PLC控制系统一般设计方法:
1、分析控制系统的控制要求
熟悉被控对象的工艺要求,确定必须完成的动作及动作完成的顺序,归纳出顺序功能图。
2、选择适当类型的PLC
根据生产工艺要求,确定I/O点数和I/O点的类型(数字量、模拟量等),并列出I/O点清单。
进行内存容量的估计,适当留有余量。根据经验,对于一般开关量控制系统,用户程序所需
存储器的容量等于I/O总数乘以8;对于只有模拟量输入的控制系统,每路模拟量需要100个存
储器字;对于既有模拟量输入又有模拟量输出的控制系统,每路模拟量需要200个存储器字。
确定机型时,还要结合市场情况,考察PLC生产厂家的产品及其售后服务、技术支持、网络通信
等综合情况,选定性能价格比好一些的PLC机型。
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