2.1. Central processing unit (CPU Central Processing Unit):
CPU for processing, perform complex control functions of PLC important. Each
PLC is usually one to two central processing units.
CPU is usually divided into two categories: processing unit, "a bit" and processing unit "words":
- Processing Unit "a bit" only applicable for small applications, simple, merely handle
ON / OFF so simple structure, long processing time.
- Processing Unit "words": Capable of handling fast digital information, text, math, measuring
instruments, evaluation, testing should hardware structure is more complex but the processing time
is improving faster.
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