1756-CPR2 1756-CPR21756-CPR2 1756-CPR2

当PLC的用户程序要保留在RAM中时，就会用到电池，电池通常是3V或3.6V的不可充电的锂电池，电池的使用寿命通常是五年左右，电池用久了，电压就会下降，当其下降到不足以保证RAM中数据时，RAM中的程序就会丢失。如果用户没有备份程序，就会相当麻烦。[1] 

一般PLC内部设有电池电压检测电路，当电压下降到一定程度时，PLC就会报警，提醒更换电池。PLC的使用说明书都有提供更换电池的方法。一般来 说，PLC在断电后，因为PLC上RAM电源端接有充电电容，即使把电池去掉，电容上充电电量也足够RAM内的数据保持一段时间，所以如果取掉电池后在短 时间内（通常5分钟）再将新电池换上去，数据是不会丢失的。

但用户实际使用PLC的环境情况不尽相同，例如电容的容量下降，RAM电源回路有 灰尘、油泥等形成放电回路等，这会加快PLC断电后电容的放电速度，从而使时间不好把握。如果在带电的情况下更换电池就可保程序*。因为电源始终会 有电压加在RAM芯片的电源脚。当然更换时亦要小心应对，注意电池的极性以及避免短路情况发生。

是把PLC通电15分钟（给内部电容充电），断电，在5分钟内换好新的电池，再上电试一下。

西门子PLC有带卡的，有不带电池的；也有带卡的，带电池的。程序存在MMC卡中，如果没有存储卡，需要电池保存程序的，更换电池时候务必注意，带电的情况下，将旧电池取出来，然后将新电池换上即可。

Marathon 1423970 Power Distribution Block 600V 175A, USED

AMAT 0150-76217 EMC COMP. OPER PANEL, EXTENDED 46 FT,USED

AMAT 0190-13295 XFMR ASSY, 2KVA PRI 480/440/415/400/380V , NEW

AMAT 0870-01068 DRIVER, SERVOMOTOR 200VAC, 100W , USED

FUJI ELECTRIC AG22-L PUSHBUTTON 5AMP 250VAC LAMP28V 1.2W LED24V(SET), USED

JAMES ELECTRONICS 13967 POWER SUPPLY 120VAC 60HZ 270MA 24VAC/1.0A NO CORD , USED

AMAT 0020-77416 PIN CAP LOAD CUP, NEW

Varian 9698974 Turbo-V 551 C.U controller 120/220V 600VA , USED

AMAT 0010-21740 ASSY TC AMP 300MM, WORKING

SANYO Denki 109P1212H401 DC Fan 12V 120x120x25mm,USED

AMAT 0020-78033 COVER, ARM HOUSING , USED

AMAT 0021-26112 SST SEAL CLAMP, HEAD ASSY, PAD CONDITION, NEW

AMAT 0190-15988 SPECIFICATION ASSY HUB 8 CHANNEL PYRO/EM , USED

AMAT 0010-76535 ASSY, PNEUMATIC LOGIC BOX TILT CASSETTE , USED

AMAT 0010-09292 ASSY, TC AMP HOUSING GENERIC, REFURBISHED

AMAT 0870-01011 DRVR SERVOPACK AC SGC 400W 200V FOR SPE , USED

AMAT 3870-02675 VALVE PLUG MNL 75PS1 .1/4 FURON PV1-44 , USED

AMAT 0100-09071 SBC I/O BreakOut Board, SWITCHING POWER SUPPLY , USED

AMAT 0190-15402 Turck SNNE-04A-0007 DeviceNet Hubs, WORKING

AMAT 0010-30029 P-CHUCK LIFT , USED

SMC PSE564-01-28 VACUUM SERIES SENSOR,USED

AMAT 0140-78030 CABLE, WALKING BEAM MOTOR, POWER/ENCODE,USED

AMAT 0190-15401 Turck SDNL-0404D-0003S DeviceNet Hubs, NEW

AMAT 0010-76001 ASSY STORAGE ELEV WAFER CASSETTE HNDLR , USED

AMAT 0140-77303 HARN COVER SWITCH CONT,USED

Entrelec Schiele PS-L Systron Power Supply 24V, 0.75A , USED

AMAT 0140-78044 CABLE, SENSOR-CONTROL, BLKHD 2, SCRUBBER, WORKING

AMAT 0150-04167 CBL 75' REMOTE START/STOP CONT MF-BLKHD,USED

AMAT 1270-00008 SW TEMP RTD-IN SPDT-OUT FIELD CONFIG , USED

INTERLINKBT JBBS 57-E811 Bus Stop DeviceNet Hub with Voltage Monitor, USED

AMAT 1120-00088 PHOTOELECTRIC SWITCH FIBER UNIT, NEW

AMAT 0140-77432 CBL,SIGNAL,NOVA & MGSONIC,USED

AMAT 0040-64747 MAIN SHAFT, LOAD CUP, NEW

AMAT 0500-00018 CNTRL MOTION 8-AXIS W/DNET I/O , USED

MEIDEN 810-17073 CONTROLLER, COAT SLAVE SK2000 UA201/101A 2-39-63350

MKS 627B-15662 Baratron Capacitance manometer .02T KF25 15P 45C. , Refurbished

AMAT 0150-77060 CABLE ASSY,PAD COND CNTR,USED

AMAT 1350-01106 XDCR PRESS 0-250PSIA 1/4 VCR-F/F4-20MA B , NEW

AMAT 1200-00025 RLY TIMER DPDT MULI-FUNCTION 24V 8A W/ , USED

DNS 50480-1006 2-39-64334 KAWASAKI ARM ROBOT ASSY TRANSFER UNIT SK2000, NEW

AMAT 0020-34694 LINER, GDP, R2 OXIDEGECO , REFURBISHED

AMAT 0140-75368 HARNESS ASSY DRIVES INTERCONNECT, CMP CO , USED

AMAT 0021-77505 JIG, SUPPORT PAD, WORKING

AMAT 0010-10033 CERAMIC WAFER LIFT , USED

AMAT 0022-77001 BODY, 4 SLURRY DISPENSE ARM, MIRRA CMP, NEW

AMAT 0140-77096 REV P3 KTC , USED

AMAT 0100-01664 PCB ASSEMBLY, BRUSH TORQUE AMP-FILTER CM , USED

AMAT 0140-77140 CABLE, BACKPLANE BOARD , USED

AMAT 1080-01243 MOTOR SGM SERVO 100W 200VAC W/INCR, NEW

Rocketport 3000002 Interface 8 port RS232/RS422 , USED

SMC IRV2000-02B-R Precision Regulator 100-1.3Kpa Output , USED

AMAT 0190-01428 Pulsed Bipolar Supply POLARA-260A 260-01 , NEW

AMAT 1350-00250 MEG LDM CHEMICAL TRANSDUCER, NEW

PHOENIX CONTACT SACB-10/3-L-M16 Actuator Box , USED

SMC INA-14-47-04 Check Valve , USED

AMAT 0140-77645 CBL PLATFORM BULK HD,USED

AMAT 0010-11591 ASSEMBLY, BELT TENSIONER, INTERNAL, BRUS, NEW

AMAT 0150-77098 CABLE ASSY KEY BD/ MNTR EXTENDER,USED

AMAT 3870-05061 SLIT VALVE, MONOVAT RECTANGULAR 0340X-CA24-BMB1 , NEW

AMAT 0620-00122 ABLE ASSY RS-232 55FT DB9-F/F W/LABELS,USED

AMAT 0020-27309 COVER RING 8 TI 101%, NEW

TAKIGEN B-461-1-5 GAS DAMPER ,USED

Entegris 6500-T2-D00-L-0P2-U1 INTEGRATED FLOW CONTROLLER, WORKING

AMAT 0020-09297 BRACKET VERTICAL PLATE MOUNT , USED

AMAT 0020-09295 BRACKET, HORIZONTAL PLATE MOUNT , USED

Potter & Brumfield KHS-17D12-24 Hazardous Locations Use 24VDC 1/10HP 3 Am , USED

ACROMAG 822A-0200 INLIPACK DUAL ALARM , USED

FESTO PC9905 Rev A , USED

AMAT 0150-09607 CABLE ASSY,FLOW SWITCH, CVD, SST , USED

AIRTROL F-4200-100 PRESSURE ELECTRIC SWITCH , USED

SMC IS1000 Mechanical Pressure Switch , USED

Clippard EV-3M-24VDC, Lot Of 4 valve , USED

AMAT 0090-76106 ELEC. ASSY THERMAL CIRCUIT BREAKER 20A , USED

Clippard EV-3M-24VDC Lot Of 20 valve AIR 60PSI , USED

AMAT 0150-09244 CABLE ASSY EXPANDED GAS PANEL FLOW SWITC , USED

AMAT 0150-09101 CABLE ASY OZONATOR CONTROL B , USED

AMAT 0050-10315 N2 INLET WELDMENT, LOAD LOCK VENT , USED

AMAT 0050-30501 PLMB,WLDMNT,HE IN,SLOT 5-GAS PNL , USED

Turck VB 80.5-5 Multi Box 8 Port, USED

AMAT 0660-00602 CARD VME 6U 68040 CONFIG PC , USED

SMC NZL112-G Multistage Ejector, USED

KEPCO RAX48-3.6K POWER SUPPLY, 48V 3.6A, USED

MITSUBISHI SD-N125 CONTACTOR POLE 3, 24VDC, USED

AMAT 0010-14246 ASSY, 100-500CC SINGLE CHANNEL, SLURRY D, WORKING

AMAT 0190-22676 PROBE ASSEMBLY, RTA, SC ECP, NEW

SHIMADZU 206-20211-91 OSU, POWER UNIT ( removed from EBARA FREX300S CMP )

AMAT 0040-77192 PIN,ANTI-ROTATION , USED

OMRON GT1-DA04 ANALOG UNIT 24V 0.1A, USED

ORIENTAL MOTOR MRS18-BTM PRIX AC FAN, AC100V, AC115V, USED

ORIENTAL MOTOR MRS16-BTM PRIX AC FAN, AC100V, AC115V, USED

Patlite BC-24LF Corpation, USED

ILUFA SEKI SEISAKUSHO UT0C1-US4506BW IKURAFAN PAN,115VAC50/60Hz,PAN-SENSOR, USED

Omron  GT1-ID16DS,GT1-OD16DS Digital I/O Input Terminal Module,USED

ORIENTAL MOTOR MD925A-24L ORIX DC BRUSHLESS FAN, DC 24V 0.12A, USED

AMAT 0190-17056 SCR LAMP DRIVER 15 ZONE RADIANCE, USED

Matsushita Electric EB1114 BUZZER, USED

AMAT 0020-77377 CLAMP, SWEEP, DRIVE GEAR, USED

AMAT 0020-77372 GEAR, SWEEP, DRIVING, USED

AMAT 0040-77574 BLADE WLDNG WAFER ROBOT WRIST ASSY, USED

SCHNEIDER ELECTRIC ZB6EB3B Light Module,USED

AMAT 0150-20143 WIRE, JUMPER 4PIN CONN, GEN RACK EMO, USED

AMAT 0720-04833 CONN ADPRT QDS(M) TO QC(M) , NEW

AMAT 0720-03743 CONN DNET TRUNK TERMINATOR 5 POS CIRC 7 , NEW

AMAT 0140-78038 CABLE, RJ45 TO SECS, 75FT, NANO 9000,USED

ORIENTAL MOTOR UDK5128NA Super Vexta 5-PHASE DRIVER AC 100V, AC115V, 7.5A, USED

AMAT 0150-77212 CABLE, PLATFORM BKHD,CONT BKHD,USED

AMAT 0150-05888 CABLE ASSY POWER, PAD CONDITIONER,CONT,USED

AMAT 0720-05235 CONN TEE DNET DROP RSM-FKM-RKN , NEW

AMAT 0150-77076 CBL ASSY,20FT ANALOG I/O,USED

AMAT 0720-01592 CONNECTOR, SOCKET CLAMP , NEW

AMAT 0150-77075 CBL ASSY,20 FT,CNTRL BK,USED

AMAT 0010-77795 SPRAY BAR ASSY, HIGH PRECISION , USED

AMAT 0150-02687 CABLE ASSY, CNTRL BK, MNFRM BLKHD,USED

AMAT 0150-77078 CBL ASSY,20FT CNTRL BK PL,USED

AMAT 0150-77073 CBL ASSY,20 FT PWR, PLATE,USED

AMAT 0150-77074 CBL ASSY,20FT PWR PLATEN,USED

AMAT 0010-14390 BRUSH MODULE NEW EXTENDED ROLLERS ASSY , USED

AMAT 0140-16382 HARNESS ASSY 30 FT WITH FPD POWER INTERC,USED

AMAT 0090-77110 ASSY, SLIPRINGS , USED

AMAT 0021-23335 LOCK SPLASH GUARD HOUSING SCRUBBER , USED

OMRON GT1-AD08MX ANALOG UNIT 24V 0.1A, USED

OMRON GT1-OD16CST GT1-BSCO2 DIGITAL UNIT, 24V 16POINTS, USED

AMAT 0200-89015 SHAFT, WAFER LIFT, 9.0 BC , NEW

SMC EX140-SDN1-X116 Valves Serial Unit Devicenet Interface 10x SV2,USED

AMAT 0040-77401 DDF3 TBG SPRT, USED

YASKAWA CIMR-J7AA20P7 VS mini J7 Inverter 230V, USED

AMAT 0040-84050 MOUNTING BLOCK, ADJUSTABLE ASSY, BRUSH M , USED

KEYENCE SJ-R132 CORPORATION , USED

AMAT 0140-77812 HARNESS, ROBOT ENCODER, MNFRM-CNTRLR 75',USED

SMC EX140-SDN1-X116 Valves Serial Unit Devicenet Interface 8x SV2,USED

LAMBDA JWS150-15/A POWER SUPPLY 15V 10A, USED

AMAT 0150-77209 CONTROLLER ADAPTTER, MAINFRANE ADAPTER,USED

AMAT 0010-23795 BRUSH MOUNT ASSY, Q.C. 4.3, FLOW THRU, BRUSH MODULE 200MM , USED

TOKYO ELECTRON 3884-200164-12 FORMULA 3881-020010-12 3808-020005-11, USED

TOKYO ELECTRON 3895-120917-11 TTLA08-11 F-MFC_AI_4 PCB, USED

AMAT 0150-77041 CABLE ASSY, DIGITAL I/OBP,USED

TOKYO ELECTRON 3881-020022-11 TTLE25-11 HCT3POS PCB, USED

AMAT 0150-77057 CABLE ASSY,HD ROT CNTRL,USED

AMAT 0010-25969 BEARING BLOCKS REV 4.3 FLOW THRU 300MM , USED

SMC LLD28-03-S11-X10, LVD20B-ST07-1-X24, VALVE, USED

AMAT 0040-80234 CROSS CROSS COVER VERTICAL, USED

AMAT 0026-48570 DEGAS MODULE, NEW

TOKYO ELECTRON 2184-020319-11 MC-31108A Omron B7A-T6D7, Short I/O Delay Model

SMC LVD20-S07-1-X13A VALVE, USED