1756-HSC

1756-HSC   PLC在90年代已经形成微、小、中、大、巨型多种PLC。按I/O点数分，可分为:

　　l 微型PLC: 32 I/O

　　l 小型PLC: 256 I/O

　　l 中型PLC: 1024 I/O

　　l 大型PLC: 4096 I/O

　　l 巨型PLC: 8195 I/O

　1756-HSC　 近年来有单机支持300回路和65000点I/O的大型系统对应中型PLC以上，均采用16位~32位CPU，微、小型PLC原采用8位CPU，现在根据通讯等方面要求，有的也改用16位~32位CPU。由于I/O

1756-HSC　　64点以下PLC销售额占整个PLC的47%，64点~256点的占31%，合计位整个PLC销售额的78%，所以对微、小型PLC应多加研究。

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