140CPU65160
140CPU65160
140CPU65160
（2） PLC控制系统的程序设计要点。PLC控制系统I/O分配，依据生产流水线从前至后，I/O点数由小到大;尽可能把一个系统、设备或部件的I/O信号集中编址，以利于维护。定时器、计数器要统一编号，不可重复使用同一编号，以确保PLC工作运行的可靠性。
程序中大量使用的内部继电器或者中间标志位（不是I/O位），也要统一编号，进行分配。
在地址分配完成后，应列出I/O分配表和内部继电器或者中间标志位分配表。
彼此有关的输出器件，如电机的正/反转等，其输出地址应连续安排，如Q2.0/Q2.1等。
（3） PLC控制系统编程技巧。PLC程序设计的原则是逻辑关系简单明了，易于编程输入，少占内存，减少扫描时间，这是PLC 编程必须遵循的原则。下面介绍几点技巧。
PLC各种触点可以多次重复使用，无需用复杂的程序来减少触点使用次数。
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