What is the difference between DCS and PLC and FCS control system

DCS (Distributed Contorl System), distributed control system, also known as distributed control system. FCS (FieldBus Contorl System), field bus control system. PLC (Program Logic Control), programmable logic controller. Below, Xiao 7 uses two chapters to talk about the difference between FCS, DCS and PLC!

Chapter 1: The difference between FCS and DCS

Fieldbus technology: Connect all field devices with one cable

Detailed comparison of FCS and DCS

Chapter 2: The difference between DCS and PLC

Up to now, there is no strict boundary between DCS and PLC. In the eyes of most people, the big system is DCS, and the small system is called PLC. Of course, it's not impossible to say that, but it's not right. Now let's re-establish this notion.

PLC

(1) The development from switch quantity control to sequence control and transportation processing is from bottom to top;

(2) Multi-functions such as continuous PID control, PID is in the interrupt station. One PC can be used as the master station, and multiple PLCs of the same type can be used as slave stations;

(3) One PLC can also be used as the master station, and multiple PLCs of the same type can be used as slave stations to form a PLC network. This is more convenient than using a PC as the master station: when there is user programming, there is no need to know the communication protocol, just write it in the format of the manual;

(4) The PLC grid can be used as an independent DCS or as a subsystem of the DCS;

(5) PLC is mainly used for sequential control in industrial processes, and the new PLC also has closed-loop control functions.

DCS

(1) The distributed control system DCS is a monitoring technology that integrates 4C (Communication, Computer, Control, CRT) technologies;

(2) A large tree topology system from top to bottom, in which communication is the key;

(3) PID in the interruption station, the connection between the computer and the field instrumentation and control device of the interruption station is a tree topology and a parallel continuous link structure, and there are also a large number of cables from the relay station to the field instrumentation in parallel;

(4) Analog signal, A/D-D/A, mixed with microprocessor;

(5) One instrument is connected to the I/O by a pair of lines, and the control station is connected to the local area network LAN;

(6) DCS is a three-level structure of control (engineer station), operation (operator station), and field instrument (field measurement and control station);

(7) For large-scale continuous process control, such as petrochemical and so on.

Industry insiders elaborate on the difference between PLC and DCS

PLC and DCS can not be compared, PLC is a controller, is an isolated product, and DCS is a system. But the PLC can be compared with the DCS control station. The cycle period of the PLC is about 10 milliseconds, while the DCS control station is about 500 milliseconds. The PLC has better openness and has a stronger ability to work independently as a product. â€”â€”OMRON Corporation

DCS is a system including upper-level software, network and controller, while PLC is just a controller. To form a system, an upper-level SCADA system and a network connected to it are also required. For PID loop control, now Mitsubishi's process controller can also implement FBD programming like SAMA configuration; the DCS system is larger, the number of control loops is more, and there are more controls and algorithms, which can complete more complex loops. control. Hardware reliability is about the same. DCS can achieve I/O redundancy, but PLC cannot. Relatively speaking, the system cost constituted by PLC is lower. â€”â€”Manager of Mitsubishi Electric Automation Precision Control Department

DCS is a kind of "distributed control system", which includes on-site controller, operator station computer, engineer station computer, and the network system that connects them in hardware; DCS software is an overall solution, which solves all the technologies of a system The problem is that the various parts of the system are closely integrated. PLC is a device, which is equivalent to the field controller in DCS in hardware; it is a local scheme in software, and the organization between stations is loose. â€”â€”Technical manager responsible for APROL product application development at B&R

Analyzing the difference between DCS and PLC, the most important points are two points, one is that DCS is distributed control and has a global database; the other is that PLC is a sequential scanning mechanism, and DCS is time-based control. Our system conforms to the first point, such as the modification of an I/O tag, which can also be simultaneously reflected in the HMI. - Product Manager, Process Market, Rockwell Automation

Read comics, read PLC and DCS

A picture to understand what the DCS system is!

Not much to say, just look at the picture below, if you say too much, you will be confused, just look at the picture and it is easy to understand!

Let's talk about the definition of DCS first, which most people can't understand, in sharp contrast with the following:

DCS is the English abbreviation of Distributed Control System (Distributed Control System), also known as Distributed Control System in the domestic automatic control industry. It is a new type of computer control system relative to the centralized control system, which is developed and evolved on the basis of the centralized control system. Please add WeChat public account: Industrial Intelligence (robotinfo) Jack Ma is paying attention

finish the bird

Then use pictures and texts to translate into adult words

â–¼â–¼

Three hundred words Three hundred words Sabie three hundred words Three hundred words Three hundred words Three hundred words Three hundred words One hundred words Three hundred words Three hundred words Sabie three hundred words Three hundred words Three hundred words Three hundred words

Copper Dryer Filter

copper filter driers are designed to absorb moisture, acid, and to filter out impurities. Normally be installed as component and replaced as repair part for both domestic and commercial refrigerators, freezers.

This fliter is for air conditioner water tank or fridge, replacing your broken or old one.
Used in two-way circulation refrigeration system tubes
Absorb moisture and acidic harmful substances in the refrigeration system and filter impurities.
This filter dryer is fit for refrigerators (but refrigerator is not including here)

Copper Dryer Filter,Refrigeration Dryer Filter,Refrigerator Water Dryer Filter,Refrigerator Copper Filter Drier

FOSHAN SHUNDE JUNSHENG ELECTRICAL APPLIANCES CO.,LTD. , https://www.junshengcondenser.com