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1 OVERVIEW
1.4 Multiple CPU System
1.4.1 Overview
(1) Multiple CPU System
Multiple (up to 4 modules) PLC CPUs and Motion CPUs are installed to the CPU
base unit, and each CPU controls the I/O modules and intelligent function
modules of the CPU base unit/extension base unit slot by slot in the Multiple
CPU system.
Each Motion CPU controls the servo amplifiers connected by SSCNET cable.
(2) Distributed system configuration
(a) By distributing such tasks as servo control, machine control and information
control among multiple processors, the flexible system configuration can be
realized.
(b) You can increase the number of control axes by using a multiple Motion
CPUs. It is possible to control up to 96 axes by using three Q173CPU(N)s.
(c) You can reduce the PLC scan time of the overall system by using a multiple
PLC CPUs and distributing the PLC control load among them.
(3) Communication among the CPUs in the Multiple CPU system
(a) Transmission of data among the CPUs in the Multiple CPU system is
performed automatically using the multiple CPU automatic refresh function.
This makes it possible to use the device data of the other CPUs as the
device data of the self CPU.
(b) You can access the device data and start the Motion SFC program from the
PLC CPU to the Motion CPU by Motion dedicated PLC instruction.