产品介绍
PLC与继电器控制的主要区别有以下几点：
（1）组成器件不同
继电器控制线路是由许多真正的硬件继电器组成的。而PLC是由许多“软继电器”组成的，这些“继电器”实际上是存储器中的触发器，可以置“0”或置“1”。
（2）触点的数量不同
硬继电器的触点数有限，一般只有4至8对；而“软继电器”可供编程的触点数有无限对，因为触发器状态可取用任意次。
（3）控制方法不同
继电器控制是通过元件之间的硬接线来实现的，因此其控制功能就固定在线路中了，因此功能专一，不灵活；而PLC控制是通过软件编程来解决的，只要程序改变，功能可跟着改变，控制很灵活。又因PLC是通过循环扫描工作的，不存在继电器控制线路中的联锁与互锁电路，控制设计大大简化了。
（4）工作方式不同
在继电器控制线路中，当电源接通时，线路中各继电器都处于受制约状态，该合的合，该断的断。而在PLC的梯形图中，各“软继电器”都处于周期性循环扫描接通中，从客观上看，每个“软继电器”受条件制约，接通时间是短暂的。也就是说继电器在控制的工作方式是并行的，而PLC的工作方式是串行的。
Parker 4CU20-130 GR.4 Coalescer Filter Element Box of 2
Parker 4-Tu-S 4tus Ferrule lot of 10
Parker 4Z-F4L-100-B FL-Series InLine Filter INI-206 Brass element
Parker 6C10-050 Filter Element Finite BDHY6C10-050
Parker 8A-V8LK-SS-GR Miniature Needle Valve 316 TD03
Parker 922622 10B RD RxP2AQ76-S5-12MGB 28-0391 6661 Hydraulic Fluid/Oil Filter
Parker 922973 74W VF Hydraulic Filter Element oil
Parker 925520 Hydraulic Filter Element
Parker 926505 10C CB Hydraulic Filter Hydraulic Element Cartridge
Parker 9550X1P Element Oring Kit Filter
Parker B1 3A DK 1 100DC2AC2 24v Valve B13ADK1100
Parker B5E2ACB53C 3/8 Pnuematic Valve SS 2POS 120V 150psi Max
Parker B5E2ACB53C 3/8 Pnuematic Valve SS 2POS 120V 150psi Max
Parker B5EJADA53C Solenoid Valve 150psi
Parker Balston, 100-25-BX, Filter Cartidge Box of 10
Parker BW14-2-A8T Cartridge Valve Base
Parker Compumotor, 057083-2-6-016-010, Stepper Motor
Parker D1VW1CVY 70 Directional Hydraulic Valve
Parker D61VW1D5NYCF D1VW30DNYCF directional valve
Parker Element Coalescer F901-100T-0771 Filter 0603 9810 F901100T0771
Parker ES75MB Pneumatic Exhaust Silencer Pneumatic Air Aluminum
Parker Filtration 922937 149W CB Hydraulic Filter Element Sump Strainer
Parker Filtration 925043 74W Hydraulic Oil Filter Element Assemply FP 10-2494
Parker Filtration 925604 40SA Hydraulic Fluid/Oil Filter P 018080-40U61V
Parker Filtration 932467 10C RR Hydraulic Filter RxP2BY29-S18-12MGB
Parker Filtration 933149 VO Hydraulic Valve Solenoid cartridge F3-W6-H2-100-1IND
Parker Filtration HF41L5VQ Hydraulic Fluid Oil Filter P169344
Parker Filtration HF42L10VQ Hydraulic Oil Fluid Filter PR2798 PR2862 PR3095
Parker Finite Filter, AU20-130, Adsorber Element 2/box
Parker Finite Filter, AU20-130, Adsorber Element 2/box
Parker FTAE2B20Q Filter RxP2CK84-S8-25MGV FTA-220QELEMENTVIT HF32H20NQ
Parker FTB1A10QE25N16X Hydraulic Filter Element FTBEIBI0Q FTBEIBIOQ
Parker G02056 10C PH Hydraulic filter RxP2CK74-S4-10MGD
Parker Hann Compumotor VIX250IM Servo Drive Controller ViX
Parker HF41L10VQ WM Hydraulic Fluid Oil Filter G04323 HF31L20VQ HF21H20NQ
Parker HF41L5VQ Hydraulic Oil Fluid Filter RxP2EG52-S9-6MGV
Parker Hydraulic Filter Division ILP-HP-A-25-25 Filter Element
Parker K142175 manifold assembly valve pneumatic
Parker LC 2 LB 3 150AB61AJ Open Solenoid Valve Skinner
Parker P1D4R040MCE0152N1NNN Pneumatic Cylinder Schrader Bellows P1D
Parker P1DYG063MC-0125NFN6N Pneumatic Air Cylinder Actuator Series P1D
Parker P1M040CDMC6M215 Pneumatic Cylinder 150psi-10bar
Parker P1M050HDGP6J25 Pneumatic Cylinder
Parker P1M050HDGP6J25 Pneumatic Cylinder
Parker P3NFA9PGSM 1 Air Filter 250 PSI (ONE INCH)
Parker P3NKB9BCP Port Block Kit regulator mount drier
Parker PEK602B 0510 Filter Element Kit
Parker PFG-60-NBR Flat Suction Pad cup vacuum
Parker PFG-80-NBR Flat Suction Pad Cup Vacuum
Parker PK152HLL01 1.5 1 1/2 Bunan piston seal kit
Parker PK202HLL01 2 Bunan Piston Seal Kit rebuild
Parker Pneumatic 06R211LC 3/8 Regulator .375 250psi
Parker Pneumatic Valve 61SADX TA14 Stainless 06PM
Parker PR602H0005 6 Viton Piston Ring Kit cylinder rebuild
Parker PS1-E1017 Interface Signal 240V 251164
Parker PS3605P Valve To Base Gasket Kit
Parker PSG-2S Mositure Indicator 1/4 Sweat x 1/4 Sweat Sight Glass Water
Parker RA2-90 Pneumatic Rotary Actuator
Parker RK2AHL0255 Rod Seal Kit (Parker Replacement Kit RK2AHL0255
Parker ROV22ZLA3C Ermeto R0V12ZLA3C EO Metric Bite Fitting Plug End Cap
Parker ROV22ZLA3C Ermeto R0V12ZLA3C EO Metric Bite Fitting Plug End Cap Blanking
Parker Schrader Bellows P1M-6MRV S/Kit Single 50MM Viton GP5 P1M P1M6MRV
Parker Schrader Bellows Vacuum Generator Convum CV-10HSN
Parker Skinner Valve 72218BN3TN00 C111P3 Solenoid 72218BN3-TN00N0C-111P3
Parker valve H2567BKCB9166B V-443P 5599-2 PS4138166P H2
Parker VKA22A3C Blanking Plug Ermeto Steel 234108CC
Parker VKA22A3C Blanking Plug Ermeto Steel 234108CC
Parker, 01.50 CP2HRVS14M, 0.500 Hydraulic Cylinder Series 2H 3000psi
Parker, 05R213AD, 3/8 NPT Pneumatic Regulator
Parker, 10 TU-S, Ferrule 50pcs/ box
Parker, 10678-16-16, Hydrualic Fitting Parkrimp Permanent Female JIC 37° Swivel
Parker, 10678-20-20, Hydraulic # 20 Crimp Female JIC 37° x 1 1/4 i.d. Hose Fit
Parker, 11943-24-24, Flange 90 Degree Hydraulic Crimp Hose Fitting
Parker, 12F23C2148ACF4C05, Gold Ring Solenoid Valve 3/4NPT Oil Water Air
Parker, 13778-16-16, Hydraulic Crimp Fitting Connector
Parker, 13926-6-6, 1392666, PARKER CRIMP FITTING FEMALE box of 10 JIC 37 SWIVEL
Parker, 13943-24-24, Hydraulic Fitting Hose Crimp
Parker, 16A78-16-16, Hydraulic Fitting Parkrimp Permanent SAE Code 62 Flange Hea
Parker, 16F78-16-16, SAE 45 Degree 1 Hydraluic FItting Crimp Hose Adapter 78 Se
Parker, 16L1RBE, Pneumatic Air Lubricator Filter 1/4 With Fill Plug
Parker, 16N78-12-12, Hydraulic Fitting Connector
（1）组成器件不同
继电器控制线路是由许多真正的硬件继电器组成的。而PLC是由许多“软继电器”组成的，这些“继电器”实际上是存储器中的触发器，可以置“0”或置“1”。
（2）触点的数量不同
硬继电器的触点数有限，一般只有4至8对；而“软继电器”可供编程的触点数有无限对，因为触发器状态可取用任意次。
（3）控制方法不同
继电器控制是通过元件之间的硬接线来实现的，因此其控制功能就固定在线路中了，因此功能专一，不灵活；而PLC控制是通过软件编程来解决的，只要程序改变，功能可跟着改变，控制很灵活。又因PLC是通过循环扫描工作的，不存在继电器控制线路中的联锁与互锁电路，控制设计大大简化了。
（4）工作方式不同
在继电器控制线路中，当电源接通时，线路中各继电器都处于受制约状态，该合的合，该断的断。而在PLC的梯形图中，各“软继电器”都处于周期性循环扫描接通中，从客观上看，每个“软继电器”受条件制约，接通时间是短暂的。也就是说继电器在控制的工作方式是并行的，而PLC的工作方式是串行的。
Parker 4CU20-130 GR.4 Coalescer Filter Element Box of 2
Parker 4-Tu-S 4tus Ferrule lot of 10
Parker 4Z-F4L-100-B FL-Series InLine Filter INI-206 Brass element
Parker 6C10-050 Filter Element Finite BDHY6C10-050
Parker 8A-V8LK-SS-GR Miniature Needle Valve 316 TD03
Parker 922622 10B RD RxP2AQ76-S5-12MGB 28-0391 6661 Hydraulic Fluid/Oil Filter
Parker 922973 74W VF Hydraulic Filter Element oil
Parker 925520 Hydraulic Filter Element
Parker 926505 10C CB Hydraulic Filter Hydraulic Element Cartridge
Parker 9550X1P Element Oring Kit Filter
Parker B1 3A DK 1 100DC2AC2 24v Valve B13ADK1100
Parker B5E2ACB53C 3/8 Pnuematic Valve SS 2POS 120V 150psi Max
Parker B5E2ACB53C 3/8 Pnuematic Valve SS 2POS 120V 150psi Max
Parker B5EJADA53C Solenoid Valve 150psi
Parker Balston, 100-25-BX, Filter Cartidge Box of 10
Parker BW14-2-A8T Cartridge Valve Base
Parker Compumotor, 057083-2-6-016-010, Stepper Motor
Parker D1VW1CVY 70 Directional Hydraulic Valve
Parker D61VW1D5NYCF D1VW30DNYCF directional valve
Parker Element Coalescer F901-100T-0771 Filter 0603 9810 F901100T0771
Parker ES75MB Pneumatic Exhaust Silencer Pneumatic Air Aluminum
Parker Filtration 922937 149W CB Hydraulic Filter Element Sump Strainer
Parker Filtration 925043 74W Hydraulic Oil Filter Element Assemply FP 10-2494
Parker Filtration 925604 40SA Hydraulic Fluid/Oil Filter P 018080-40U61V
Parker Filtration 932467 10C RR Hydraulic Filter RxP2BY29-S18-12MGB
Parker Filtration 933149 VO Hydraulic Valve Solenoid cartridge F3-W6-H2-100-1IND
Parker Filtration HF41L5VQ Hydraulic Fluid Oil Filter P169344
Parker Filtration HF42L10VQ Hydraulic Oil Fluid Filter PR2798 PR2862 PR3095
Parker Finite Filter, AU20-130, Adsorber Element 2/box
Parker Finite Filter, AU20-130, Adsorber Element 2/box
Parker FTAE2B20Q Filter RxP2CK84-S8-25MGV FTA-220QELEMENTVIT HF32H20NQ
Parker FTB1A10QE25N16X Hydraulic Filter Element FTBEIBI0Q FTBEIBIOQ
Parker G02056 10C PH Hydraulic filter RxP2CK74-S4-10MGD
Parker Hann Compumotor VIX250IM Servo Drive Controller ViX
Parker HF41L10VQ WM Hydraulic Fluid Oil Filter G04323 HF31L20VQ HF21H20NQ
Parker HF41L5VQ Hydraulic Oil Fluid Filter RxP2EG52-S9-6MGV
Parker Hydraulic Filter Division ILP-HP-A-25-25 Filter Element
Parker K142175 manifold assembly valve pneumatic
Parker LC 2 LB 3 150AB61AJ Open Solenoid Valve Skinner
Parker P1D4R040MCE0152N1NNN Pneumatic Cylinder Schrader Bellows P1D
Parker P1DYG063MC-0125NFN6N Pneumatic Air Cylinder Actuator Series P1D
Parker P1M040CDMC6M215 Pneumatic Cylinder 150psi-10bar
Parker P1M050HDGP6J25 Pneumatic Cylinder
Parker P1M050HDGP6J25 Pneumatic Cylinder
Parker P3NFA9PGSM 1 Air Filter 250 PSI (ONE INCH)
Parker P3NKB9BCP Port Block Kit regulator mount drier
Parker PEK602B 0510 Filter Element Kit
Parker PFG-60-NBR Flat Suction Pad cup vacuum
Parker PFG-80-NBR Flat Suction Pad Cup Vacuum
Parker PK152HLL01 1.5 1 1/2 Bunan piston seal kit
Parker PK202HLL01 2 Bunan Piston Seal Kit rebuild
Parker Pneumatic 06R211LC 3/8 Regulator .375 250psi
Parker Pneumatic Valve 61SADX TA14 Stainless 06PM
Parker PR602H0005 6 Viton Piston Ring Kit cylinder rebuild
Parker PS1-E1017 Interface Signal 240V 251164
Parker PS3605P Valve To Base Gasket Kit
Parker PSG-2S Mositure Indicator 1/4 Sweat x 1/4 Sweat Sight Glass Water
Parker RA2-90 Pneumatic Rotary Actuator
Parker RK2AHL0255 Rod Seal Kit (Parker Replacement Kit RK2AHL0255
Parker ROV22ZLA3C Ermeto R0V12ZLA3C EO Metric Bite Fitting Plug End Cap
Parker ROV22ZLA3C Ermeto R0V12ZLA3C EO Metric Bite Fitting Plug End Cap Blanking
Parker Schrader Bellows P1M-6MRV S/Kit Single 50MM Viton GP5 P1M P1M6MRV
Parker Schrader Bellows Vacuum Generator Convum CV-10HSN
Parker Skinner Valve 72218BN3TN00 C111P3 Solenoid 72218BN3-TN00N0C-111P3
Parker valve H2567BKCB9166B V-443P 5599-2 PS4138166P H2
Parker VKA22A3C Blanking Plug Ermeto Steel 234108CC
Parker VKA22A3C Blanking Plug Ermeto Steel 234108CC
Parker, 01.50 CP2HRVS14M, 0.500 Hydraulic Cylinder Series 2H 3000psi
Parker, 05R213AD, 3/8 NPT Pneumatic Regulator
Parker, 10 TU-S, Ferrule 50pcs/ box
Parker, 10678-16-16, Hydrualic Fitting Parkrimp Permanent Female JIC 37° Swivel
Parker, 10678-20-20, Hydraulic # 20 Crimp Female JIC 37° x 1 1/4 i.d. Hose Fit
Parker, 11943-24-24, Flange 90 Degree Hydraulic Crimp Hose Fitting
Parker, 12F23C2148ACF4C05, Gold Ring Solenoid Valve 3/4NPT Oil Water Air
Parker, 13778-16-16, Hydraulic Crimp Fitting Connector
Parker, 13926-6-6, 1392666, PARKER CRIMP FITTING FEMALE box of 10 JIC 37 SWIVEL
Parker, 13943-24-24, Hydraulic Fitting Hose Crimp
Parker, 16A78-16-16, Hydraulic Fitting Parkrimp Permanent SAE Code 62 Flange Hea
Parker, 16F78-16-16, SAE 45 Degree 1 Hydraluic FItting Crimp Hose Adapter 78 Se
Parker, 16L1RBE, Pneumatic Air Lubricator Filter 1/4 With Fill Plug
Parker, 16N78-12-12, Hydraulic Fitting Connector
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