IC693CMM321-JJ
结构合理.对于工艺过程比较固定、环境条件较好(维修量较小)的场合,选用整体式结构PLC,其他情况则选用模块式结构PLC。
功能、规模相当.对于开关量控制的工程项目,对其控制速度无需考虑,一般的低档机就能满足要求。对于以开关量控制为主,带少量模拟量控制的工程项目,可选用低档机。对于控制比较复杂,控制功能要求更高的工程项目,例如要求实现PID运算、闭环控制、通信联网等,可视控制规模及复杂的程度选用中档或*机。其中*机主要用于大规模过程控制、全PLC的分布式控制系统以及整个工厂的自动化等。
机型统一.一个大型企业应尽量做到机型统一。因为同一机型的PLC,其模块可互换,便于备用品、备件的采购和管理;其功能及编程方法统一,有利于技术力量的培训、技术水平的提高和功能的开发;其外部设备通用,资源可共享,配以上位计算机后,可把控制各独立的系统的多台PLC连成一个多级分布式控制系统,相互通信,集中管理。 PLC的容量包括用户存储器的存储容量(字数)和I/O点数两方面的含义。PLC容量的选择除满足控制要求外,还应留有适当的裕量以作备用。
通常,一条逻辑指令占存储器一个字,计时、计数、移位以及算术运算、数据传送等指令占存储器两个字。各种指令占存储器的字数可查阅PLC产品使用手册。
在选择存储器容量时,一般可按实际需要的25%考虑裕量。通常I/O点数可按实际需要的10%~15%考虑裕量。
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