Integration needs:For stand-alone installations,PLC systems are ideal.When a factory is configured with multiple PLC systems,the requirement for interconnection arises.This is generally difficult to achieve because the data usually needs to be mapped using the communication protocol.There is of course no problem with integration,but when there is a change requirement,the user’s trouble will come:once a PLC system is changed,it may cause the two PLCs to fail to communicate normally,because the data mapping is affected.For the DCS system,no mapping is needed at all,and configuration changes are just a simple process;the controller comes with the system.
集成需求：对于单机装置，PLC系统是理想选择。当工厂配置多个PLC系统时，就会产生相互连接的要求。这一般很难实现，因为通常需要利用通信协议对数据进行映射。集成当然没有问题，但当有变更需求时，那用户的麻烦就来了：一旦某个PLC系统做了变更，就可能会导致两个PLC不能正常通讯，这是因为数据映射受到影响的缘故。对DCS系统而言，则根本不需要映射，配置变更只是一个简单的过程；控制器是系统自带的。
HP/Agilent 5087-7081 YIG TUNED OSCILATOR
HP/Agilent 53131A Universal Frequency Counter/Timer,5G
AVANTEK Y090-3477 YIG TUNED OSCILATOR, 2.4 ~ 13.8 GHz
HP/Agilent 85131F Flexible Cable Set, 3.5 mm (Test Port
HP/Agilent 85027A Directional Bridge, 10 MHz to 18 GHz
