2 MULTIPLE CPU SYSTEM
2. MULTIPLE CPU SYSTEM
2.1 Multiple CPU System
2.1.1 Overview
(1) What is Multiple CPU system ? | 2 |
A Multiple CPU system is a system in which more than one PLC CPU module and Motion CPU module (up to 4 modules) are mounted on several main base unit in order to control the I/O modules and intelligent function modules.
Each Motion CPU controls the servo amplifiers connected by SSCNET cable.
(2)System configuration based on load distribution
(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 CPU modules.
It is possible to control up to 96 axes by using the three CPU modules (Q173DCPU).
(c)By distributing the
(3)Communication between CPUs in the Multiple CPU system
(a)Since device data of other CPUs can be automatically read by the automatic refresh function, the self CPU can also use them as those of self CPU. (Note): When the High performance PLC CPU module/Process CPU
module/PC CPU module/C controller module is mounted in the combination of Multiple CPU system, the Motion dedicated PLC instruction from these modules cannot be executed.
(b)Motion dedicated PLC instructions can be used to access device data from the PLC CPU to Motion CPU and start Motion SFC program.
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