The difference between the three major control systems of DCS, PLC and FCS 

We already know that FCS is developed from DCS (Siemens 6ES7322-1HH01-0AA0 SIMATIC S7-300 Digital Output Module)

and PLC(Allen Bradley 1785-L60B Enhanced Ethernet Controller). FCS (B&R X20CS1070 Communication Module)not only

has the characteristics of DCS and PLC, but also takes a revolutionary step. 

At present, new DCS and new PLC have a tendency to move closer to each other. The current DCS has a strong sequence

control function; and the new PLC is not bad in handling closed-oop control, and both can form a large network. The scope of application of DCS and PLC has a great overlap.

1. Main points of difference

1. DCS (Siemens 6ES7407-0KA02-0AA0 SIMATIC S7-400 Power Supply)

The key to the DCS system is communication. It can also be said that the data highway is the spine of the distributed control

system DCS. Since its task is to provide a communication network between all components of the system, the design of the

data highway itself determines the overall flexibility and security. The media of the data highway can be: twisted pair, coaxial

cable or fiber optic cable.

The relative strengths and weaknesses of a particular DCS system can basically be understood through the design parameters

of the data highway.

TO BE CONTINUED...FOR more information, contact with Vivi (sh_plc@163.com).