ABB 6214BZ10110C

ABB 6214BZ10110C
 PLC控制系统与电器控制系统相比，有许多相似之处，也有许多不同。不同之处主要在以下几个方面：

 1）从控制方法上看，电器控制系统控制逻辑采用硬件接线，利用继电器机械触点的串联或并联等组合成控制逻辑，其连线多且复杂、体积大、功耗大，系统构成后，想再改变或增加功能较为困难。另外，继电器的触点数量有限，所以电器控制系统的灵活性和可扩展性受到很大限制。而PLC采用了计算机技术，其控制逻辑是以程序的方式存放在存储器中，要改变控制逻辑只需改变程序，因而很容易改变或增加系统功能。系统连线少、体积小、功耗小，而且PLC所谓“软继电器”实质上是存储器单元的状态，所以“软继电器”的触点数量是无限的，PLC系统的灵活性和可扩展性好。

   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的用户程序是按一定顺序循环执行，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。

  5）从可靠性和可维护性上看，由于电器控制系统使用了大量的机械触点，其存在机械磨损、电弧烧伤等，寿命短，系统的连线多，所以可靠性和可维护性较差。而PLC大量的开关动作由无触点的半导体电路来完成，其寿命长、可靠性高，PLC还具有自诊断功能，能查出自身的故障，随时显示给操作人员，并能动态地监视控制程序的执行情况，为现场调试和维护提供了方便。
NEW ALKAR 50833 EG 110 TOOTH CHAIN SINGLE ROW 2 IN SPRO

NEW MARTIN 80E84 27-1/4IN OD CHAIN SINGLE ROW 3-13/16IN

NEW MARTIN E100C23 3-1/2 IN BORE TRIPLE ROW CHAIN SPROC

NEW NATIONAL PARTS SUPPLY 411440312 SINGLE ROW 1 IN SPR

NEW MARTIN 100BTB48 3020 TAPER BUSHED SINGLE ROW CHAIN

NEW MARTIN 200J14 14 TOOTH SINGLE ROW 4-15/16IN CHAIN S

NEW NATIONAL PARTS SUPPLY 411440311 SINGLE ROW 1 IN SPR

NEW MARTIN D140B16 16 TOOTH STEEL CHAIN DOUBLE ROW 3-3/

NEW MARTIN D140B16 16 TOOTH STEEL CHAIN DOUBLE ROW 1-1/

NEW PSC 132X2260 36TOOTH STOCK BORE CHAIN DOUBLE ROW 1-

NEW PSC 132X2260 36TOOTH STOCK BORE CHAIN DOUBLE ROW 1-

NEW BROWNING TG60A72K 3-1/4IN BORE SINGLE ROW CHAIN SPR

NEW MARTIN E100B19 19TOOTH IDLER CHAIN TRIPLE ROW 40MM

NEW TSUBAKI 80B18SS NO 80 CHAIN SINGLE ROW 1-15/16 IN S

NEW KORBER CONVEYOR CHAIN WHEEL 1-3/4IN BORE QUAD ROW S

NEW GARDNER OM6143 ROLLER CHAIN SINGLE ROW 1-1/2 IN DRI

NEW ALKAR 70618 304SS STAINLESS 15 IN CHAIN SINGLE ROW

NEW MARTIN 60B35SS 35 TOOTH STAINLESS CHAIN SINGLE ROW

NEW MARTIN 60B35SS CHAIN SINGLE ROW 2 IN SPROCKET STAIN

NEW MARTIN D100B26 26 TOOTH ROUGH BORE CHAIN DOUBLE ROW

NEW INDAG 60005273 20-7/8IN OD PLASTIC 5-1/8IN ID BELT

NEW PSC 1364712 9 TOOTH STEEL CHAIN SINGLE ROW 1IN BORE

NEW MARTIN E100B19 19TOOTH STEEL CHAIN TRIPLE ROW 1-5/8

NEW INDAG 60001802 SINGLE ROW CHAIN SPROCKET 19TOOTH ST

NEW LINN GEAR 120-40 BUSHED TAPER CHAIN SINGLE ROW SPRO

NEW BROWNING HN140B11 NEEDLE BEARING 1-1/2IN IDLER CHAI

NEW MARTIN E80B30 1-1/4IN ROUGH BORE CHAIN TRIPLE ROW S

NEW LINN GEAR 120TLB35 CHAIN SINGLE ROW 4-1/2IN TAPER-L

NEW MARTIN E100B35 35 TOOTH CHAIN TRIPLE ROW 3-7/16IN S

NEW GATES 8M 224S 12 POLYCHAIN QD BUSHED 22-1/2IN OD BE

NEW MARTIN 14-4261 STEEL QD BUSHING CHAIN DOUBLE ROW 1-

NEW DODGE 160CTL35 35TOOTH TAPER BUSHING CHAIN SINGLE R

NEW ARPAC 140337 BELT SINGLE ROW 2 IN SPROCKET B363576

NEW MARTIN 60B28SS STAINLESS STEEL CHAIN SINGLE ROW 2-1

NEW MATTHEWS E3101-48-A 14TOOTH CHAIN SINGLE ROW 2-3/16

NEW TSUBAKI 35B45SS 45 TEEH STAINLESS CHAIN SINGLE ROW

NEW 41H624 STAINLESS 16 TEETH CHAIN SINGLE ROW 1-1/4 IN

NEW MARTIN 1.630C16SS STAINLESS CHAIN SINGLE ROW 1-1/2I

NEW MARTIN B5453 BEVEL POWER TRANSMISSION GEAR 1-1/4 IN

NEW MARTIN 80BS45 2-7/16 ROLLER CHAIN SINGLE ROW 2 IN S

NEW MARTIN 160F18H QD BORE HARDENED 18 TOOTH CHAIN SING

NEW GOODYEAR W-180S-E EAGLE PD STI QD BORE SINGLE ROW B

NEW UNIROYAL P72-8M-50-SK TIMING BELT SINGLE ROW SPROCK

NEW 60 2CH 37 80 72 TOOTH 1-7/16IN ROUGH BORE CHAIN DOU

NEW P72-8M-85-SF 72TOOTH SINGLE ROW TIMING BELT SPROCKE

NEW TB WOODS W90-8M-35-SF 2-15/16IN OD POWER CHAIN 1/2

NEW GOODYEAR W-60S-MPB EAGLE PD DOUBLE HELICAL TIMING 1

NEW MARTIN 2052JA10SS 1210 BUSHING ASSEMBLY STAINLESS C

NEW ROVEMA 02180848 1-1/4IN BORE DRIVE SPROCKET D273331

NEW SOLIDUR PACIFIC PNYT8F20B40 TIMING BELT SPROCKET 3

NEW MARTIN 2060B35SS STAINLESS CHAIN SINGLE ROW 1 IN SP

MARTIN 140B16 STEEL ROLLER 1 IN SINGLE ROW CHAIN SPROCK

MARTIN D50B60 STEEL ROLLER 1-5/16 IN DOUBLE ROW CHAIN S

NEW TB WOODS W4414M42 7/8-3-1/2IN BORE 44TEETH QD CHAIN

MARTIN E80B30 ROUGH BORE 1-1/4 IN TRIPLE ROW CHAIN SPRO

NEW MARTIN DS12B18SS STAINLESS CHAIN DOUBLE ROW 30MM BO

MARTIN D80B30 STEEL ROLLER 3 IN DOUBLE ROW CHAIN SPROCK

NEW PLANET PRODUCTS 2509-730 ROLLER CHAIN SPROCKET 1 IN

NEW MARTIN 60B24SS STAINLESS 3/4IN ROUGH BORE SINGLE RO

NEW MARTIN DS12B18SS STAINLESS CHAIN DOUBLE ROW 30MM BO

NEW MARTIN 60B24SS STAINLESS 24 TOOTH CHAIN SINGLE ROW

NEW MECTROL MP2553 52 TOOTH TIMING BELT DOUBLE ROW 1IN

NEW MARTIN 60B24SS STAINLESS CHAIN SINGLE ROW 1-1/4IN B

NEW MULTIVAC 100342601 DOUBLE ROW 1 IN SPROCKET B222471

NEW BOSTON GEAR KDB-21C D40B21 5/8IN DOUBLE ROW CHAIN S

NEW MARTIN 60B25SS 60BB25SS STAINLESS IDLER SINGLE ROW

NEW 30023206 INDEXING 36 TEETH DOUBLE ROW 1 IN SPROCKET

NEW MARTIN 40B40SS STAINLESS SINGLE ROW CHAIN SPROCKET

NEW GARDNER CH4269 OM4269 ROLLER CHAIN SINGLE ROW 1 IN

BROWNING H120R19 STEEL 120 19 TEETH BORE ROLLER CHAIN S

NEW GOODYEAR W-64S-MPB EAGLE PD DOUBLE HELICAL TIMING 1

NEW MARTIN DS50A20SS STAINLESS 20 TOOTH DOUBLE ROW 1-7/

NEW 180A10 80MM ID SINGLE ROW CHAIN SPROCKET D378224

NEW HYSTER 0263401 FORKLIFT CRANKSHAFT SINGLE ROW CHAIN

NEW FMC LINK BELT 117111A INNER DRIVE CHAIN SINGLE ROW

NEW NPS 403640026 REV G 31TOOTH CHAIN 14-3/16IN SPROCKE

NEW NPS 403640026 REV F 31TOOTH 14-3/16IN OD CHAIN SPRO

NEW CAMBRIDGE CWC25T D2383P-01 1-1/2IN BORE SINGLE ROW

NEW MARTIN D80CTB30-3020 BUSHED TAPER CHAIN DOUBLE ROW

NEW MARTIN D120B13 CHAIN DOUBLE ROW 2-7/8 IN SPROCKET D

NEW TSUBAKI H80BTL24 TAPER-LOCK CHAIN SINGLE ROW 1-11/1

NEW LINK-BELT P44032 33 50 TOOTH BELT DOUBLE ROW 1-11/1

NEW ALSIP MANUFACTURING 3CEN1681 16 TOOTH CHAIN 1-1/2 I

NEW MARTIN 40B40SS STAINLESS 40TOOTH CHAIN SINGLE ROW 1

NEW 160B21 21 TOOTH 14-7/16IN OD CHAIN SINGLE ROW 2 IN

NEW 59607 8-1/2IN OD STEEL CHAIN TRIPLE ROW 16T 3-1/2IN

NEW 59607 16T TOOTH STEEL CHAIN TRIPLE ROW 3-7/16IN SPR

NEW DETROIT HOIST & CRANE 050-0185 ROLLER CHAIN SPROCKE

NEW MARTIN 60B20SS 20T NO.60 CHAIN SPROCKET 1 IN BORE

NEW GATES 14MX-36S-68-302?0 BUSHED TAPER POLY CHAIN GT2

NEW MARTIN D40CTL84 1IN BORE DOUBLE ROW CHAIN SPROCKET

NEW TB WOODS W80-8M-35-SF W808M35 POWER CHAIN 1/2 - 2-1

NEW TSUBAKI 80 24 24TOOTH PLATE CHAIN SINGLE ROW 2 IN S

NEW RAMSEY 408-57 1-7/16 IN DOUBLE ROW SPROCKET D404904

NEW BOSCH 31 TOOTH 54.656724 BEARING GEAR 3/4 IN CHAIN

NEW REXNORD 815-20T 20 TOOTH TABLE TOP CHAIN DOUBLE ROW

NEW MARTIN 100B54 SINGLE ROW CHAIN SPROCKET 3-7/16IN BO

NEW TSUBAKI H80BTL24 24TOOTH TAPER-LOCK HUB CHAIN 1-11/

MARTIN S432 GEAR SPUR15/16 IN SINGLE ROW SPROCKET B3698

NEW 8 TOOTH STEEL 11-1/2IN OD CHAIN SINGLE ROW 2-5/16 I

NEW MARTIN D80B36 36TEETH CHAIN DOUBLE ROW 2IN SPROCKET

NEW TB WOODS W80-8M-35-SF W808M35 POWER BELT 1/2 - 2-15

NEW INDAG 61/50018777/CFM?-00-003 19 TOOTH CHAIN 2-9/16I

NEW TSUBAKI 50B15SS F1-3/16 CHAIN SINGLE ROW 1-3/16IN B

NEW RAMSEY 357456-1 64T SS STAINLESS 1 IN BORE SINGLE R

NEW TB WOODS P728M50 P72-8M-50-SK SYNCHRONOUS BELT 2-3/

NEW RAMSEY 354142-1 64T STAINLESS 1 IN SINGLE ROW CHAIN

NEW RAMSEY 355566-1 64T SS STAINLESS 1 IN SINGLE ROW CH

NEW BROWNING D80R36 CHAIN DOUBLE ROW 3 IN SPROCKET R1 B

NEW GOODYEAR W-40-MPB SIT TENSIONER ASSEMBLY 4IN OD SIN

NEW GATES 14M-48S-90 F POLY CHAIN GT TIMING CHAIN SINGL

NEW TB WOODS W48-14M-42-E QT POWER TIMING CHAIN SPROCKE

NEW TB WOODS W5614M42E W56 14M 42E SINGLE ROW BELT SPRO

NEW DETROIT HOIST & CRANE MF-343 1/2IN PITCH 1-1/8 IN B

NEW MARTIN D120B12 12-TOOTH CHAIN DOUBLE ROW 2-7/8 IN S

NEW ALSIP MANUFACTURING 3CEN1776 STAINLESS CHAIN 1-1/2

NEW MEADWESTVACO 02-017194-0019-?3 19 TOOTH KEYED CHAIN

NEW TB WOODS P48-8M-85-SD CKA SYNCH 48TOOTH BELT SINGLE

NEW MARTIN P4414M115-E QD BORE PULLEY TIMING BELT SPROC

NEW MARTIN 40B35SS STAINLESS CHAIN SINGLE ROW 3/4IN BOR