A20B-2902-0272;
供应A20B-2902-0272;
A20B-2902-0272;
设计PLC应用系统时，首先是进行PLC应用系统的功能设计，即根据被控对象的功能和工艺要求，明确系统必须要做的工作和因此的条件。然后是进行PLC应用系统的功能分析，即通过分析系统功能，提出PLC控制系统的结构形式，控制信号的种类、数量，系统的规模、布局。*根据系统分析的结果，具体的确定PLC的机型和系统的具体配置。
PLC控制系统设计步骤：
1.熟悉被控对象，制定控制方案
分析被控对象的工艺过程及工作特点，了解被控对象机、电、液之间的配合，确定被控对象对 PLC控制系统的控制要求。
2.确定I/O设备
根据系统的控制要求，确定用户所需的输入(如按钮、行程开关、选择开关等)和输出设备(如接触器、电磁阀、信号指示灯等)由此确定PLC的I/O点数。
3.选择PLC
选择时主要包括PLC机型、容量、I/O模块、电源的选择。
4.分配PLC的I/O地址
根据生产设备现场需要，确定控制按钮，选择开关、接触器、电磁阀、信号指示灯等各种输入输出设备的型号、规格、数量;根据所选的PLC的型号列出输入/输出设备与PLC输入输出端子的对照表，以便绘制PLC外部I/O接线图和编制程序。
5.设计软件及硬件进行PLC程序设计，进行控制柜(台)等硬件的设计及现场施工。
由于程序与硬件设计可同时进行，因此，PLC控制系统的设计周期可大大缩短，而对于继电器系统必须先设计出全部的电气控制线路后才能进行施工设计
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