QCPUs

Device data are read/written between Universal model QCPUs 
(except the Q00UCPU, Q01UCPU, and Q02UCPU).