描述

6DR2100-4

DCS與PLC的區(qū)別要點
1. DCS是一種“分散式控制系統(tǒng)”，而PLC (可編程控制器) 只是一種控制“裝置”，兩者是“系統(tǒng)”與“裝置”的區(qū)別。系統(tǒng)可以實現(xiàn)任何裝置的功能與協(xié)調(diào),PLC裝置只實現(xiàn)本單元所具備的功能.
2. 在網(wǎng)絡(luò)方面,DCS網(wǎng)絡(luò)是整個系統(tǒng)的中樞神經(jīng)，它是安全可靠雙冗余的高速通訊網(wǎng)絡(luò)，系統(tǒng)的拓展性與開放性更好.而PLC因為基本上都為個體工作，其在與別的PLC或上位機(jī)進(jìn)行通訊時，所采用的網(wǎng)絡(luò)形式基本都是單網(wǎng)結(jié)構(gòu)，網(wǎng)絡(luò)協(xié)議也經(jīng)常與國際標(biāo)準(zhǔn)不符。在網(wǎng)絡(luò)安全上，PLC沒有很好的保護(hù)措施。我們采用電源,CPU,網(wǎng)絡(luò)雙冗余.
3. DCS整體考慮方案,操作員站都具備工程師站功能,站與站之間在運行方案程序下裝后是一種緊密聯(lián)合的關(guān)系，任何站、任何功能、任何被控裝置間都是相互連鎖控制, 協(xié)調(diào)控制;而單用PLC互相連接構(gòu)成的系統(tǒng)，其站與站（PLC與PLC）之間的聯(lián)系則是一種松散連接方式，是做不出協(xié)調(diào)控制的功能。
4. DCS在整個設(shè)計上就留有大量的可擴(kuò)展性接口，外接系統(tǒng)或擴(kuò)展系統(tǒng)都十分方便，PLC所搭接的整個系統(tǒng)完成后，想隨意的增加或減少操作員站都是很難實現(xiàn)的。
5. DCS安全性：為保證DCS控制的設(shè)備的安全可靠，DCS采用了雙冗余的控制單元，當(dāng)重要控制單元出現(xiàn)故障時，都會有相關(guān)的冗余單元實時無擾的切換為工作單元，保證整個系統(tǒng)的安全可靠。PLC所搭接的系統(tǒng)基本沒有冗余的概念，就更談不上冗余控制策略。特別是當(dāng)其某個PLC單元發(fā)生故障時，不得不將整個系統(tǒng)停下來，才能進(jìn)行更換維護(hù)并需重新編程。所以DCS系統(tǒng)要比其安全可靠性上高一個等級。
6. 系統(tǒng)軟件，對各種工藝控制方案更新是DCS的一項最基本的功能，當(dāng)某個方案發(fā)生變化后，工程師只需要在工程師站上將更改過的方案編譯后，執(zhí)行下裝命令就可以了，下裝過程是由系統(tǒng)自動完成的，不影響原控制方案運行。系統(tǒng)各種控制軟件與算法可以將工藝要求控制對象控制精度提高。而對于PLC構(gòu)成的系統(tǒng)來說，工作量極其龐大，首先需要確定所要編輯更新的是哪個PLC，然后要用與之對應(yīng)的編譯器進(jìn)行程序編譯，最后再用專用的機(jī)器（讀寫器）專門一對一的將程序傳送給這個PLC，在系統(tǒng)調(diào)試期間，大量增加調(diào)試時間和調(diào)試成本，而且極其不利于日后的維護(hù)。在控制精度上相差甚遠(yuǎn)。這就決定了為什么在大中型控制項目中（500點以上），基本不采用全部由PLC所連接而成的系統(tǒng)的原因。
7. 模塊：DCS系統(tǒng)所有I/O模塊都帶有CPU，可以實現(xiàn)對采集及輸出信號品質(zhì)判斷與標(biāo)量變換，故障帶電插拔，隨機(jī)更換。而PLC模塊只是簡單電氣轉(zhuǎn)換單元，沒有智能芯片，故障后相應(yīng)單元全部癱瘓。

8.現(xiàn)在高端的PLC與DCS的功能已經(jīng)差不多，DCS對網(wǎng)絡(luò)和分布式數(shù)據(jù)庫還要定時掃描有較強(qiáng)的功能，同時對運算和模擬量的處量比較拿手。
9.PLC還分大、中、小、微PLC，其中微型的只賣幾百塊到2000塊，點數(shù)也好少，大型的可以帶數(shù)千點，運算能力與DCS差不多，但對多機(jī)聯(lián)網(wǎng)功能較弱。現(xiàn)在兩個技術(shù)平臺都差不多，只是重點不一樣。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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FANUC 15 A16B-1212-0030/?02B Detector Adapter Board

FANUC A20B-2901-0985/?03A Control Module

FANUC A16B-1211-0860/?04A Memory Board

SABO MVK.530.30 Thermocouple Amplifier Module

PULNIX TM-440XC High Resolution Camera TM-440

FANUC A20B-2902-0060/?03A Axis Control Module

Yokogawa F3PU20-0N Power Supply Module

Yokogawa F3YD64-1F TR Output Module

Yokogawa F3XD64-3F DC Input Module

(10) New Allen-Bradley 595-A02 Auxiliary Contacts

Reliance Electric 0-52876 VTGA Drive Module

FANUC A16B-1212-0540/?04B Emergency Stop Control Board

FANUC A20B-2900-0107/?03A Control Module

Rexroth VT5007 Proportional Amplfier Module

NEW Siemens 3VU13 00-1MG00^

NEW Banner Engineering F02BG^

Dresser ITD PCB-SPINMOD-1B Control Module W/572243A

Fanuc A20B-2900-0500/?03B 1MB Memory Module

(6) Cutler-Hammer D40RPB D40 NC Contact Cartridges

New Magnetek/Yaskaw?a AI-14B Analog Option Card

FANUC A20B-2900-0380/?06C Control Module

Siemens 6FX1126-0BB00 Memory Module

Reliance Electric 0-52861 DCGA Module

FANUC A16B-1212-0540/?06D Emergency Stop Control Board

NEW Westinghouse AN11P Overload Relay^

NEW Siemens 3SE03-AR1^

TRICONEX 2551-1 TERMINATION PANEL

Keyence CA-DC100 Vision System Light Controller

FANUC A20B-2902-0350/?01A Control Module

FANUC A20B-2902-0290/?01A Digital Axis Control Module

MAZAK I-829038 MPS-520 I/O Control Board

FANUC A20B-2900-0380/?06C Control Module

Daytronic Model 9178 Strain Gage Conditioner Module

Daytronic Model 9130 LVDT Conditioner Module

Daytronic Model 9163 Analog Input Module

Daytronic Model 9170 Strain Gage Conditioner Module

(3) Allen-Bradley 74102-328-51 2KW Axis Slider Modules

Mitsubishi SD-N50 DC Contactor With Cover 24VDC Coil

NEW Barksdale P1H-B340 HI-P Pressure Switch^

NEW Allen-Bradley 802T-ATP1 Plug-In Limit Switch^

Allen-Bradley 7300-UOG CNC Control Board

Allen-Bradley 7300-UOJ CNC Control Board

Fisher PROVOX CRIMISCX1-A3 MPU/ROM ASSY. Board

Fisher PROVOX CP6701X1-EA1 Power Connection Board

(6) Oriental Motors SS21-UL Speed Control Module W/Base

OMRON S8VS-24024 Power Supply

Fisher PROVOX COMMONX1-AA2 Serial Interface Board

Reliance Electric 0-52839 TSSA Drive Module

Phoenix Contact QUINT-PS-100-24?0AC/24DC/5 Power Supply

Mitsubishi NF100-FHU-75 No-Fuse Circuit Breaker

Adept Tech 10300-46610 Rev. F Storage Control Board

Adept Tech 10310-70200 Rev. D Master Control Board

(6) NEW Telemecanique 28048 XVAC351 Indicating Lights

OMRON C200HW-BC081-V1 SYSMAC Base Unit

NEW Analogic ITG2600-00-0 CONTROL MASTER Meter ITG 2600

Allen-Bradley 1791-0A32/B I/O Block Output Module OA32

Atlas Copco 4240 0151-00 Servo Controller

Westinghouse NL-325 Numa-Logic Lamp Buffer Driver Board

Allen-Bradley 1785-KA3 DH+ interface Module

BR Automation 7DM465.7 DM465 Input/Output Module

FANUC A16B-1212-0540/?04B Emergency Stop Control Board

Allen-Bradley 74102-588-51 1394 Power Control Board

Micro Memory MM-6704 High Speed Static Memory Board

(10) Phoenix Contact PLC-BSC-24DC/21 Relay Terminals

Allen-Bradley 1756-IB16/A DC Input Module

GE 193X720BAG01 Gate Pulse Generator Module

NEW Square D C52E^

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