4351A
选择PLC的基准：
数量——对于装备制造厂商而言，单一装备（同样的硬件配置和程序）月生产量500台以下就可以考虑使用PLC，如果超过了这个数量就可以考虑使用专用PLC或者单片机开发的专用控制器。
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。
可靠性——PLC产品的可靠性与设计、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，所以在可靠性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日本三菱的，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。
厦门岳航计算机工程有限公司
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