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2）從工作方式上看，在繼電器控制電路中，當電源接通時，電路中所有繼電器都處於受制約狀態，即該吸合的繼電器都同時吸合，不該吸合的繼電器受某種條件限制而不能吸合，這種工作方式稱為並行工作方式。而PLC的用戶程序是按順序循環執行，所以各軟繼電器都處於周期性循環掃描接通中，受同一條件制約的各個繼電器的動作次序決定於程序掃描順序，這種工作方式稱為串行工作方式。
3）從控制速度上看，繼電器控制係統依靠機械觸點的動作以實現控制，工作頻率低，機械觸點還會出現抖動問題。而PLC通過程序指令控制半導體電路來實現控制的，速度快， 程序指令執行時間在微秒級，且不會出現觸點抖動問題。
4）從定時和計數控制上看，電器控制係統採用時間繼電器的延時動作進行時間控制，時間繼電器的延時時間易受環境溫度和溫度變化的影響，定時精度不高。而PLC採用半導體集成電路作定時器，時鐘脈衝由晶體振蕩器產生，精度高，定時範圍寬，用戶可根據需要在程序中設定定時值，修改方便，不受環境的影響，且PLC具有計數功能，而電器控制係統一般不具備計數功能。
Honeywell DEFINITE PURPOSE CONTACTOR, DP3060B1008
Bitronics Single Demand Meter 2, ASADC2, Shipsameday, 1215C
Sumito Thermocouple 4.0 Dia 134L, JA750504A4, S-5190-75050, 1627B3
Telemecanique ZB2BW075, ZB2-BE101, ZB2-BE102, Z-BW07, Shipsameday 1627B4
Cooper Bussmann FHL181-5, 5920-269-3743, DSA900-69-M-EE64, Shipsameday, ZD8
Balluff BES516-326-B0-C, BES-516-326-BO-C,10-30VDC, Shipsameday 1616P
BIMBA 122.5-DXDEH, 1225DXDEH, Shipsameday 1229M
Allen Bradley 634490, Rev 6, SHIPSAMEDAY1225Y
Koganei RAD25x30-90-ER-HA, Air Cylinder RAD25x3090ERHA 1631Z
Allen Bradley Processor SLc 500, 1747-L20B, SHIPSAMEDAY1208B
Square D 9001KXSYC5 Selector Switch Operator 30mm Type KX, SHIPSAMEDAY 1545R
Renata CR2032.IB, CR2032IB, ShipsamDay D25
Timken 376A Tapered Roller Bearing, M4
Phoenix Contact 2938947, Step-sp-100-240ac/24dc/1.5, Shipsameday132AM
Analog Devices AMP03GSZ, AMP03GSZ-ND, Shipsameday, D34
Motorola HC573A, CPCR9922, Shipsameday1533B3
Maxim MAX3387EEUG, Lot Of 49, Shipsameday, D47
Swagelok Brass Cap 6mm, B-6M0-C, B6M0C, Shipsameday Rack L L74
Joucomatic 52000078, 39-553-0098, Shipsameday W/2-3 Daysshipping134N
Fuji Electric Temperature Controller PYX4MCY1-000YC, Shipsameday 1539G
Fuji Electric Temperature Controller PYX4MCY1-001RC, Shipsameday 1539G1
Fuji Electric Temperature Controller PYX4MCY1-001RC, Shipsameday1539G2
Omron Temperature Controller E5CN-R2T, E5CNR2T, Shipsameday1539G4
VEEDER-ROOT, Model T-120506-100, T120506100, 115Vac, 60hz, 6w, 101A16
HAMMOND R100-082-000 ENCLOSURE WALL MOUNT ALUMINIUM 1644J
Hitachi K12N-EPW, K12NEPW, NNB, ShipSameDay W/2-3 Days Shipping1619A8
Trerice B8560408, B85604 50/500F & 10/260C
Telemecanique GP2-P32 GP2P32 24-32A ShipSameDay W2-3Dayscshipping1619A10
BURKERT TIMER W43LS 1078/1 110/230VAC 456178D, 1078/1, W43LS, SHIPSAMEDAY 1625A
Wika Gauge 232.34, 4.5 160PSI 1/2 NPT SST LM 9834842 Shipsameday W/2-3day135B
Telemecanique 3 Pole Isol Load Breaker Switch V3055171
MERLIN GERIN MG24502, Multi C60, D3A, Shipsameday 1643A37
Datamyte 91708-20 Federal Max 20ft, 91708-020, 91708, 46-565-5370 1643A68
Texas Ins IC 1.8V 100ma, TPS79118DBVR, 296-11865-1-D, E55
NW25, Clamp & Centering & Elbow NW25, 701001, 710000, BOX C 1600AK
Panasonic CAP ALUM 22UF 16V 20% SMD, ECE-V1CA220SR, PCE3063TR-N R16
ALLEN BRADLEY PILOT LIGHT, 800MR-PDT16G, 800MRPDT16G, SHIPSAMEDAY1608Q
Linear IC REG SWITCHD CAP 3.3V 8MSOP, LTC1682IMS8-3.3, SHIPSAMEDAYV2
GE Fanuc Series One Programmable Controller, IC610MDL124B
Marposs 3419822061 a405 Measuring Cell 2.5 With Cable, 46-701-0215 1643A67
ARO Cylinder MQ-1853-014, MQ1853014, SHIPSAMEDAY1471A5
Texas Instruments IC A/D 15MSPS 12BIT THS1215IDW, 296-10010-5-ND
Texas Instruments IC LDO REG102NA-2.8/250, REG102NA2.8250CT-ND
REXROTH P-187311, MCC MS2-PP, 1.50 X .75, ShipSameDay Rack K K40
Spray Systems QUA-SS (25/40) & QJJA-SS, 3/8 npt, ShipSameDay 1648F
Bimba 0411-DP & PHD Parker Cylinder, The Cilinder 18D-6, SHIPSAMEDAY
Marposs 1024900527 Lever Support, shipsameday 1645A7
Sick Optex ZT-1200P, ZT1200P, Shipsameday1618J
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