16AYC10B
日期：2018-9-71、基本概念
我们生活在一个物质的世界中。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（其中用得最多的是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、更精确的数字显示方式。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。 咨询热线：18150695049
诚信经营，质量为首，诚信至上，鼎晟达竭诚为您服务
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ROSEMOUNT 333DC2 TRI-LOOP CONVERTER HART *NEW IN BOX*
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FISHER- ROSEMOUNT VE4002S2T1B1, #606793, #12P0558X152, L001492384, NEW- IN BOX
Rosemount Hart 3051 CG5A22A1AB4E5QTTR Pressure Transmitter NIB
Rosemount Smart Family CG4A23A2AS1B4E5 Pressure Transmitter NEW
Rosemount 3051 CD2A22 Smart Digital Pressure Transmitter NIB
Rosemount 01984-0479-0001 Dataway Tap A
Rosemount 3051 CD3A22A2 Smart Digital Pressure Transmitter NEW
Rosemount 01984-0482-0001 Dataway Tap B VERY CLEAN
Rosemount 3051 CG3A22 Smart Digital Pressure Transmitter NEW
Rosemount 3051 CG4A02A1A 0-300 PSI Digital Pressure Transmitter NEW
Rosemount 3051 CD1A02A1AB2H2 Smart Pressure Transmitter NIB
Rosemount 3051SFP Digital Integral Orifice Flowmeter Pressure Transmitter NEW
Fisher Rosemount 1984-2137-0008 01 Processor 1 Meg Card
Fisher-Rosemount Systems 01984-2372-0003 Keyboard
Rosemount EMERSON PRESSURE TRANSMITTER 4/20MA 45VDC 1151GP4S22S1M1
Rosemount 3051 Smart Pressure Transmitter and Transducer - FF28
NEW ROSEMOUNT 3051C + 1199 REMOTE TRANSMITTER 3051CG4A22A1AS7B4K5M5 NIB $799
FISHER ROSEMOUNT Power Supply I/O 01984-1137-0001
Rosemount 3051 CD4A02A1BM5K7P1S5Q408 Pressure Transmitter 0305RC32B11B4 Manifold
Rosemount 644HAE7M5J5A1Q4K1125 SMART Temperature Transmitter
ROSEMOUNT 3051S PRESSURE TRANSMITTER #K
ROSEMOUNT Scalable Pressure Transmitter - BRAND NEW IN BOX - 3015S series
ROSEMOUNT Scalable Pressure Transmitter - 3015S-2TA1A2E11A1B-K7M5Q4T1 - 3015S
ROSEMOUNT 3051 3051S1TG3A2A11A1BB4E7M5Q8A0135 0-1500 kPag Pressure Transmitter
EMERSON FISHER ROSEMOUNT CL6784X-A1 RQAUS1
EMERSON FISHER ROSEMOUNT 1153DB5RA RQAUS1
NEW ROSEMOUNT 2088 G0A22A1I7 Ex rated Pressure Transmitter
ROSEMOUNT SCL-C-002-M2 WATER QUALITY ANALYZER *NEW IN BOX*
ROSEMOUNT PRESSURE TRANSDUCER 846-DS1J1 *NEW NO BOX*
EMERSON ROSEMOUNT ANALYTICAL 54EC-02 RQANS2
EMERSON FISHER ROSEMOUNT 2088-G2A22A184 RQANS1
EMERSON FISHER ROSEMOUNT 1151-DP4S22-B1 RQAUS1
EMERSON FISHER ROSEMOUNT 2088-G2S22A1B4 RQAUS1
EMERSON FISHER ROSEMOUNT 2088-G4A2BA1P2 RQAUS1
EMERSON FISHER ROSEMOUNT 1151DP3E12W3 RQAUS1
Fisher Rosemount 41B0985X02R Power Supply DM6001X1
EMERSON FISHER ROSEMOUNT 3051-TG1A2B21AB4E5 RQAUS1
ROSEMOUNT 3051CG1 PRESSURE TRANSMITTER 3051CG1, ITEM 881.
ROSEMOUNT 3244MV1E5B4M5 TEMPERATURE TRANSMITTER *NEW NO BOX*
ROSEMOUNT 228-02-21-56-61 TOROIDAL CONDUCTIVITY SENSOR *NEW NO BOX*
EMERSON FISHER ROSEMOUNT 42B0391X032 RQAUS1
Rosemount pressure transmitter 3051
Rosemount 8705TSA030S1W1N5G1 3" (80 mm) Magnetic Flowtube, Flanged Sensor
EMERSON FISHER ROSEMOUNT DM6371X1 RQAUS1
EMERSON ROSEMOUNT ANALYTICAL 4102AM-1NR RQAUS1
EMERSON FISHER ROSEMOUNT 54EC-01 RQAUS1
EMERSON FISHER ROSEMOUNT CL6776X1-A1 RQAUS1
Rosemount Pressure Transmitter 3051 L2AG0XD11AAF1M5C6 1 Year Warranty
Honeywell CC-TDIL01 Digital Input 24V Module 51308386-175 Rev C Rosemount PLC
Honeywell CC-TDIL01 Digital Input 24V Module 51308386-175 Rev C1 Rosemount PLC
ROSEMOUNT 01984-4068-0006 MULTI-PURPOSE CONTROLLER II
Rosemount Vortex 8800 CF0055A1N1D1E5M5P2 1/2" 316L SS Flowmeter 275PSI
ROSEMOUNT 0444MV2D3A2E5 TEMPERATURE TRANSMITTER **
ROSEMOUNT 444RL3U1A1EA TEMPERATURE TRANSMITTER **
NEW Rosemount Emerson 3051C*6672678 Pressure Transmitter with Remote Seal 118258
ROSEMOUNT 3051TG1A2B21AK5M561 **
Fisher Rosemount KJ3003X1-BA1 DeltaV Serial Module 12P0914X072 NEW G4 (2023)
ROSEMOUNT 3051CG4A02A1AM581C6H2 PRESSURE TRANSMITTER *NEW NO BOX*
Rosemount Smart 1151 Pressure Transmitter 1151DP4S12B1 60 day warranty - nib
Fisher-Rosemount CL6921X1-A7 Weight Scale FW w 11B7623X042 Chip P1.3 41B5228X202
EMERSON FISHER ROSEMOUNT 1151LT4SC0A22D RQAUS1
EMERSON FISHER ROSEMOUNT 225-07-56 RQANS2
EMERSON FISHER ROSEMOUNT 3051CG4A22A1AS1 RQANS2
EMERSON ROSEMOUNT ANALYTICAL 1056-01-22-32-000
Fisher Rosemount Provox Dual CIA Card Model # CL7652X1-A2 Part# 41B1841X012
Fisher Rosemount Provox VIO Ext I/F Model # CL6921X1-A1 Part# 41B5221X072
Fisher Rosemount Provox Weigh Scale FW Model # CL6921X1-A9 Part# 41B5228X312
ROSEMOUNT MC PEERWAY, PRINTED CIRCUIT BOARD, 01984-1045-0003, REV N/L
Rosemount FPA010C1G1B3-9801-19410-1-1 8732CT12M4 Transmitter W/1" ID Flow Tube
ROSEMOUNT 0-400°F ELECTRONIC CONTROL TEMPERATURE TRANSMITTER 592E1-TC41-P7-C7A
ROSEMOUNT VORTEX FOUNDATION FIELDBUS KIT 08800-5120-3003 NEW
New Rosemount 8711ASA15FU1N0 Magnetic Flowtube Sensor
Rosemount Analytical 228-02-21-56-61 Toroidal Conductivity Sensor 3/4-in MNPT
ROSEMOUNT TEMPERATURE TRANSMITTER 3144PD1A1E5M5X1Q4 NEW IN BOX
Rosemount 1151GP6E12M1B1 Pressure Transmitter
DeltaV / Fisher Rosemount KJ1501X1-BB1 System Passthrough Power Supply 12/12VDC
Fisher-Rosemount Delta V KJ4001X1-BA2 2 Wide Carrier KJ4001X1BA2 NIB SAR
Rosemount Emerson 1056 Dual-Input Intelligent Analyzer 1056-03-20-38-AN
Rosemount 8732CT12N0 Magnetic Flowtube Transmitter Smart Family Hart BCK
Rosemount 300S1AAE5M5 Pressure Transmitter
ROSEMOUNT RACK DISCRETE FLEXTERM 01984-2576-0001 0198425760001 01984-2575-0001
ROSEMOUNT 3051CG2 HART PRESSURE TRANSMITTER 3051 CG2, ITEM 495 *
ROSEMOUNT 3311 TRANSDUCER I/P (SAME AS 846) 3311DM1 ITEM 039.
FISHER ROSEMOUNT 49A1166 PID WITH COMPUTING MULTI-LAYER
ROSEMOUNT OXYGEN SENSOR PROBE WC3000-E, Brand New In Box
EMERSON Rosemount 03031-0761-0032 Pressure Transmitter
ROSEMOUNT 3051CG5 PRESSURE TRANSMITTER 3051 CG5, ITEM 051.
ROSEMOUNT 644HANAF6J6M5XA w/ 0068N11N00N045X3 *NEW IN BOX*
Emerson / Rosemount 4600G42E09 A5AD1 T1Q4 1600 PSI Best Offers Considered!
ROSEMOUNT 3051CG2 HART PRESSURE TRANSMITTER 3051 CG2, ITEM 458 *
ROSEMOUNT 3144PD1A1 HART TEMPERATURE TRANSMITTER, ITEM 801*.
FISHER ROSEMOUNT 8800DR105 Stainless 316 Vortex flow meter W transmitter 1"-300
FISHER-ROSEMOUNT TYPE CL6787 DISCRETE INPUT/OUTPUT TERMINATION PANEL
New Rosemount SMART TEMPERATURE TRANSMITTER 3144P
FISHER-ROSEMOUNT 12P0550X142,VE4001S2T2, KJ3001X1-B *NIB* DELTA V EMERSON (1B5)
EMERSON FISHER ROSEMOUNT 1151LT5EAOA22DM1 RQAUS1
EMERSON FISHER ROSEMOUNT 1151-GP6E12-B1 RQAUS1
Rosemount 3051 CD2A021LBSSK8Q4 Pressure Transmitter W/Manifold Max.W.P.-250 Bar
Rosemount Vortex 8800 Flowmeter
ROSEMOUNT 3051CA0 HART PRESSURE TRANSMITTER 3051 CA0, Item 195.
EMERSON FISHER ROSEMOUNT 12687-01 RQANS1
EMERSON FISHER ROSEMOUNT 01984-2576-0001 RQAUS1
EMERSON FISHER ROSEMOUNT 01984-2576-0001 (A/REV A) RQAUS1
EMERSON FISHER ROSEMOUNT 1151DP4E12 RQAUS1
EMERSON FISHER ROSEMOUNT 1151DP4E12 (REV M) RQAUS1
EMERSON FISHER ROSEMOUNT 1151DP4E12 (REV BE) RQAUS1
EMERSON FISHER ROSEMOUNT 1151DP4E12 (REV B8) RQAUS1
Fisher Rosemount Controller M5 Plus VE3004 KJ2002X1-CA1 Delta V Emerson NEW
EMERSON ROSEMOUNT ANALYTICAL 8711THE020R1N0 RQAUS1
EMERSON FISHER ROSEMOUNT 12P0680X082 RQANS1
ROSEMOUNT 3051CG4 PRESSURE TRANSMITTER 3051 CG4, ITEM 665 *
Rosemount Model 1056 Dual Input Analyzer
EMERSON FISHER ROSEMOUNT CL7651X1-A4 RQAUS1
EMERSON FISHER ROSEMOUNT 1181-C RQAUS1
EMERSON FISHER ROSEMOUNT E1151 RQAUS1
Rosemount 1151 GP5S22B1M4D2D Gage Pressure Transmitter
EMERSON FISHER ROSEMOUNT 92L13020 RQAUS1
EMERSON FISHER ROSEMOUNT 1054BT RQANS1
Rosemount G2S22A1 2088 Pressure Transmitter 0 To 75 PSI - New No Box
ROSEMOUNT 3051TG1A2B21AK5M5 **
EMERSON FISHER ROSEMOUNT 2088A1S22A1B4E5Q4 RQAUS1
EMERSON FISHER ROSEMOUNT 54EA-01-09 RQAUS1
EMERSON FISHER ROSEMOUNT DM6351 RQAUS1
EMERSON FISHER ROSEMOUNT E1151LT4S22 RQAUS1
EMERSON FISHER ROSEMOUNT E1151LT6S22 RQAUS1
EMERSON FISHER ROSEMOUNT FSCL7014-A1 RQAUS1
ROSEMOUNT MODEL 644RI1 TEMPERATURE TRANSMITTER *NEW IN BOX*
ROSEMOUNT 3051CD2A22A1AE5B4M5 **
EMERSON FISHER ROSEMOUNT 630-BIG-JOE RQANS2
ROSEMOUNT 1151DP5S22 SMART TRANSMITTER 1151-0011-0052 *NEW NO BOX*
Rosemount Conductivity Analyzer Controller 54E 54EC-01 Panel Mount *NEW*
Fischer Rosemount 10P59150002 2 In 1 Out Card Assembly
Rosemount 3051CG5A Gauge Pressure Transmitter 3051CG5A22A1BS7M5B4K7P1Q4Q8A9398
Rosemount 3051CG4A Gauge Pressure Transmitter 3051CG4A22A1BS7M5B4K7P1Q4Q8A9398
Rosemount 3051CG3A Gauge Pressure Transmitter 3051CG3A22A1BS7M5B4K7P1Q4Q8A9398
Rosemount 3051CD4A Differential Pressure Transmitter 3051CD4A22A1BS8M5B4K7P1Q4Q8
ROSEMOUNT 3051 TG3A2B21BE7M5Q4Q8S5 Pressure Transmitter 0-5516 kPa
ROSEMOUNT 3051 TG3A2B21BK7M5T1Q4S5 Pressure Transmitter 0-5000 kPa
Rosemount 8712HR12N0M4 Transmitter ! WOW !
EMERSON FISHER ROSEMOUNT DC6450X1-HA5 RQAUS1
ROSEMOUNT 3144D1E HART TEMPERATURE TRANSMITTER 3144 D1E, ITEM 510-514, 881.
FISHER ROSEMOUNT CL6922X1-B1 TERM PANEL 44B2852X012-6
Fisher Rosemount RS3 System Contact Marshalling Panel 01984-2459-(0006)&(0007)
NEW SCLP4J14M2 FISHER ROSEMOUNT SCL-C-002-M2 WATER ANALYZER 120V SHIPSAMEDAY
Fisher Rosemount CL6922 IDI CL6922X1-B1 - - 60 day warranty
Fisher Rosemount KJ3242X1-BA1 Delta V Series 2 Fieldbus Module Rev. F
ROSEMOUNT 3144 PD1 HART TEMPERATURE TRANSMITTER 3144PD1, ITEM 934.
Rosemount Model 3051CD1A22A1AA2001B4 SMART Transmitter NEW!
ROSEMOUNT 3144 PD1 HART TEMPERATURE TRANSMITTER 3144PD1, ITEM 095*.
Fisher Rosemount KJ2003X1-BA2 DeltaV Rev F Controller MD E7 (2023)
Fisher Rosemount CL6824X1-A2 Provox Smart Device Analog Input Card Rev. B
Fisher Rosemount CL6923X1-A1 Provox Intelligent Device Interface Rev. F
Fisher Rosemount CL6923X1-JA2 Provox Intelligent Device Interface Rev. B P1.2.2
4" 150# SS Flanged SMAR Pressure Transmitter LD 291 LD291 4-20 mA
EMERSON FISHER ROSEMOUNT R1151-GP5S22I1B1 RQAUS1
EMERSON ROSEMOUNT ANALYTICAL PBR15S020HA2S0C0000MP2CO1A1AK53K1Q40 RQAUS1
EMERSON ROSEMOUNT ANALYTICAL 1151DR2F12 RQAUS1
EMERSON ROSEMOUNT ANALYTICAL 1055-01-10-S1-DM RQAUS1
ROSEMOUNT SNUBBER DIFFUSION ASSY 4843B37G01, NEW IN BOX
ROSEMOUNT 3051CG3A22A1BB4P1Q4SA PRESSURE TRANSMITTER **
Fisher Rosemount CL6824X1-A2 Provox Smart Device Analog Input Card Rev. A
Fisher Rosemount CL6824X1-A6 Provox Smart Device Analog Input Card Rev. C
Fisher Rosemount KJ3242X1-BA1 Delta V Series 2 Fieldbus Module Rev. E
ROSEMOUNT 3144D1E HART TEMPERATURE TRANSMITTER 3144 D1E, ITEM 896, 897.
EMERSON FISHER ROSEMOUNT E1151GP5S22 RQANS2
EMERSON FISHER ROSEMOUNT E1151GP6E12 RQANS2
EMERSON FISHER ROSEMOUNT 04000-0070 RQANS2
EMERSON FISHER ROSEMOUNT SCL-P-014-M2 RQAUS1
EMERSON ROSEMOUNT ANALYTICAL MA13A0011AA00NABS5 RQAUS1
ROSEMOUNT 3051CA22A1AB4, 0-30 Pisa, New In Box
EMERSON FISHER ROSEMOUNT TL113 RQAUS1
EMERSON FISHER ROSEMOUNT TL175 RQAUS1
rosemount 1151ap6e22b2 pressure transmitter 0-100 psi 3/8" NPT Set for 0-3.5psig
Emerson 3051TG2A2B21AB4K7M5 Rosemount DP Transmitter -14.7 to 150 PSI - New S...
(N3-3) 1 NEW FISHER ROSEMOUNT 41B5222X33R ANALOG CARD
1PC ROSEMOUNT 3051TA1A2B21AB4M5Q4Q8 New In Box
EMERSON FISHER ROSEMOUNT 8732CT12M4N0 RQANS1
EMERSON FISHER ROSEMOUNT DM6363X1-A2 RQAUS1
EMERSON FISHER ROSEMOUNT 3311SS1A1B1 RQANS1