描述
系统软件，对各种工艺控制方案更新是DCS的一项最基本的功能，当某个方案发生变化后，工程师只需要在工程师站上将更改过的方案编译后，执行下装命令就可以了，下装过程是由系统自动完成的，不影响原控制方案运行。系统各种控制软件与算法可以将工艺要求控制对象控制精度提高。而对于PLC构成的系统来说，工作量极其庞大，首先需要确定所要编辑更新的是哪个PLC，然后要用与之对应的编译器进行程序编译，最后再用专用的机器（读写器）专门一对一的将程序传送给这个PLC，在系统调试期间，大量增加调试时间和调试成本，而且极其不利于日后的维护。在控制精度上相差甚远。这就决定了为什么在大中型控制项目中（500点以上），基本不采用全部由PLC所连接而成的系统的原因。
模块：DCS系统所有I/O模块都带有CPU，可以实现对采集及输出信号品质判断与标量变换，故障带电插拔，随机更换。而PLC模块只是简单电气转换单元，没有智能芯片，故障后相应单元全部瘫痪。
现在高端的PLC与DCS的功能已经差不多，DCS对网络和分布式数据库还要定时扫描有较强的功能，同时对运算和模拟量的处量比较拿手。
PLC还分大、中、小、微PLC，其中微型的只卖几百块到2000块，点数也好少，大型的可以带数千点，运算能力与DCS差不多，但对多机联网功能较弱。
产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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