福建宇创自动化设备有限公司

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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