V7768-320001 350-9301007768-320001 A2 Other MAP SBC

Description

There are a variety of control products with different names. The commonly used control products include DCS and PLC. We have extended the concept of DCS to FCS. DCS (Distributed Control System), also known as Distributed Control System. PLC (Program Logic Control), a programmable logic controller.

FCS (FieldBus Contor System), Field Bus Control System
Until now, there is no strict boundary between DCS and PLC. In the eyes of most people, the large system is DCS, while the small system is called PLC. Of course, it’s not impossible to say that, but it’s not right yet. Now let’s re-establish this concept.

Firstly, what is the difference between DCS and PLC?
1. In terms of development, DCS has evolved from traditional instrument panel monitoring systems. Therefore, DCS is inherently more focused on instrument control, such as the YOKOGAWA CS3000 DCS system we use, which does not even have a limit on the number of PIDs (PID, proportional differential integration algorithm, is the standard algorithm for closed-loop control of regulating valves and frequency converters, and the number of PIDs usually determines the number of regulating valves that can be used). PLC evolved from traditional relay circuits, and the initial PLC did not even have the ability to handle analog quantities. Therefore, PLC emphasized the ability to perform logical operations from the beginning.

2. From the perspective of system scalability and compatibility, there are many control products in the market, including DCS and PLC, which are produced and sold by many manufacturers. For PLC systems, there is generally no or very little demand for expansion, as PLC systems are generally designed for equipment use. Generally speaking, PLCs also rarely have compatibility requirements, such as the requirement for resource sharing between two or more systems, which is also very difficult for PLCs. Moreover, PLCs generally adopt dedicated network structures, such as Siemens’ MPI total linear network, and even adding an operator station is not easy or costly.

In the development process of DCS, various manufacturers have their own systems, but most DCS systems, such as Yokogawa YOKOGAWA, Honeywell, ABB, and so on, although the communication protocols within the system (process level) are not the same, the network platforms at the operation level all choose Ethernet networks and use standard or modified TCP/IP protocols. This provides convenient scalability. In this type of network, both the controller and the computer exist as one node, and as long as the network reaches the desired location, the number of nodes can be increased or decreased and the location of nodes can be arranged at will. In addition, based on open protocols such as OPC and DDE in Windows systems, various systems can also communicate conveniently to achieve resource sharing.

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