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PLC programmable controller detailed explanation
Hello everyone, in the last issue we talked about the PLC programmable controller detailed explanation, then we will give you a detailed introduction of DCS and advantages and disadvantages, please see below:
DCS (Distributed Control System) is a control system widely used in the field of industrial automation, which is based on the microprocessor and integrates 4C technologies such as computer, communication, display and control to achieve centralized monitoring, decentralized control and hierarchical management of the production process. The following is a detailed analysis of the DCS distributed control system:
I. Basic definition
DCS is the English abbreviation of distributed control system, and it is also called distributed control system in the domestic automatic control industry. Compared with the centralized control system, it is a new type of computer control system, which connects each control unit together through the communication network to realize the decentralized control and centralized management of the production process.
Second, the development process
Since its birth in the mid-1970s, DCS systems have gone through three major stages of development:
The first stage: the microprocessor-based control unit realizes decentralized control and centralized monitoring and operation through the CRT display. This period of DCS system performance is not very perfect, but already has the basic decentralized control and centralized management functions.
The second stage: with the increase of microprocessor bits and the improvement of CRT display resolution, the hardware performance of DCS system has been significantly improved. At the same time, the strengthening of the modular system and the strengthening of the system information management function make the DCS system more reliable and flexible.
The third stage: DCS system introduced the open system management, real-time multi-user multi-task operating system and other advanced technologies to further improve the performance and scalability of the system. At this stage, the DCS system has been able to realize the automatic management of a variety of production and operation information, and has become the mainstream of automatic control in process industry.
Three, the main characteristics
1, decentralized control: DCS system will disperse the control function to each microprocessor, to achieve decentralized control of the production process. This decentralized control method improves the reliability and flexibility of the system, and even if a microprocessor fails, it will not affect the operation of the entire system.
2, centralized operation: Although the control function is decentralized, the DCS system connects the various microprocessors together through a communication network to achieve centralized operation and management of the production process. This allows the operator to easily monitor and operate the entire production process, improving work efficiency.
3, hierarchical management: DCS system through the formation of multi-level control structure (such as process control level, centralized monitoring level and production management level), to achieve hierarchical management of the production process. This management mode makes the system more flexible and efficient, and can be flexibly configured and adjusted according to different production needs.
4, high reliability and security: DCS system adopts a variety of reliability measures such as redundancy design, fault diagnosis and recovery to ensure the stability and reliability of the system. At the same time, the system supports functions such as hot backup and redundancy design, and can automatically switch to the standby device or backup system to continue running when the device fails.
5, openness and scalability: DCS system adopts open system architecture and standardized communication protocols, making the system has good openness and scalability. Users can choose different hardware and software devices according to their needs to achieve flexible configuration and expansion of the system.
Four, components
DCS system generally consists of the following parts:
1, the field control level: also known as the data acquisition device, mainly responsible for the process of non-control variables for data acquisition and preprocessing, and the collected data transmission to the monitoring computer. At the same time, the output device can output computer control commands to the terminal components in the form of switching or analog signals when there is a host computer.
2, process control level: also known as the field control unit or basic controller, is the core part of the DCS system. It accepts the signal from the field control level, performs the control law calculation according to the process requirements, and then sends the result as a control signal to the equipment of the field control level.
3, operator station: is the operator and DCS system exchange information platform. The operator monitors and controls the production process through the operator station, which allows the operator to learn about the production operation and adjust the control parameters through the screen.
4, management level (optional) : also known as the upper computer or management level computer, powerful, fast, large capacity. It is connected to the high-speed data path through a special communication interface, which integrates the monitoring of the system units and manages all the information of the whole system. This level is aimed at administrative or operations managers and provides global monitoring and management functions.
5. Application Scenarios
DCS system plays an important role in the field of industrial automation with its unique characteristics of decentralized control, centralized operation and hierarchical management. It is widely used in chemical industry, petroleum, water treatment, power plant, metallurgy and other industries to achieve the monitoring, control and management of the entire process.
6. Advantages and Disadvantages
advantage
◆ Rich functions: integrated a variety of technologies, powerful and comprehensive.
◆ High reliability: redundant design and fault tolerance technology are adopted to ensure the stability and reliability of the system.
Easy to expand and maintain: modular design makes the system easy to expand and configure; The self-diagnosis function reduces maintenance difficulty and cost.
◆ Friendly man-machine interface: Provide intuitive and easy-to-use man-machine interface to facilitate the operator to monitor and manage.
shortcoming
◆ High cost: The integration of a variety of advanced technologies and equipment leads to high initial investment costs.
◆ Greater reliance on the communication network: the quality and stability of the communication network are crucial to the normal operation of the system.
◆ Complex maintenance: Complex system structure and highly integrated technology increase the difficulty and complexity of maintenance.
◆ Fast technology update: It is necessary to continuously invest funds to upgrade technology and update equipment to maintain the advanced nature of the system.
The above is the detailed explanation of DCS (Distributed Control System, Distributed Control System), including advantages and disadvantages, development background and main characteristics, etc., what else do you not understand? You can send a private message in the background! Each issue will draw out the questions in the background to answer oh, we will look forward to the next issue is which lucky little cute, everyone see you next time!

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Sharnoa Tiger CS Circuit Board SE-158K _ SE158K _ SE 158K

Sharnoa Tiger CS Circuit Board SE-162_ SE162

Sharnoa Tiger CS Circuit Board SE-176L_SE176L

Sharnoa Tiger CS Circuit Board SE300-1 _ SE3001 _ SE3OO-1 _ SE3OO1_ SE-300-1

Sharnoa Tiger CS Circuit Board SE-63K _ SE63K

Sharnoa Tiger IV (4) CNC Control PC Board, SE300-l, SE300-1_SE300-I

Sharnoa Tiger P.S. Circuit Board SE-171K _ SE171K _ SE 171K

Sharnoa Tiger PS Circuit Board PCB SE300-1 _ SE3001 _ SE3OO-1 _ SE3OO1_ SE-300-1

Sharnoa Tiger PS Circuit Board SE-148K _ SE148K

Sharnoa Tiger PS Circuit Board SE-151K _ SE151K _ SE 151K

Sharnoa Tiger SC Circuit Board SE-179 _ SE179

Sharp JW-213S AC Output Module Board JW213S_Rated Load Voltage: 100-240 VAC

Sharp JW-28KB Basic Rack Panel Chassis Circuit Board _ JW28KB

SHARP MAIN BOARD 3665-0062-0150(2A) 0171-2271-5502

Shibaura Circuit Board CPR1AP01 2-A with Floppy Drive CPR1AP012A

Shibaura Circuit Board CSC3CP01 3 _ CSC3CP013 _ PCB N7515G1 _ 362264

Shibaura Circuit Board H2281701_ H22817O1 _ PCB

Shibaura CNC PCB Circuit Board H0803100 _ ZCC4A0 _ N6701-F

Sieb & Meyer 26.44.0052 _ 26440052 Circuit Board PCB_26440052_B950103H_L950103H

SIEB & MEYER 43.01.06A, SIEB & MEYER CSS 90 43.01.06A Spindle Output Board

SIEB & MEYER AFS K260482-23 R-SERVO-2.1 CIRCUIT BOARD

Sieb & Meyer Back Plane/Circuit Board 26.36.07.2 _ 2636072 _ B870212 _ L870212

SIEB & MEYER CSS90 I/O PC BOARD 43.01.05.2

SIGMA 0C950-501-01 OPTION MEMORY CARD

SIGMA F1616A HL6888 AT1782-3 CIRCUIT BOARD PACIFIC SCIENTIFIC

SIGNODE PCB TP501B BOARD

SILENT KNIGHT 051050E .2 SN 32934 2051015E CIRCUIT BOARD FIRE ALARM CARD

Silent Knight 204820L Fire Alarm Board Card

Silent Knight 4815 Driver Board for Fire Alarm Panel

Silent Knight Fire Alarm Panel Subassembly Circuit Board Unit 052080R

Silicom Single Serial PCMCIA Card OVP

Silver Cloud Operator Keyboard Keypad 13-50202N01_1350202N01_13-5O2O2NO1

Simatic Circuit Board w/ Memory Card 6ES5921-1AA21_6ES5370-0AA41

SIMPLEX   4100-0622 DIGITAL AUDIO RISER 742-535 CIRCUIT BOARD

SIMPLEX 0566075 566-075 REV F EXPANSION POWER SUPPLY CIRCUIT BOARD CARD UNIT

Simplex 2100-2120 DC Communication Board Assy 562-913D / 562-912B Fire Alarm

Simplex 2120 562-445H 562-445 H E10-87 Digital Controller Board **

Simplex 2120 Annunciator Board 562-184S 562-184-S

Simplex 2120 Expansion Card Board 562-173D 562-173-D

Simplex 2120 STD Relay Board 562-322H 562-322-H Panel

Simplex 2120 STD Relay Board 562-322J 562-322-J Panel

Simplex 4005-9824 Circuit Board Fire Alarm

SIMPLEX 4009-9808 NAC CLASS A ADAPTOR OPTION CARD 566-812

SIMPLEX 4009-9813 Remote Transponder TIC Interface Card Fire Alarm 0743801

Simplex 4020 Master Controller 565-209 Fire Alarm Circuit Board * LED Missing*

Simplex 4100 Communications Board 562-793H 562-793-H

Simplex 4100 Communications Board 562-793Q 562-793-Q REV Q

Simplex 4100 Panel Board 562-805B 0562805 REV B 16 LED 8 SWITCH CIRCUIT BOARD

Simplex 4100 Panel Board Card 565-333E 565-333-REV E UT MASTER CONTROLLER

Simplex 4100 Panel Board Interface 565-047D 565-047-D

Simplex 4100 Panel Card 562-789 K 0598 graphic 1 assy

SIMPLEX 4100 UT MASTER UNIVERSAL MOTHERBOARD 565-274 C 565274C CARD BOARD

SIMPLEX 4100-0623 NAR CONTROLLER MODULAR 742-522 BOARD  BOX

SIMPLEX 4100-3107 IDNET 4100 MODULE CARD 4100U 250 DEVICE * *

SIMPLEX 4100-5116 566-488 566-489 4100U XSIG CIRCUIT BOARD CARD

SIMPLEX 4100-6072 SM Fiber Modem Board Left Port Box   743-716

SIMPLEX 4100-6073 SM Fiber Modem Right Port Card Fire Alarm Board 743-717

SIMPLEX 4120 NET MODULAR BOARD PANEL CARD 565-649A

SIMPLEX 4120 NPU FRONT PANEL CARD 565-442

Simplex 4190-9821 MODULAR NET INTERFACE CARD 0743467 * BOX *

Simplex 4190-9821 MODULAR NET INTERFACE CARD 0743467 *BOX OPENED

SIMPLEX 556-207H 556207H FIRE ALARM CITY TIE MODULE BOARD

Simplex 556-272 Diode Matrix Fire Alarm Card

Simplex 556-340 Flasher/Tune Relay Fire Alarm Card

SIMPLEX 556-399 556399 Circuit Board Motherboard Card

SIMPLEX 556-526,525 FIRE ALARM PANEL FIELD WIRING BOARD

SIMPLEX 556-541B FIRE ALARM MODULE CARD

Simplex 556-607 0556-607 556607 Fire Alarm Panel Card Board

SIMPLEX 556-624 556624 Audio Circuit Switches Fire Alarm Board Card

Simplex 556-693 OSC. Control Board with Pre-Amp mixer Fire Alarm

SIMPLEX 556-696 556696 8556-696 Fire Alarm Pre-Amp Circuit Board Card

SIMPLEX 556-801 556801 8556-801 Fire Alarm Remote Mike Interface Circuit Board

SIMPLEX 556-896 4100 2120 BOARD 2 ZONE CARD

Simplex 556-896 ALARM TEST MODULE 556-895 UPDATED BOARD

SIMPLEX 556-927 Meter Delay 556927 Fire Alarm Board Card

Simplex 562-003 0562-003 562003 CPU Fire Alarm Circuit Board Card

Simplex 562-006 2001 Audio Control Board

SIMPLEX 562-009A 562009A TBL ANNUNCIATOR FIRE ALARM BOARD

Simplex 562-083 2120 DC Transmission Board

Simplex 562-086 2120 Local BT BMUX Board

SIMPLEX 562-111-U 562111U BT/FABT POWER BOARD SUPPLY UNIT

Simplex 562-222 Fire Alarm 8 LED Module board

Simplex 562-385c ET Motherboard E50-87 0562385 REV C 2120

Simplex 562-455 E-1 Power Converter Board

SIMPLEX 562-513 562513 RS232-C FIRE ALARM PANEL BOARD

SIMPLEX 562-546 562546 Pre-Amp Fire Alarm Circuit Board Card

SIMPLEX 562-569 Switch Board Assy Fire Alarm Card on/off/auto

Simplex 562-627 IAM Power Supply Monitor Board 8562-627

SIMPLEX 562-760 562-760F AUXILARY RELAY CARD BOARD

SIMPLEX 562-808 E-R POWER SUPPLY BOARD * FOR PARTS*

SIMPLEX 562-827 0562827 FIRE ALARM EXPANSION SUPPLY BOARD CARD

SIMPLEX 562-856E 562-856 E motherboard class b board **

Simplex 562-907 Amp Board Circuit Board Fire Alarm

SIMPLEX 562-952 562-952B 10 AMP AUXILARY MOTHERBOARD

SIMPLEX 565-035 SCU/RCU GRAPHIC I/O CIRCUIT BOARD

Simplex 565-045 565045 8 Pt Auxillary Relay Board Circuit Board Card

Simplex 565-158D 565-158 D 4100 Mapnet 2 Isolator Fire Alarm board

SIMPLEX 565-263 Fiber Option Card RS485

SIMPLEX 565-367 0565367 4003 FIRE ALARM POWER SUPPLY BOARD

SIMPLEX 565-413 WIRED MEDIA PANEL BOARD CARD

SIMPLEX 565-413 WIRED MEDIA PANEL BOARD CARD 4100-6056

Simplex 565-477 5PT NAC/Relay Circuit Board Fire Alarm

SIMPLEX 565-692 4120 NET INTERFACE CARD 565-695

SIMPLEX 565-773 FIRE ALARM IDNET REPEATER BOARD 565773 ON METAL MOUNT

Simplex 566-025 566025 Expansion Module Fire Alarm Board Card

Simplex Amplifier Board 562-159 power Supply Fire Alarm

Simplex DC Converter 565- Fire Alarm Panel Card

SIMPLEX FIBER OPTION CARD 566-380 REV D

SIMPLEX FIBER RECEIVER FIRE ALARM 565-902 BCD 565-903 BCD BOARD ON METAL MOUNT

SIMPLEX FIRE ALARM 0562939 562-939 ZAM BOARD

Simplex FIRE ALARM 4005 CPU BOARD 566-151C 0566151 REV LCD MAIN DISPLAY

SIMPLEX FIRE ALARM 4009T TRIPLE-T CLASS A BOARD 565-992 4009-9812

SIMPLEX FIRE ALARM 4100-1259 BOX !! CONSTANT SUPRV NAC 25V BOARD

SIMPLEX FIRE ALARM 4120 NET INTERFACE ASSY 565-694 C1 CIRCUIT BOARD

SIMPLEX FIRE ALARM 4602-7101 SCU/RCU GRAPHIC DRIVE MODULE CARD

Simplex FIRE ALARM 562-589F 0562589 REV F AUDIO RELAY BOARD

SIMPLEX FIRE ALARM 562-808 J 0562-808 POWER SUPPLY CIRCUIT BOARD

SIMPLEX FIRE ALARM 565-718 POWER SUPPLY BOARD TRANSFORMER ON 628-906 MOUNT

SIMPLEX FIRE ALARM AMPLIFIER CONTROL BOARD 562-159 562159 CARD

Simplex Fire Alarm Board 562-171 Switch LED Card

Simplex Fire Alarm Board 562-514 RED Switch LED Card

Simplex Fire Alarm Charger Module Circuit Board Card 556-519 556519

SIMPLEX FIRE ALARM CIRCUIT BOARD 556-218 ECCC6 94VO04-79 DUAL NORMALLY OPEN

Simplex Fire Alarm Circuit Board 562-917 Amplifier Power Supply

Simplex Fire Alarm Circuit Board 565-213 UT Motherbaord

Simplex Fire Alarm Circuit Board Card 4020/4002 Net Module w/565-413 Media

Simplex Mapnet 2 562-939 Zam Board with IAC Adapter 566-367 Circuit Board Card

Simplex Mapnet 562-594E Zam Board Assy 2120 panel card

Simplex Mapnet 562-594F Zam Board Assy 2120 panel card

Simplex Master Motherboard Card Assy 5662-854B EP-6 94 V-O

Simplex Monitor Security Board 565-073 565073 8 LED Switch Board Module

Simplex panel card 4100 565-333F 565-333-F

Simplex Power Supply Circuit Board Card 556-707 556707 0556-707

Simplex Power Supply Unit 562-137D BOARD WITH CAPACITOR

SIMPLEX PROCESSOR ASSY 565 565-714E CIRCUIT BOARD CARD

SINGLE PHASE EDP408-20 EXPOLSION PROOF 100 AMP PANEL 125V/250V PANELBOARD 240V

Sitra Automation_Automazione Circuit Board PCB 1708 PR A_1708 PR B

Sitra Circuit Board 1326 AD _ 1326AD _ PCB

Sitra Circuit Board PCB 1708 RA E2 B _ 1708RAE2 B

SKAN-A-MATIC 221040 BOARD MODULE REV.M 421004 - REFURBISHED -

Slicer Interface Board 825-8026 Rev B _ 8258026 _ 825-8O26 _ 8258O26

Smart RAM Card SM364SCSM83DL15 _ 060697-20

SMARTS / AUDIOCODES 16 PORT PASSIVE TERMINATE CARD 910-0803-001 AI-LOGIX

Socket Ruggedized Serial I/O PC Card SL0707-078 GEB

Socket Ruggedized Serial I/O PC Card SL0707-078 OVP

Sodick A7C Wire EDM Circuit Board MDR-001B MDR001B

Sodick Circuit Board ATM-001B_ATM001B_ATM-OO1B_ATMOO1B_3 Repairs or Revisions

Sodick Circuit Board EG0-C_EG0C_EGO-C_EGOC_2 Repairs or Revisions

Sodick Circuit Board G4-001C-2 _ G4001C2 _ G4OO1C2 _ G4-001C-Z _ G4001CZ

Sodick Circuit Board GATE-G4-001B-2 _ GATEG4001B2 _ GATE-G4-OO1B2 _ GATEG4OO1B2

Sodick Circuit Board GATE-G4-001C _ GATEG4001C _ GATE-G4-OO1C _ GATEG4OO1C

Sodick Circuit Board IFC-001B _ IFC001B _ IFC-OO1B _ IFCOO1B

Sodick Circuit Board MDR-W01-A _ MDRW01A _ MDR-WO1-A _ MDRWO1A _ MDK

Sodick Circuit Board P30-02-1 _ P30021 _ P3O-O2-1 _ P3OO21

Sodick Circuit Board PCB M56-01-1 _ M56011 _ On-Board Battery 3-25IFT-C _325IFTC

Sodick Circuit Board PMLATCH-E _ PMLATCHE _ 2 Repairs/Revisions

Sodick Circuit Board RM-001C _ RM001C _ RM-OO1C _ RMOO1C

Sodick Circuit Board SERVO 8 G4-001C-2 CNC Wire Ram EDM 8G4001C-2_8G4001C2

Sodick Circuit Board w/Heat Sink 1Z330X4(37) _ 1Z33OX4(37) _ 1Z330X437_1Z33OX437

Sodick Circuit Board WD-001D _ EDM WD001D _ WD-OO1D _ WDOO1D