IC086SLM242
IC086SLM242
IC086SLM242
PLC與繼電器接觸器控制系統(tǒng)的比較通過對鼠籠式異步電動機起制動的傳統(tǒng)控制方法和PLC控制方法的比較，從某種意義上看，PLC控制是從繼電器接觸器控制發(fā)展而來的。兩者既有相似性又有很多不同處。
3.1 二種方案的不同點
(1)PLC內部大部分采用“軟”邏輯
繼電器接觸器控制全部用硬器件、硬觸點和“硬”線連接，為全硬件控制;PLC內部大部分采用“軟”電器、“軟”接點和“軟”線連接，為軟件控制；
(2) PLC控制系統(tǒng)結構緊湊
繼電器接觸器控制系統(tǒng)使用電器多，體積大且故障率大;PLC控制系統(tǒng)結構緊湊，使用電器少，體積。
(3) PLC內部全為“軟接點”動作快
電器接觸器控制全為機械式觸點，動作慢，弧光放電嚴重;PLC內部全為“軟接點”動作快；
(4) PLC控制功能改變極其方便
繼電器接觸器控制功能改變，需拆線接線乃至更換元器件，比較麻煩;PLC控制功能改變，一般只需修改程序便可，極其方便；
(5) PLC控制系統(tǒng)制造周期短
PLC控制系統(tǒng)由于結構簡單緊湊，基本為軟件控制，因此設計、施工與調試比繼電器接觸器控制系統(tǒng)周期短。
此外，由于PLC技術是計算機控制的基礎上發(fā)展而來，因此，它的軟硬件設置上有著傳統(tǒng)的繼電器接觸器控制無法比擬的優(yōu)勢，工作可靠性極高。
3.2 PLC方案的設計要點
(1) 設置濾波
在PLC中一般都在輸入輸出接口處設置π形濾波器，它不僅可濾除來自外界的高頻干擾，而且還可減少內部模塊之間信號的相互干擾；
(2) 設有隔離
在PLC系統(tǒng)中CPU和各I/O回路(主要指數(shù)字口)幾乎都設有光耦合器作隔離，以防止干擾或可能損壞CPU等；
(3) 設置屏蔽
屏蔽有兩類:一類是對變壓器采取磁場和電場的雙重屏蔽，這時要用既導磁又導電的材料作為屏蔽層;另一類是對CPU和編程器等模塊僅作電磁場的屏蔽，此時可用導電的金屬材料作屏蔽層；
(4) 采用模塊式結構
PLC通常采用積木式結構，這便于用戶檢修和更換模板，同時在各模板上都設有故障檢測電路，并用相應的指示器標志它的狀態(tài)，使用戶能迅速確定故障的位置；
(5) 設有聯(lián)鎖功能
PLC中個各輸出通道之間設有聯(lián)鎖功能。以防止各被控對象之間誤動作可能造成的事故；
(6) 設置環(huán)境檢測和診斷電路
這部分電路負責對PLC的運行環(huán)境(例如電網電壓、工作溫度、環(huán)境的濕度等)進行檢測，同時也完成對PLC中各模塊工作狀態(tài)的監(jiān)測。這部分電路往往是與軟件相配合工作的，以實現(xiàn)故障自動診斷和預報；
(7) 設置Watchdog電路
PLC中的這種電路是專門監(jiān)視PLC運行進程是否按預定的順序進行，如果PLC中發(fā)生故障或用戶程序區(qū)受損，則因CPU不能按預定順序(預定時間間隔)工作而報警；
(8) PLC的輸入、輸出控制簡單
PLC是以掃描方式進行工作的，即PLC對信號的輸入、數(shù)據的處理和控制信號的輸出，分別在一個掃描周期內的不同時間間隔里，以批處理方式進行，這不僅使用戶編程簡單、不易出錯，而且也使PLC的工作不易受到外界干擾的影響;同時PLC所處理的數(shù)據比較穩(wěn)定，從而減少了處理中的錯誤；另外，PLC的輸入、輸出的控制較簡單，不容易產生由于時序不合適而造成的問題。
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GE SPECTRA RMS ACCESSORY 24V SHUNT TRIP DEVICE SAST3 * IN BOX*
NIB GENERAL ELECTRIC CR115A15 LIMIT SWITCH VANE OPER.
GE 2 KVA Transformer Single Phase Prim. 208 / 240 / 250 V Sec. 230 V - UNUSED!
GENERAL ELECTRIC TLICE2TD NSFP TLICE2TD
GENERAL ELECTRIC 1FRC-1 USPP 1FRC1
GENERAL ELECTRIC 1TRPW1LA USPP 1TRPW1LA
GENERAL ELECTRIC 161B77571 NSPP 161B77571
General Electric 5HP Electric Motor 5K213AG1521
General Electric Contactor Definite Purpose CR353FF3BA1
General Electric Circuit Breaker TFK236F000
GE THQL THQL2130GF1 2 POLE 30 AMP GF GFI GFCI CIRCUIT BREAKER
GE TEB132YT100 100Amp Breaker 240V
General Electric 15D5G2 115V 60Hz Coil - , No Box
6 GENERAL ELECTRIC EJ-1DD 4.76KV FUSES #9F60GJC325
General Electric IC610CBL105
General Electric IC693CHS398
General Electric 15D2G014 Coil
GENERAL ELECTRIC APN84 NSFP APN84
GE General Electric THED136100WL Breaker THED136100 3 Pole 100A 100 A Amp
General Electric Und. Lab Circuit Breaker 80 Amp, 120 VAC, 1 Pole # TED111080
GE TJK636F000 TJK636500 500A breaker
GENERAL ELECTRIC 150 AMP 3 POLE BREAKER TJJ436150 YB-101
GE GENERAL ELECTRIC 44B398607-001 PC BOARD ROPS1B 44A397899-G01
1 GENERAL ELECTRIC CR120A04002AA INDUSTRIAL RELAY NNB
General Electric 55-513696G022 Coil - , No Box
14023 GE TJK436T400 Circuit Breaker 400A 600V
General Electric GE CR306 CR306B1 Motor Starter NEMA Size 0 w/ Enclosure
GENERAL ELECTRIC 911WRCO11FB NSFP 911WRCO11FB
GENERAL ELECTRIC RT2 NSFP RT2
GENERAL ELECTRIC PMC-422 NSFP PMC422
Marathon Electric 3-Hp 4715 AC Motor 1725rpm 3-Ph 200-230/460VAC General Purpose
GENERAL ELECTRIC ML471L284 USPP ML471L284
GE TED ted134125 125 amp 3 pole circuit breaker Used Green Label 2-I-E
General Electric overload relay manual reset only CR324E660F size 3 3 leg block
GE Busway 600 VAC 100A 3 Phase 4 Wire Circuit Breaker Box Flex a Plug Busplug
GE, #THQL2130GF1, 2Pole, 30amp, ground fault breaker, perfect, guaranteed, teste
GE General Elec. THN3364 200 Amp Non Fused Disconnect
GENERAL ELECTRIC GE CIRCUIT BOARD 44A397899-G01
Marathon Electric 3-Hp 4715 AC Motor 1725rpm 3-Ph 200-230/460VAC General Purpose
GENERAL ELECTRIC CR120C04402AA NSFP CR120C04402AA
GENERAL ELECTRIC CR1062S29J MANUAL STARTER ~NIB~
General Electric 55-501336G4 Coil - , No Box
GE TEY380 3 POLE 80 AMP 277/480V CIRCUIT BREAKER,
General Electric Heavy Duty Coil with Screw Terminals 22D63G25A NIB
TRUNBULL GE 100 AMP 3 POLE BREAKER ATB 32100 B-48
GENERAL ELECTRIC 144C7721 G1 POWER SEMICONDUCTOR *USED*
GE GENERAL ELECTRIC CR153G002AAA CONTACTOR
GE 7.5 KVA Transformer Single Phase
GENERAL ELECTRIC 9T58B72 TRANSFORMER 50/60Hz 1PH ***XLNT***
General Electric Contactor CL02D310TD 17.5A 3Pole 24VDC Rating 10HP
CR120A03102AA GENERAL ELECTRIC G.E. CR120 A03102AA
GENERAL ELECTRIC CR106D1 SER A MAGNETIC STARTER *XLNT*
GE Busway 600 VAC 100A 3 Phase 4 Wire Circuit Breaker Box Flex a Plug Busplug
GE TED TED134125 3 pole 125 AMP Circuit Breaker BLACK FACE
1 NIB GE 139C4378G4 AK-2A-3A-4A-5A?-100 SHUNT TRIP DEVICE
GENERAL ELECTRIC LAR00AJWKB NSFP LAR00AJWKB
GENERAL ELECTRIC THFV3L NSFP THFV3L
GE TFJ TFJ236Y225 225 amp TRIP 3 pole 600v AUX Breaker
GE TJJ436200 200 AMP CIRCUIT BREAKER (F6)
GE Industrial Circuit Breaker 15 Amp – 480 VAC – 250 VDC – , No Box
TED134015 3p 15a 480v
GE Spectra RMS SELA36AI0150 MAG-BREAK CIRCUIT BREAKER 150 Amp 600 VAC
GENERAL ELECTRIC 75C142442G744H?6N FLEX-A-POWER BUS PLUG, 60 Amp, STYLE 4
General Electric TFJ 236150 Circuit Breaker 150 Amp
GENERAL ELECTRIC IGNITRON MODEL G1-5630!
GENERAL ELECTRIC GE CR72AML THERMAL MAGNETIC STARTER MOTOR PROTECTOR W
GENERAL ELECTRIC 5KH25AC299 USPP 5KH25AC299
GENERAL ELECTRIC 22D155G2 NSFP 22D155G2
GE Busway 600 VAC 100A 3 Phase 4 Wire Circuit Breaker Box Flex a Plug Busplug
GE Coil from Magne Blast Circuit Breaker 6174582G2
GE THFP222X 60A Panelboard Disconnect Switch 60 Amp General Electric THFP222-XL
GE CURRENT TRANSFORMER 550T-041X071-3?02MR RATIO 3000:5A 50-400HZ USED
GE Spectra RMS SELA36AT0060 600V 3 P breaker
GENERAL ELECTRIC 5K37MN38 NSFP 5K37MN38
GE LINE CONDITIONER - MODEL 9T91L150
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