详情介绍

SH68-68-EPSH68-68-EP，SH68-68-EP

PLC与继电器控制逻辑的性能和价格8大方面的比较

① 控制逻辑：继电器控制逻辑采用硬接线逻辑，利用继电器机械触点的串联或并联及延时继电器的滞后动作等组合成控制逻辑，其连线多而复杂，体积大，功耗大，一旦系统构成后，想再改变或增加功能都很困难。另外继电器触点数目有限，每只一般只有4～8对触点，因此灵活性和扩展性都很差。而PLC采用存储逻辑，其控制逻辑以程序方式存储在内存中，要改变控制逻辑，只需改变程序，故称为“软接线”，其连线少，体积小，加之PLC中每只软继电器的触点数理论上无限制，因此灵活性和扩展性都很好。PLC由中大规模集成电路组成，功耗小。

② 工作方式：当电流接通时，继电控制线路中各继电器都处于受约状态，即该吸合的都应吸合，不该吸合的都因受某种条件限制不能吸合。而PLC的控制逻辑中，各继电器都处于周期性循环扫描接通之中，从宏观上看，每个继电器受制约接通的时间是短暂的。

③ 控制速度：继电控制逻辑依靠触点的机械动作实现控制，工作频率低。触点的开闭动作一般在几十毫秒数量级。另外机械触点还会出现抖动问题。而PLC是由程序指令控制半导体电路来实现控制的，速度极快，一般一条用户指令的执行时间在微秒数量级。PLC内部还有严格的同步，不会出现抖动问题。

600 VAC 10 Amp
ALLEN BRADLEY RELAY LOT OF 6 700-HA33A1 SER A
Allen Bradley Relay Cat #700-HA32Z24 10A 24 VDC 2 PDT (NIB)
Allen Bradley Relay Cat #700-HA32Z12 10A 12 VDC 2 PDT (NIB)
ALLEN BRADLEY RELAY BASE LOT OF 5 700-HN121 SER A
ALLEN BRADLEY RELAY BASE LOT OF 3 700-HN153 SER B
ALLEN BRADLEY Relay Base 15 Amp 700 HN153 w/ 120V Relay 700 HB33A1
ALLEN BRADLEY RELAY AND SOCKET ASSEMBLY MODEL 700HLS1Z24 700TBR24(12 AVAILABLE)
ALLEN BRADLEY RELAY 700-PB40 SER. A W/ 700-P400A1 SER. A      700PB40 700P400A1
ALLEN BRADLEY RELAY 700-NA40 SER. B / 700-N200A1 SER. C *    *
Allen Bradley Relay 700-HF32A12
Allen Bradley Relay 700HC54A14 1/10HP 1A RES 120VAC 50/60Hz
Allen Bradley Relay 700HB33A1 3PDT
Allen Bradley Relay 700-HB33A1 120VAC Square D Base NR82
Allen Bradley Relay 700-HB32Z24-1-4 W/Base 24 VDC
Allen Bradley Relay 700-HB32Z24 W/Base 24VDC 10Amp
Allen Bradley Relay 700-HA32A1-3
Allen Bradley Relay 700DC-F400 24vdc coil
Allen Bradley Relay 12 Pole P1200A1 SERIES B
ALLEN BRADLEY RELAY 100-C23*400 SER.C W/ 193-ED1CB SER.B 110/50, 120/60 *    *
Allen Bradley Relay 10 amp 700-HF33A1
ALLEN BRADLEY RED TWIST RELEASE PUSH BUTTON 800T-FXT A1 SER T
ALLEN BRADLEY RED PUSHBUTTON WITH RED CONTACTS LOT OF 5 800E-A2L
ALLEN BRADLEY RED PUSHBUTTON SER T WITH CONTACTOR LOT OF 5 800T-A...
ALLEN BRADLEY RED PUSHBUTTON SER T LOT OF 5 800T-PT16
ALLEN BRADLEY RED PUSHBUTTON LOT OF 5 800T-PB16 SER T
ALLEN BRADLEY RED PUSH/PULL TWIST RELEASE SWITCH 800H-FRXT6A5 S.F (S23-T-8C)
ALLEN BRADLEY RED PUSH BUTTON WITH RED/GREEN CONTACTS LOT OF 5
ALLEN BRADLEY RED PUSH BUTTON LOT OF 5 800T-FXTLQ24RA1 SER T 99052
ALLEN BRADLEY RED PUSH BUTTON LOT OF 5 800T-B... SER T 99128
ALLEN BRADLEY RED PUSH BUTTON 800T-PA16 SER T
ALLEN BRADLEY RED PUSH BUTTON 800T-FXT A1
ALLEN BRADLEY RED PUSH BUTTOM 800T-QT24R SER T
ALLEN BRADLEY RED PILOT LIGHT 800T-QTH10R SER T
Allen Bradley Red Pilot Light 120VAC 800H-PR16R Series C USG
ALLEN BRADLEY RED LED LAMP 800E-N157R
ALLEN BRADLEY RED ILLUMINATED PUSHBUTTON SER T W/ CONTACTS 800T-QT06
ALLEN BRADLEY Red Flush Head Push Button 800T A6A ser - T / *******SEE NOTE***
ALLEN BRADLEY Red Flush Head Push Button 800T A6A
ALLEN BRADLEY RED CONTROL TOWER LENS 855T-B10DN4 SER. B      IN BOX
ALLEN BRADLEY RD-3411   RD3411
ALLEN BRADLEY RC-3S06   RC3S06
ALLEN BRADLEY RC3324   RC3324
Allen Bradley Quick Disconnect 4 Pin Mini Straight Male 871A-TS4-NM3 Ser A
Allen Bradley Quad AC Output Board, 1720-B1414, Ser. E,     , WARRANTY
Allen Bradley Quad AC Output Board, 1720-B1414, Ser. D,     , WARRANTY
Allen Bradley QD Cordset 889D-F8AC-10
Allen Bradley PushButton w/ 800F-N3W & X10 Contacts
Allen Bradley PushButton w/ 800F-N3W & X10 Contact red
Allen Bradley Pushbutton Switch 800MB-CPA16S      #38206
ALLEN BRADLEY PUSHBUTTON BLACK FLUSH MOMENTARY
ALLEN BRADLEY PUSHBUTTON 800T-PB16, SERIES T, 120V, 50/60 HZ, GREEN
Allen Bradley Pushbutton 800T-PB16 Ser T      #38297
Allen Bradley Pushbutton 800T-PB16 Ser N      #38158
Allen Bradley Pushbutton 800MR-QB24      #21029
Allen Bradley Pushbutton 800MR-D9      #18434
Allen Bradley Pushbutton 800MR-B2B      #29757
Allen Bradley Pushbutton - Red 800T-FXP16A1      #38868
Allen Bradley Pushbutton - Green 800T-PA16      #38177
Allen Bradley Push To Test Pilot Light 800T-PT16 White
Allen Bradley Push To Test Pilot Light 800T-PT16 Green
Allen Bradley Push To Test Pilot Light 800T-PT16 Green
Allen Bradley Push to Test Pilot Light 800MR-PT16S
ALLEN BRADLEY PUSH BUTTON, 800T-PB16, SER. T, GREEN, LAMP 755/1866
ALLEN BRADLEY PUSH BUTTON, 800TC-P16, SER. T, RED, LAMP 755
Allen Bradley Push Button 800T-B SER T with AB 800T-XD2 Contact Block
ALLEN BRADLEY PUSH BUTTON 800T-A SER.T      800TA
ALLEN BRADLEY PUSH BUTTON 800MR-PT16 SER. D 800M-XA SER.B NNB
ALLEN BRADLEY PROXIMITY SWITCH 872C-DH10NP30-E2 SER. C *    *
ALLEN BRADLEY PROXIMITY SWITCH 871TM-B2C12-R3 SER. A *    *
ALLEN BRADLEY PROXIMITY SWITCH 871C-N2A12 SER. A      871CN2A12
Allen Bradley Proximity Sensor, 871TM-DH5CE18-A2
Allen Bradley Proximity Sensor 871T-L5A18      #62656
Allen Bradley Protected Motor Starter 140-MN-0400 Series A
Allen Bradley Protected Motor Starter 140-MN-0160 Series A
Allen Bradley Protected Motor Starter 140-MN-0100
ALLEN BRADLEY PROGRAMMING TERMINAL 1201-HA1 SER. B FRN 1.07
Allen Bradley Programmable Timer 700-FS-100JU23 Ser B 240VAC 48VDC 3A 3 A Amp
Allen Bradley Processor To Isolated Link, 1747C11, 1747-C11, Shipsameday#137F21
Allen Bradley Processor Module 1772-LW      #44376
Allen Bradley Processor Link Cable 1747-C11 Ser A      #36914
Allen Bradley Processor Expansion Unit 1745-E101 Ser A      #6828
Allen Bradley Pressure Switch     , 836-A106
Allen Bradley Pressure Switch 836T-T251J Ser A      #56414
ALLEN BRADLEY PRESSURE CONTROL SWITCH 600 VAC 836-A2
ALLEN BRADLEY Precision Limit Switch PBSJ2021 Series A
ALLEN BRADLEY PowerFlex ADJUSTABLE FREQUENCY AC DRIVE MANUAL 198666-P01
ALLEN BRADLEY POWERFLEX 70 POWER FLEX AC DRIVE COVER FRONT PANEL 74104-472-51 08
ALLEN BRADLEY POWERFLEX 70 POWER FLEX AC DRIVE COVER FRONT PANEL 74104-472-51 04
ALLEN BRADLEY POWER SUPPLY LOGIC BOARD 50389 REV. B *    *
ALLEN BRADLEY POWER SUPPLY 1606-XLP25A SER A
ALLEN BRADLEY POWER SUPPLY 120/220V AC POWER SUPPLY CAT. NO. 1771-P7 B
ALLEN BRADLEY POWER SUPPLY **1771-PA**
Allen Bradley Power Flex Quick Start Guide Manual FRN 5
Allen Bradley Power Flex 4 Quick Start Guide Manual, 4 FRN
ALLEN BRADLEY POWER FLEX 4 & 40 FRN 2.XX QUICK START MANUAL 7 Language With CD
Allen Bradley Power Block 135777 6RI100G-120B 6RI100G120B 100A 100 A Amp 1200V
Allen Bradley Potentiometer *    * RV4NAYSD104A Type J
ALLEN BRADLEY POSITION SELECTOR SWITCH CAT NO: 800T-H17 SERIES: N
Allen Bradley Polarized RetroReflective Photoelectric Sensor 42EF-P2MNB-F4 USG
Allen Bradley Pneumatic Timing Relay 849-N1A, One Set Instant Aux. Contacts -
Allen Bradley Plug In Time Delay Relay 0.1-10s 120VAC 700-HT22AA1 Series A NIB
Allen Bradley PLC-5/15 Processor Module
ALLEN BRADLEY PLC-5/12 PROCESSOR MODULE 1785-LT3 SER A 96844679
Allen Bradley PLC-5 Prog. Controller Processor Manual,
Allen Bradley PLC-5 Processor Assembly & Instructions Manual
ALLEN BRADLEY PLC-5 POWER SUPPLY MODULE 1771-P4S
ALLEN BRADLEY PLC-5 FAMILY LOCAL I/O BUS TERMINATOR CABLE 1 METER 1771-CX1 / A
ALLEN BRADLEY PLC-4 PLC4 MICROTROL PROGRAMMER (8346)
ALLEN BRADLEY PLC-2-FAMILY 1771-KG USER MANUAL PLC1519
ALLEN BRADLEY PLC-2 CABLE 1772-TR
allen bradley plc card CAT# 1771 -OD16 B ISOLATED 120V AC OUTPUT MODULE
Allen Bradley Plastic Latch for 800F Series Push Button - Lot of 8 800F-ALP
Allen Bradley Plastic Enclosure Cat #800F-2PP Type: 4,4X 3" X 5" X 2" (NIB)
Allen Bradley Pilot Relay 200-E200Z2 Series A
Allen Bradley Pilot Light Unit Transformer Type 120V 60Hz Series C 800H-PR16
Allen Bradley Pilot Light Unit Full Voltage 800H-QR20C
ALLEN BRADLEY PILOT LIGHT LIGHT OF 2 800T-PS16 SER T
Allen Bradley Pilot Light Kit (1481-N16A120)      Surplus
Allen Bradley Pilot Light 800T-Q20 240V AC/DC Series T
Allen Bradley Pilot Light 800T-PT16-White Ser T      #30430
Allen Bradley Pilot Light 800T-PT1