1784-PCMK
1784-PCMK
1784-PCMK
1．PLC程序设计的一般步骤
(1)若所采用的PLC自带有程序，应该详细了解程序已有的功能和对现有需求的满足程度和可修改性。尽量采用PLC自带的程序。
(2)将所有与PLC相关的输入信号(按钮、行程开关、速度及温度等传感器)，输出信号(接触器、电磁阀、信号灯等)分别列表，并按PLC内部接口范围，给每个信号分配一个确定的编号。
(3)详细了解生产工艺和设备对控制系统的要求。画出系统各个功能过程的工作循环图或流程图、功能图及有关信号的时序图。
(4)按照PLC程序语言的要求设计梯形图或编写程序清单。梯形图上的文字符号应按现场信号与PLC内部接口对照表的规定标注。
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