ABB EI803F(3BDH000017R1)
PLC是一种监控装置,为了监视及控制各项机电等设备,当然必须与那些设备有相互沟通的方式.在这些机电设备的世界里,人类发明了各种形式的讯号,以作为它们之间的沟通媒介.目前来说,人们研发出来的各种侦测如:温度,湿度,压力等自然现象的侦测元件,都是将所测得的数据转换为线性对应的电流信号,通常是4~C接受这样的信号,就可依据电流的大小而知道侦测器侦得的目前状况.Pulse(脉冲)信号是一种形式的接点信号.它的意思是每"达到条件"时,接点会闭合一次.例如:某个转轮式的流量计,可能被设计成--当它计算出水流累计量达到一度时,就将输出接点闭合一次.至于所谓的RS232讯号,乃是指一种"通讯"的方式(RS232是一种电气规格).以上所提的各种信号都是电气形式的讯号.而且每个信号都需要***的线路来作传递.通讯的方式,则可以把它当作设备用"交谈"的方式来做沟通.它们彼此间以一串行的数值信号来组成所要传递的资料,使得多样化的资料能够借由一组通讯线路来达成.4~20mA算是通用规格.另外常见的还有0~20mA.另外还有电压式的:0~5V,1~5V,0~10V,等等.当然还有以其他形式来表达自然环境中各种"连续性"数值的方式,像是:电阻式,以及其他变化应用.总之呢,4~20mA的规格***多.但是,事实上,4~20mA的电流信号,在进入电路板时,还是会串上一个250或500欧姆的电阻,而获得一个1~5V或2~10V的电压,然后再由A/D(类比/数位)转换IC得到一个对应的数值.这个"5V"或"10V"的原因,乃是人们研发出来的A/DIC***容易且廉价的关系而已.至于为何以电流的方式较多,因为4~20mA控制电流不易因传送距离较长而导致讯号衰减。
MAC 57C-12-522BABA VALVE *USED*
EBMPAPST 4580 Z *NEW OUT OF BOX*
GE MTMPLUS-120 *USED*
WATTS U5B *USED*
LOT OF 2 LEVITON 165-00ML3-00P *NEW IN FACTORY BAG*
NORGREN K41EA00-KS6KV2 *USED*
HAYSSEN 810A-0100-00AB *USED*
ALLEN BRADLEY 1784-KT SERIES B *USED*
SOLON PRESSURE SWITCH 2PSW1D2 *USED*
MILBANK 12126-HC1 *USED*
BROOKS FLOW METER 110CM45CMDAA *NICE*
HONEYWELL C645A 1022 PRESSURE SWITCH *USED*
GENERAL ELECTRIC 5KSP51GL *USED*
YAMATAKE SL1-E LIMIT SWITCH *NEW IN A BAG*
FALK 0246655 1050T HUB RSB *NEW IN A BOX*
SPIRAX SARCO VS-206 STEAM TRAP 3/4" *USED*
FARADAY 6114B-0-15-120-?60 HORN *NEW IN A BOX*
EMERSON FX-455 POSITIONING SERVO DRIVE *USED
FESTO DSNU-25-15-P-A *NEW OUT OF A BOX*
WEIDMULLER OST EG7 OPTOCOUPLER 24VDC *USED*
DANFOSS CI16 *USED*
GO SWITCH 7D-43658-DCA PROXIMITY LIMIT SWITCH *USED*
MARKEM 2050MAR PRE-HEATER *USED*
WILKERSON L01-02-M00 LUBRICATOR 1/4" *USED*
LOT OF 2 GENERAL ELECTRIC COIL 15D4G2 115V *USED*
MILLER FLUID POWER CYLINDER A72B2C (RUSTY AS PICTURED) ...
LOT OF 3 RELIANCE ELECTRIC 45C60 DUAL 115VAC, 2A OUTPUT...
M & P, INC. OIL FILTER, FILTER REGULATOR L28W-2 / CFR60...
LOT OF 7 MERLIN GERIN C60N 2A-TYPE B *USED*
STATIC O RING 6NN-Y3-N5-C1A *USED*
MAGNETEK JA2N12N# 31 1/25HP 115V SHADED POLE *USED*
ALLEN BRADLEY 20BD8P0A0AYNAND?0 SERIES B POWERFLEX 700 *...
TRANSDUCER TECHNIQUES TM-2 *NEW IN BOX*
DOMNICK HUNTER 2858-5 *USED*
IFM IF0311 *USED*
KB ELECTRONICS INC. KNMD-240D *USED*
PARKER PA36RX21 SOLENOID COIL 53VDC *USED*
CSI D24170/ 4500 16 CHANNEL MULTIPLEXER BOARD *USED*
NO***ON 109729A *NEW IN BOX*
ESCORT MEMORY SYSTEMS CM42 *NEW IN BOX*
BAILEY IMLM01 *NEW*
***C SOLENOID VALVE VG342-5DZ-04FA *NEW OUT OF BOX*
BALLUFF BES 516-3005-G-E5-C?-S49 *NEW IN FACTORY BAG*
SPRECHER + SCHUH 55-530282G002 *USED*
SENSUS 143-80-2HP NATURAL GAS REGULATOR *USED*
FIREYE E110 FLAME MONITOR CHASSIS & COVER, 120V *USED* ...
MARPOSS 679200001P *NEW IN BOX*
SEALED WILKERSON C18-04-FK00
W0-122773 CIRCUIT BOARD *USED*
LAMBDA LND-Y-152 *USED*
GFC POWER GH0F324-OVP POWER SUPPLY *NICE*
OMEGA PHOM-10AB NO POWER SUPPLY CORD *USED*
PILZ PNOZ X3 SAFETY RELAY *USED*
LOT OF 12 RITTAL PS4584 *NEW IN A BOX*
PILZ PNOZV30S3S1SZ/1?O *NICE*
WATLOW 93BA-1DD0-00RR *NEW IN THE BOX*
ALLEN BRADLEY 1A11 440V COIL *USED*
SWAGELOK SS-Q***-B-4PFK1 *NEW IN BAG*
BELLOFRAM 903078000 *NEW IN A BOX*
HOFFMAN D-AH8001B *NEW IN A BOX*
LENZE EVD533--E *NEW OUT OF A BOX*
MASTER PNEUMATIC DETROIT INC. CFR55-1L15 ( AS PICTURED)...
GENERAL ELECTRIC COIL 22D11G45A 50V *USED*
LOT OF 2 BALLASTRONIX INC. REPLACEMENT IGNITOR KIT BMS-...
TURCK N120V-G30-ADZ30?X2-B1131 *USED*
LOT OF 3 ADVANCE CONTROL TECHNOLOGY B40033AFD2B607 *USE...
***C CLAMP CYLINDER CK1T50-175Y2PN *USED*
LOT OF 4 RELIANCE ELECTRIC 45***2 DUAL ELECTRONIC INPUT ...
ALLEN BRADLEY LOGIX 5550 PROCESSOR UNIT 1756-L1 SERIES ...
WEED INSTRUMENTS SP451-PD.3-J-12?.0-A1.50-2006 *USED*
SOR 6TA-EE5-N4-C2A-?CGRR *USED*
NEWPORT 400AS-4-A3-D2 *USED* 120/240V
PARKER 71315SN2KNJ1N0D?1P1C2 *USED*
LOT OF 2 MERLIN GERIN C60N-84 TYPE B*USED*
LOT OF 2 CUTLER-HAMMER WMS3D20 415V *USED*
MICRO SWITCH FE-MLS2EA *NEW OUT OF BOX*
MSD, INC. 326XBX48P TIME DELAY RELAY *USED
TELEMECANIQUE XCK-M WITH ZCK-M1 LIMIT SWITCH *USED*
FOXBORO 763RNA-C 763RNA-C-E300-0?-0-0-0-0-0-0-0 *NEW IN ...
FINCOR 10428461 *USED*
CROUSE-HINDS AR-331 *USED*
PARKER VALVE ***-20BA
MAC 56C-13-501JC *USED*
SEW-EURODRIVE FSKF321EPH04/13?/06 *NICE*
LOT OF 2 TRI-TRONICS BF-B-36 *USED*
UNISTAT USIS-120QC *USED*
MERCOID CONTROL DA-41-2-23E *USED*
ALLEN BRADLEY 592-JOV16 SERIES B *USED*
ALEMITE 7118-1 *USED*
SIGNET 3-2720 PREAMPLIFIER *USED*
WESTINGHOUSE A201K4CA *USED*
HONEYWELL C6045D 1019 1 *USED*
MEASUREMENT TECHNOLOGY MTL221OB *USED*
OVC VALVE 2-CF8M *NICE*
GE SNUBBER CARD CF12014AAG01 *USED*
MAGNET AG GSU 50 Z.I *USED*
EFECTOR IM350 *NEW IN A BOX*
SENTROL INDUSTRAL 129-6N-12J *USED*
P *USED*