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2）从工作方式上看，在继电器控制电路中，当电源接通时，电路中所有继电器都处于受制约状态，即该吸合的继电器都同时吸合，不该吸合的继电器受某种条件限制而不能吸合，这种工作方式称为并行工作方式。而PLC的用户程序是按顺序循环执行，所以各软继电器都处于周期性循环扫描接通中，受同一条件制约的各个继电器的动作次序决定于程序扫描顺序，这种工作方式称为串行工作方式。

  3）从控制速度上看，继电器控制系统依靠机械触点的动作以实现控制，工作频率低，机械触点还会出现抖动问题。而PLC通过程序指令控制半导体电路来实现控制的，速度快， 程序指令执行时间在微秒级，且不会出现触点抖动问题。

 4）从定时和计数控制上看，电器控制系统采用时间继电器的延时动作进行时间控制，时间继电器的延时时间易受环境温度和温度变化的影响，定时精度不高。而PLC采用半导体集成电路作定时器，时钟脉冲由晶体振荡器产生，精度高，定时范围宽，用户可根据需要在程序中设定定时值，修改方便，不受环境的影响，且PLC具有计数功能，而电器控制系统一般不具备计数功能。

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