描述
PLC平均的I/O点的价格还比较高,因此应该合理选用PLC的I/O点的数量,在满足控制要求的前提下力争使用的I/O点最少,但必须留有一定的裕量。
通常I/O点数是根据被控对象的输入、输出信号的实际需要,再加上10%~15%的裕量来确定。
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