品牌——各成熟厂商PLC的功能差别不大,品牌的选择更多的是考虑服务和宣传,这需要装备制造厂商根据自己的定位来选择,但品牌在PLC的价值中占有较大有份额,同样点数,同样功能的PLC,不同品牌的价格会有数倍至十倍的差别。
功能——功能的选择不是越多越好,许多功能大多数用户都用不上,但是有一些功能又是PLC的可选功能,比方说实时时钟、电池、RS485、扩展接口等,一般基本功能的PLC价格会很低,但如果选择增加功能价格就会高很多。
可靠——PLC产品的可靠与设计、器件、制造工艺相关系,同时也与用户的使用环境和习惯有关系,德维森的V80系列在军品上有相当多的应用,所以在可靠方面完全是没有问题的。
价格——价格的高低对于量比较大的装备厂来说是选取的关键点,但价格从来都不是PLC的考虑点。
习惯——因为各家PLC的编程习惯均有不同,我们发现很多装备厂商工程师在学生时代学的教程就是三菱的,所以习惯上更偏向于日系品牌,但日系编程习惯并不是好的,认真学习PLC厂商提供的手册是加快了解和学习一种新PLC的关键。
七十年代开始从传统使用仪表和继电器组对应的两个不同应用领域(过程和顺序控制领域)派生出来DCS和PLC两类产品。这两类产品在初期确有相当多的不同,DCS对于模拟量回路控制这一块更为重视,而PLC对于离散的逻辑控制更为拿手。当时的DCS使用通用,采用解释方式处理程序,而PLC依靠类拟于AMD2910的位块处理器处理逻辑,相对而言在系统结构上,DCS更偏向PC,而PLC更像传统的硬件继电器组(位处理器)。
PLC与DCS在经过数十年的并行发展后,突然大家发现DCS和PLC的概念含糊不清了,因为PLC也在体系中加入了通用型的,也大量的使用的DCS或者PC的各种软硬件技术,特别软逻辑PLC在指令处理原理方面与DCS并无二样,只是上位机软件的用户指令不同而已。当然DCS也不是原地不动,DCS在网络通信方面、多DPU协同工作方面、冗余方面都有了长足的发展,并广泛的采用了基于X86的PC_BASE体系架构,充分利用了PC的技术成果。
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