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合理选择PLC的I/O点数或对在用的PLC扩展I/O点数以满足使用要求,是提高控制系统性价比的有效途径。本文从硬件电路、软件设计、硬件与软件结合三个方面阐述了可编程控制器I/O点数的扩展方法。
Reasonable choice of PLC’s I / O points or PLC expansion I / O points in use to meet the requirements, is to improve the control system cost effective way. This article elaborates the expansion method of PLC I / O points from three aspects of hardware circuit, software design, hardware and software.