Differences of DCS, PLC and FCS in system 

The key points of FCS are the following three points.

(1) The core of the FCS system is the bus protocol, that is, the bus standard.--B&R X20HB2880 Hub Expansion Module

For a type of bus, as long as its bus protocol is determined, the relevant key technologies and related

equipment are also determined.--Allen Bradley 1756-IF8H Analog Input Module. As far as the basic 

principles of its bus protocol are concerned, all types of buses are the same, and they all solve the problem 

of bidirectional serial communication. Digital communication transmission is the basic basis. However, due 

to various reasons, there are great differences in the bus protocols of various buses.--Siemens 6ES7231-0HC22-0XA0 SIMATIC S7-200 Analog Input Module

In order to make the fieldbus meet the requirements of interoperability and make it a real open system, 

the original IEC international standard, --Allen Bradley 1794-IE8 Analog Input Module.in the user layer of fieldbus communication

protocol simulation, clearly stipulates that the user layer has the function of device description. In order to achieve interoperability, 

each fieldbus device is described with a device description DD. DD can be regarded as a driver of the device, which includes all

necessary parameter descriptions and operation steps required by the master station. 

Because the DD includes all the information needed to describe the communication of the device and is independent of the master

station, it can realize the real interoperability of the field devices.

The interested persons of mentioned parts may relate with me, price liberally.------

Vivi (sh_plc@163.com).