YOKOGAWA AMM22 S3

YOKOGAWA AMM22 S3 

 在有些行业，FCS是由PLC发展而来的；而在另一些行业，FCS又是由DCS发展而来的，所以FCS与PLC及DCS之间有着千丝万缕的联系，又存在着本质的差异。本文试就PLC、DCS、FCS三大控制系统的特点和差异作一分析，指出它们之间的渊源及发展方向。

   2．PLC、DCS、FCS三大控制系统的基本特点 
   目前，在连续型流程生产自动控制（PA）或习惯称之谓工业过程控制中，有三大控制系统，即PLC、DCS和FCS。它们各自的基本特点如下：

   2．1 PLC 
   （1）从开关量控制发展到顺序控制、运送处理，是从下往上的。

   （2）连续PID控制等多功能，PID在中断站中。

   （3）可用一台PC机为主站，多台同型PLC为从站。

   （4）也可一台PLC为主站，多台同型PLC为从站，构成PLC网络。这比用PC机作主站方便之处是：有用户编程时，不必知道通信协议，只要按说明书格式写就行。

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【主 营】： PLC模块 DCS系统备件· 机器人配件
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AMAT Applied materials pre-accel vendor interface Module

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AMAT 0150-76647 WIRE, JUMPER 4 PIN CONN, EMO, NEW

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AMAT Applied Materials 0090-91927 ITL XR80 Wafer Loader Interface Module Used

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AMAT 0010-31060 SWITHCH, EMO TURN TO RELEASE WITHOUT GUARD CE MARK, NEW

0020-60273, AMAT, APPLIED MATERIALS COVER RING 8i