1、基本概念
我们生活在一个物质的中。世间所有的物质都包含了化学和物理特性，我们是通过对物质的表观性质来了解和表述物质的自有特性和运动特性。这些表观性质就是我们常说的质量、温度、速度、压力、电压、电流等用数学语言表述的物理量，在自控领域称为工程量。这种表述的优点是直观、容易理解。在电动传感技术出现之前，传统的检测仪器可以直接显示被测量的物理量，其中也包括机械式的电动仪表。
2、标准信号
在电动传感器时代，中央控制成为可能，这就需要检测信号的远距离传送。但是纷繁复杂的物理量信号直接传送会大大降低仪表的适用性。而且大多传感器属于弱信号型，远距离传送很容易出现衰减、干扰的问题。因此才出现了二次变送器和标准的电传送信号。二次变送器的作用就是将传感器的信号放大成为符合工业传输标准的电信号，如0－5V、0－10V或4－20mA（其中用得多的是4－20mA）。而变送器通过对放大器电路的零点迁移以及增益调整，可以将标准信号准确的对应于物理量的被检测范围，如0－100℃或-10－100℃等等。这是用硬件电路对物理量进行数学变换。中央控制室的仪表将这些电信号驱动机械式的电压表、电流表就能显示被测的物理量。对于不同的量程范围，只要更换指针后面的刻度盘就可以了。更换刻度盘不会影响仪表的根本性质，这就给仪表的标准化、通用性和规模化生产带来的无可限量的好处。
3、数字化仪表
到了数字化时代，指针式显示表变成了更直观、更的数字显示方式。在数字化仪表中，这种显示方式实际上是用纯数学的方式对标准信号进行逆变换，成为大家习惯的物理量表达方式。这种变换就是依靠软件做数学运算。这些运算可能是线性方程，也可能是非线性方程，现在的电脑对这些运算是易如反掌。
4、信号变换中的数学问题
信号的变换需要经过以下过程：物理量－传感器信号－标准电信号－A/D转换－数值显示。
声明：为简单起见，我们在此讨论的是线性的信号变换。同时略过传感器的信号变换过程。 假定物理量为A，范围即为A0－Am，实时物理量为X；标准电信号是B0－Bm，实时电信号为Y；A/D转换数值为C0-Cm，实时数值为Z。
如此，B0对应于A0，Bm对应于Am，Y对应于X，及Y=f(X)。由于是线性关系，得出方程式为Y=(Bm-B0)*(X-A0)/(Am-A0)+B0。又由于是线性关系，经过A/D转换后的数学方程Z=f(X)可以表示为Z=(Cm-C0)*(X-A0)/(Am-A0)+C0。那么就很容易得出逆变换的数学方程为X=(Am-A0)*(Z-C0)/(Cm-C0)+A0。方程中计算出来的X就可以在显示器上直接表达为被检测的物理量。
5、PLC中逆变换的计算方法
以S7-200和4－20mA为例，经A/D转换后，我们得到的数值是6400－32000，及C0=6400，Cm=32000。于是，X=(Am-A0)*(Z-6400)/(32000-6400)+A0。 例如某温度传感器和变送器检测的是-10－60℃，用上述的方程表达为 X=70*(Z-6400)/25600-10。经过PLC的数学运算指令计算后，HMI可以从结果寄存器中读取并直接显示为工程量。
用同样的原理，我们可以在HMI上输入工程量，然后由软件转换成控制系统使用的标准化数值。
在S7-200中，(Z-6400)/25600的计算结果是非常重要的数值。这是一个0－1.0（100％）的实数，可以直接送到PID指令（不是指令向导）的检测值输入端。PID指令输出的也是0－1.0的实数，通过前面的计算式的反计算，可以转换成6400－32000，送到D/A端口变成4－20mA输出。
以上讲述的是PLC中工程量转换的基本方法，程序的编写则因人、因事而异。但是万变不离其衷。如果大家感兴趣，我可以给出自己编写的程序供大家参考，同时也希望各位网友不吝赐教、互相交流。
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NEW GILBARCO MARCONI T-12517-G1r LOGIC BOARD G-1
ITE SIEMENS 6500 SIZE 2 MOTOR STARTER 50 AMP BREAKER MCC MCCB BUCKET
NEW SIMPLEX FIRE ALARM 4100-1246 BOX SEALED!! NAC MODULE FLEX 50 742-539
4D7APXID-211-E 4D7APXID211E 51301582 REV C HONEYWELL BOARD #15
HONEYWELL SERIAL LINK MODULE BOARD 621-9939
New Asco 8266D170L/F484488 1/2" pipe 15.4 watt valve
Square D Lighting Contactor 8903 SQG11 600 V 100 AMP 120V COIL 8903SQG11
EST EDWARDS MN-ABMN AUDIO BRIDGE PRE-AMP MODULE
GE 7700 SERIES SIZE 1 MOTOR STARTER 40 AMP CIRCUIT BREAKER MCC BUCKET HOA
GE 7700 SERIES SIZE 2 MOTOR STARTER 40 AMP CIRCUIT BREAKER MCC BUCKET HOA
CPC LDS ZONE SENSOR REFRIGERANT LEAK ALARM 809-160 COMPRESSOR RACK
Bently Nevada 3500 3500/15 3500-15 Ac Power Supply
WESTINGHOUSE GCA-530 SIZE 5 AC CONTACTOR 300 AMP 3 POLE 600V W/480V COIL
Benshaw CBRSM6B-250-480-12 Integral Bypass 260Hp 480V 312 Amp No Backplate
Foxboro Electrodeless Conductivity Analyzer 873EC-AIWFNZ 2NO/NC 5A120VAC
ITE SIEMENS 6500 SIZE 2 MOTOR STARTER 50 AMP BREAKER MCC MCCB BUCKET FLEXOPULSE
GE 7700 SERIES SIZE 2 STARTER CONTACTOR 60 AMP 600V F MCC BUCKET NO DOOR
SQUARE D MODEL 6 SIZE 1 MOTOR STARTER 3 AMP BREAKER MCC MCCB BUCKET
sti microsafe mc 4700 mc47lr-20-450-x safety light curtain sensor banner
NEW JOSLYN CLARK CONTACTOR, 7442-1020-11, SIZE 2, 240VDC
NEW GILBARCO MARCONI W02437-G1R 323923 POWER SUPPLY BOARD
NEW SMC ITV2030-01N2L4 PNEUMATIC RELULATOR E/P WITH CABLE 4-30 MADC 0.7-70 PSI
GE 7700 SERIES 60 AMP FUSIBLE F HALF 6'' MCC MCCB BUCKET
GE 7700 SERIES 30 AMP FUSIBLE F HALF 6'' MCC MCCB BUCKET
ITE SIEMENS 6500 SIZE 1 REVERSING MOTOR STARTER 25 AMP BREAKER MCC MCCB BUCKET
Johnson Controls Network Controller w/o arcnet NU-NCM300-1 Metasys
New ABB Control Main Contacts KZD NC SK825 202-A EHDBCK220-NC
JEOL EDA 3-PB SP000425-00 CIRCUIT BOARD CARD
MicroTherm 500A 9T59 0816BOIOL-186 Computer for Boiler 110V 6A
SQUARE D CM-2250 CLASS 3020 POWER LOGIC CIRCUIT MONITOR
Bently Nevada 3300/16-03-01-02-00-00-00 Dual Monitor XY/GAP Monitor Board
Bently Nevada 3300/20-02-01-02-00-00 Dual Thruster Monitor Card Module
NEW PULNIX PB-50F PHOTOELECTRIC BEAM SENSOR
O-Z/GEDNEY EXPLOSION PROOF LIGHT FIXTURE, 120/208/240/277V, 400 WATTS
WESTINGHOUSE CUTLER HAMMER TYPE W SIZE 1 STARTER 3 AMP BREAKER MCC BUCKET DOOR
WESTINGHOUSE 11-300 12 SPACE BREAKER PANEL PANELBOARD MCC MCCB BUCKET
EMERGENCY POWER ENGINEERING 5-00271-00D 8432-416
ALLEN BRADLEY DATALINER, DL20 MESSAGE DISPLAY, REV 62A
NEW GILBARCO MARCONI T16925-P1R T-16925-P1R KEYBOARD BOARD
NEW BARKSDALE HI PRESSURE SWITCH P1X-J340SS-T EXPLOSION PROOF
NEW GILBARCO MARCONI T20138-G1R T-20138-G1R POWER SUPPLY CIRCUIT BOARD
NEW GENERAL ELECTRIC GE CR463L40AJA10A0 30 AMP 4 POLE LIGHTING CONTACTOR 120V
ALLEN BRADLEY FUSIBLE 60 AMP FUSIBLE F FEEDER MCC MCCB BUCKET
5d73402G01 POWER SUPPLY DC-DC CONVERTER GQ1003-7R GQ2541-7R
BROWNING C950X 2 7/16 TAPERED ROLLER BEARING INSERT 2-7/16" SHAFT
CUTLER HAMMER UNITROL F10 SIZE 1 MOTOR STARTER FUSIBLE MCC MCCB BUCKET
CUTLER HAMMER UNITROL F10 SIZE 1 2 MOTOR STARTER FUSIBLE FEEDER MCCB MCC BUCKET
GE 7700 SERIES SIZE 1 MOTOR STARTER 30 AMP 600V F MCC MCCB BUCKET
NEW DANFOSS V02 VO2 AH108020 VARIABLE OUTPUT BOARD
GE 7700 30 AMP 600V FUSIBLE F HALF 6'' FEEDER MCC MCCB BUCKET
GE 7700 60 AMP 600V FUSIBLE F HALF 6'' FEEDER MCC MCCB BUCKET
New Phoenix Contact Converter Module MCR-CLP-UI/I-4
APPLETON MERCMASTER III MLBRG355QA1 EXPLOSION PROOF LIGHT LAMP 55W 90-140V
NEW JOSLYN CLARK 7001-8040-11 CONTACTOR 40 AMPS 500VDC 120V COIL 3 POLE
NEW SQUARE D POWER LOGIC PM650 3020 METER MODULE ENCLOSURE
NEW SIMPLEX FACTORY SEALED 4100-0622 DIGITAL AUDIO RISER 742-535 CIRCUIT BOARD
new FYH UCF315 48G5 MOUNTED BEARING
New Allen Bradley 700-R500A1 Electrically Held Relay 120V Coil Series B Type R
DANFOSS V02 VARIABLE OUTPUT BOARD AH098009 AA088210
ITE SIEMENS 5600 5640 DUAL 60 AMP BREAKER FEEDER MCC MCCB BUCKET
Square D FGA 3 pole 45 amp 480Y/277v FGA34045 PowerPact Circuit Breaker Paint
SQUARE D 8020 SCP111 SY/MAX MODEL 100 CONTROLLER WITH MEMORY MODULE
AVDEL 727 AIR RIVETER WITH FOOT PEDAL
New TELEMECANIQUE XAPG392036080064 Control Station Enclosure
AMX RAD-INC Incandescent Dimming Module 2400W 277v 10A Input 277V 2400 watt
GILBARCO MARCONI VERIFONE Q13086-101 G-SITE CIRCUIT BOARD CORE
CPC COMPUTER PROCESS CONTROLS RS485 ALARM 811-4850 CONTROL PANEL ALARM
Square D 8903PBM10V02 Lighting Contactor 600v Volt 30 Amp 120 Volt Coil
GILBARCO MARCONI VERIFONE T20229-G1 T20229-GX ADVANTAGE CARD CAGE ASSEMBLEY
SQUARE D MODEL 6 SIZE 1 MOTOR STARTER 30 AMP FUSIBLE FEEDER MCC MCCB BUCKET
FIREYE 45UV5 MODEL 1005 SELF-CHECKING UV SCANNER 1 INCH NPT MOUNT
RAMSEY CONTROLS BN176 REV. INV. TRIGGER
NEW NO BOX Simplex panel card 4100 565-333G 565-333-G UT MASTER CONTROLLER
NEW GILBARCO MARCONI PETRO VEND MBR 213 DUAL TRACK CARD READER
NEW GILBARCO MARCONI BLACK BOX COS 2 SWED55545 OPERATED SWITCH
NEW GILBARCO MARCONI K93062-02 UPGRADE KIT TCR-G TCR-G2
NEW GILBARCO MARCONI 22196-01 13880-01 SERVICE CONSOLE KEY PAD
INDRAMAT AS31/006-000 POWER SUPPLY AC SERVO CONTROLLER MODULE SOFTWARE #6
INDRAMAT NFD02.1-480-130 POWER SUPPLY AC SERVO CONTROLLER FILTER DRIVE #4
INDRAMAT KDA-02V3.05 POWER SUPPLY KDA CONTROLLER MODULE SOFTWARE #3A
INDRAMAT MSP1V0.7 KDA3.2-050 POWER SUPPLY SERVO CONTROLLER MODULE SOFTWARE #7
SQUARE D MODEL 6 SIZE 1 MOTOR STARTER 3 AMP BREAKER MCC MCCB BUCKET MISSING
NEW TURN-ACT TURN-DEX 422-2-000 ACTUATOR WITH UNIDIRECTIONAL CLUTCH 2-1/2" BORE
WATTS F602-16WJ FILTER 1" NPT MAX PRESSURE 250PSI MAX TEMP 150F
NEW VORTEC VORTEX COOLER MODEL 721
CPC COMPUTER PROCESS CONTROLS RS485 ALARM 811-4850 CONTROL PANEL WHITE
CRESTRON CRESLITE SYSTEM 7 CL6 SIX-MODULE LIGHTING CABINET
new MICRO SWITCH FE-MLS-5EB PHOTO EYE SENSOR
BOSCH 0 608 101014 EC MOTOR 463 006 3.1 AMP 23 MAX AMP
NEW NATIONAL INSTRUMENT 192323B-02 779312-01 PCI 6521 8 CH/CH ISO CARD
INTELLIGENT ACTUATOR, IS-S-Y-M-16-60-400, 24" SLIDE
NEW UNIVER MILANO, ELECTRIC AIR CYLINDER, LAP40ODE095T
NEW SMC LINEAR SLIDE, PNEUMATIC GUIDE CYLINDER, MGPM50N-100B-XC8
GE 7700 SERIES SIZE 2 MOTOR STARTER 30 AMP CIRCUIT BREAKER MCC MCCB BUCKET HOA
GE 7700 SERIES SIZE 1 REVERSING MOTOR STARTER 15 AMP BREAKER MCC MCCB BUCKET
microtek controls model ticr500 interface module disp card plc
SIMPLEX BUILDING COMMUNICATION SYSTEM 5120-9190 POWER SUPPLY
Barber-Coleman Network 8000 Local Control Module LCM-84110-1 Fire Alarm
Siemens HE HE63B100 3 pole 100 amp Circuit Breaker
GENERAL ELECTRIC GE TKM TKM836Y800 600 volt 3 pole 800 amp Circuit Breaker SHUNT
Speed Controller MSE402 Board Inside w/ Rittal Outer Box Fire Alarm
SQUARE D MODEL 6 SIZE 1 MOTOR STARTER FUSIBLE F FEEDER MCC MCCB BUCKET
NEW COILHOUSE PNEUMATICS L340MB LUBRICATOR 3/4" NPT 250PSI MAX
Square D FGA 3 pole 40 amp 480Y/277v FGA34040 PowerPact Circuit Breaker
New Allen Bradley 505-BOD-A2C Size 1 Reversing Starter E1 Plus 600v 120v Coil
NEW ONO SOKKI RP-0432Z ROTARY ENCODER SIG 1000 P/R
Simplex 565-878 Circuit Board With 565-560 Board Fire Alarm
Simplex 565-486 Circuit Board with 565-560 Board Fire Alarm
NEW 4" ABZ VALVE 401-100 ABZOLUTE BUTTERFLY VALVE WITH MANUALLY OPERATED LEVER
UNITED ELECTRIC E117-3BS TEMP SWITCH RANGE 100-400F/37.8-204.4C MAX TEMP 450F
MEDAR INC 7623-3M2 PC BOARD 7620-3
ALLEN BRADLEY 2100 FUSIBLE MOTOR STARTER 150 AMP FUSIBLE FEEDER BUCKET
SIMPLEX 4606-9101/9101C LCD ANNUNCIATOR DISPLAY ##
SIEMENS 3RX2-10 3RX2110 EVALUATOR CONTROL UNIT
NUMATICS SPS075X51ZCX POWER SLIDE SENSOR 3/4" BORE 1/2" STROKE W/ 2 CS-2OTP-QD
GILBARCO MARCONI M01560A001R MICRO READER BOARD CORE
NEW ALLEN BRADLEY 609-XCX SER.J 1P NEMA 4X MANUAL STARTER SWITCH SINGLE PHASE
GE 7700 SERIES SIZE 1 MOTOR STARTER 30 AMP FUSIBLE F MCC MCCB BUCKET
GE 7700 SERIES SIZE 1 MOTOR STARTER 30 AMP FUSIBLE F MCC MCCB BUCKET LIGHT
NEW PANDUIT TTC8YS-10 THERMAL TRANSFER LABEL ROLL OF 10000 1 PER BUY
GE 7700 SERIES 30 AMP FUSIBLE F FEEDER SIZE 1 STARTER MCC MCCB BUCKET
New in Box Siebe Environmental Controls MPC-2P0 Pneumatic Output Module
Square D 8536SEO1H10S Size 3 Motor Starter SR310 Motor Logic 30-90 Amp 120v Coil
GILBARCO MARCONI 23533-01 SPARE KEYBOARD 120 KEY BOARD CORE
WESTINGHOUSE CH TYPE W SIZE 1 STARTER 30 AMP BREAKER MCC BUCKET NO DOOR
Homer Electric HE693ASC900E Module PLC Horner
ANTENNA ASSEMBLY 1-301048-J21 001301048J21
NEW ROTARY LIFT DOVER FJ699
FINN-AQUA AUTOCON 2 IO DIO 31113 V9203 PLC CIRCUIT BOARD
FINN-AQUA AUTOCON 2 IO ADIO 31113 V9203 PLC CIRCUIT BOARD
FINN-AQUA AUTOMATION CPU FF V9307 ACS 30838 PLC CIRCUIT BOARD
CUTLER HAMMER 2100 SIZE MOTOR STARTER BREAKER FEEDER EMPTY MCC MCCB BUCKET
light curtain sensor banner sti beam array bmlv18c
NEW GILBARCO MARCONI K-93744-09 BOX OF 6
NEW GILBARCO MARCONI M01564A001 CIRCUIT BOARD
NEW ASCO HC8344G70 SOLENOID VALVE AIR,GAS,WATER 10-125 PSI LT.OIL 25-125 PSI
SQUARE D MODEL 6 SIZE 1 MOTOR STARTER 8536 FUSIBLE F FEEDER MCC MCCB BUCKET
ALLEN BRADLEY 809-A01E 600V TRIP RELAY
ASCO 920 Remote Control Switch Contactor 926 3 Pole 60 Amp 600V 600CY
ALLEN BRADLEY 117404-TT250N 10B4 POWER BLOCK DUAL SCR
NEW SQUARE D 9065TJF40 9065 TJF40 CURRENT TRANSFORMER WITH LR2D13 OVERLOAD RELAY
new pcb813327 813782 sensor inlet
NEW SQUARE D IFL IFL24070 2 POLE 70 AMP CIRCUIT BREAKER
GILBARCO MARCONI M01608A001 MAIN POWER SUPPLY CORE
controller sti light curtain banner minisafe ms4328 burned
sti light curtain banner controller ap400b
light curtain banner controller optosafe p4100b-2 p4124b-2
JEOL EVACI PB SP000466(00) CIRCUIT BOARD CARD
Andover Controls CIU 3 01-1000-314 display PCB Board
NEW Simplex FIRE ALARM 4100-5015 8 ZONE CLASS A MODULE 565-231 REV D
NEW TELEMECANIQUE SQUARE D A66PI PCMCIA COMMUNICATION CARD SIEMENS ALTIVAR 66
New Cooper Lighting Emergency Light Sure-Lites UEL1SD 120/277 V 12 W
Festo DGP-11/4"-31"-PPVA B Pneumatic Linear Actuator Drive 1-1/4" Bore 31"Stroke
CIRCLE SEAL RELIEF VALVE, M5162N-6M(L), SET @ 588, 3/4" PIPE, ASME AIR CAP
SIMCO RAMIC CORP SRC PCB ASSY FBSU VGA 94-160293-004 REV A W/94-162372 #7
ESI Elevator Systems Access Board Rev B Circuit Board Card 019-1434
ESI Elevator Systems Door Board Circuit Board Card 021-1433
Allen Bradley Flame Monitor EB-700 Eng Code 3 91090015 Fire Alarm E-1001 Fireye
Allen Bradley Flame Monitor EB-700 Eng Code 3 93340089 Fire Alarm E-1001 Fireye
New Telemecanique 3 Phases Voltage Monitoring Relay
WESTINGHOUSE LB LB3400F 3 POLE 125 AMP TRIP CIRCUIT BREAKER LB3125
NEW BOSTON GEAR 700 SERIES, SPEED REDUCER, F713-30-B5-G, 1.0SF@1750 RPM,
Converter Concepts Inc CS90134 90-250V Power Supply 3 Amp Freq 44-440 Hz
SYNERGISTICS ACCESS CONTROL PANEL BWJUMP.PM3-4/92 CONTROL PANEL
NEW NO BOX SPACE AGE ELECTRONICS YM9050 LMW METAL LEXAN ENCLOSURE
Positron 7501-24 750124 4 Wire Data Isolator
Sharp Ladder Processor Z-100LP1 Z-100-LP1
BAILEY infi 90 NAMMO3 NETWORK ANALOG MASTER 6637203D1 #48
FIREYE EB-700 AUTOMATIC PRIMARY FLAME MONITOR #2
KILLARK EXPLOSION PROOF LIGHT HZJ-71G-HZP2 120V 250 WATT MERCURY VAPOR
JEOL SP000277-00 ANP-PB FIRE ALARM CIRCUIT BOARD CARD
HONEYWELL DCM MODULE BOARD 620-0048
MPCS-3 POWER CHANGEOVER MODULE
RAMSEY CONTROLS 2411-1/258 DRIVE TACH FBDK
NEW BIMBA 5024-DXP PNEUMATIC CYLINDER 2-1/2" BORE 24" STROKE
Siemens MPC6-DB 6000 Main Display Board
DAY Control Products OM-1000E Board Card
JEOL LED DISP PB SP000324-01 SP000325-02 LED CONT PB CIRCUIT BOARDS CARD
FIREYE E300 EXPANSION MODULE WITH EB700 CHASIS FIRE ALARM SAFTEY
LANDIS & GYR POWER AO-V BOARD 02 533-680 537554 Z8AV8 CIRCUIT BOARD CARD 600 SCU
Flowserve Single Cartridge Pump Seal Series 84 R84-14SA R8414SA
ITE SIEMENS QJ QJ23B09000s01 3 POLE 90 AMP BREAKER SHUNT TRIP S01QJOR3
SERVOTRONICS OPT-MN MOTION CONTROLLER CIRCUIT BOARD
Non-Linear Systems 8000-1-1-04-60 8000110460 120V Ac Signal Module
PYROTRONICS 580-184139 REV I VCI5 CIRCUIT BOARD MAIN BOARD
yaskawa cimr-f7u40p4 AC Drive VFD .75hp 480v 460v 400v 380v 50/60hz 3/4hp
Siemens 3TF52 w/ 3UA62 OL Motor Starter 50HP 90 Amp 600v Volt 120v Coil size 4
FPE NFJ 3 Pole 225 Amp NFJ631225 Circuit Breaker
VACUUM PUMP MOTOR .55KW .73HP 3/4 220/380V 1330RPM
NEW CONTROL TECHNOLOGY 2589-A 8/16/32 POINT UNIVERSAL DISCRETE INPUT MODULE cti
VFD VARIABLE SPEED DRIVE AC 6MB400P5 6MDDN-1P4102
HOSTILE DUTY HW10EL9C2-C 215T 3PH 10HP 460V COOLING TOWER DUTY 2 SPEED AC MOTOR
DATA INSTRUMENTS D42351-02 REV F D50640 REV F CIRCUIT BOARD CARD
NEW TELEMECANIQUE MOTOR PROTECTION MODULE 6 - 10 AMP 690V MAX OVERLOAD RELAY
genesis kbn2-4303-1 460v 3hp ac drive 3 hp 3 phase
genesis kbn2-4303-1 460v 3hp ac drive 3 hp 3 phase missing bottom half
ALLEN BRADLEY AB 1333-AAA 1hp 230V 208V 200V 2.6KVA 3ph SER B AC DRIVE SER D
eaton mmx12aa7d0f0-0 ac drive starter soft start 2hp 240v single phase 1
DANFOSS GT2CN1STR0DLF00A00 10HP 240V 3PH AC DRIVE 6000c31
New Notifier JLIB-200 Fire Alarm Interface Board
SIEMENS 6FX11202CA00 6FX1120-2CA00 MEMORY MODULE CARD
NEW GILBARCO MARCONI W01854-G7R W0-1854-G7R REGULATOR BOARD
Bailey Controls IMASI02 Infi 90 Analog Input Slave +5 +- 15V DC 1 Watt 6637626G1
Bailey Controls IMASI02 Infi 90 Analog Input Slave +5 +- 15V DC 1 Watt 6637626D1
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