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某些应用要求输入数据与预置数据值相比较。有时是单个数字与别的数字之间相比较，有时是一个数字与一个预置范围值相比较。
一个加热控制系统要求当前温度对照一个温度范围来校核，此范围规定了一个周围工作环境。本例将存储在D010中的温度值，由调温器THR1读出，与K19和K25作比较。这温度范围表示一个舒适的办工环境。做完比较，必须有一个结果，这个结果经比较得到3个主要状态，即>、=、<。这3个状态可用位标志表示，本例中使用了M20到M22。
所有情况中，当空气调节器为ON ( X000有效)，电扇会运行，即输出Y002为ON。这是因为所有的指示标志起动这个输出。当房间温度低于规定范围时，标志M20被激活，起动输出Y000，使加热设备HT1运行。如果房间太热，即实际房间温度超过规定范围，标志M22激活输出Y003，冷却器工作。
Ametek 80471SE Rev V
Fisher Scientific 03-692-164 FB
Rexroth B 830 303 440 I/U2-U/I
Fisher 2U224033272, 2" Linear
Measurex 05327605 GP60
Kone MAC Door Control Board 104 P-24783-003
Johnson Controls V47AB-6C, 3/4" Water 75-135F
Entek XM-122 gSE Vibration, 1440-VSE02-01RA, with XM-940
Fisher 26A6336X002
Fisher 28A8569X022 8" Seal Retainer
Allen-Bradley 1P0574B Z761
Avtron 630242 Rev B, A18295
STROMBERG ABB AI086-8/4, 57275812, ALLEN-BRADLEY 3100-AIO
Lorentzen & Wettre ABB 30004131, Ver 11, MSU-2
ABB YPH 105A, YT204001-DY/1
Berthold LB4710-080
ABB Stromberg SEPU 220VAC, 57287799, Allen-Bradley 3120-P2
ABB Stromberg DO86-16, 57275758, Allen-Bradley 3100-DO
Measurex 05357500, Rev A FSK
Fisher R3570X0H12 Repair Kit, Types 3570 & 3570R
Westinghouse HMCP, 150 amp Circuit Breaker, 600 VAC, 3 pole, HMCP150U4C
Johnson Controls V47AD-2C 1" Water Valve 115-180F
Simplex Expansion 566-074
Northern Elevator Field Brake Control FBB8707
ABB Stromberg SAFT 156 CPL, 57773740
Measurex 05345102, Rev F,
Homewood Products Corporation HPC 217A700G15
Secomam BP106 Pastel-UV
Allen-Bradley 1P0515B-Z752
ABB Stromberg Transducer SCGU 2Y1, 54315538 K
Gamma Instruments NN 926A NOR8600
Westinghouse 6630D61G02
ABB Stromberg SGHF 1000 AB Terminal Block, 57424699 J
ABB 57275847 USART86-INT Allen Bradley Stromberg 200042
ABB Stromberg FDC86-UNIT2, 57772182, Allen-Bradley 3250-FC1
FAG NU318E.M1.C3
Garlock Paperpak 4200 Packing, 41420-4064, 1" (25.4 mm)
FAG H2336 Bearing
Ronan X96N-SM Transmitter, C23434-1645
ABB SAFT 103 COM Control Board, 57777290
TB Woods 336014M85
Horton Clutch Repair Kit 994305
ABB Stromberg SAFT 157 CPT, 57773774
Data-Linc Group SRM6210E 902-928 MHz
Measurex 05363000 ECC
IRD 970 Accelerometer
Eaton Cutler-Hammer C800JNY2 Series CB1 Contactor, R53-03-012
Fisher Scientific Accumet 13-620-160
Cutler-Hammer KD-K Switch 400A, KD3400SKW, Style 8985A71G01
Data-Linc SRM6000
Martin Engineering CD36-390 Electric Vibrator, 330/575V, MVSI 3/200-S90
PepperL+Fuchs HART HPSM/32/TB-02
SATO WPC Plus Mini-LAN for Enchancement US, 11S000358
Foxboro P0917LY FPS400-24, Rev 0D
Fisher 28A8568X022 6" Seal
Flowserve X-201 XC3B2375X33-02 Mechanical Seal, 133022, 1.968"
Garlock Packmaster #6 41606-3048 3/4"
Garlock Packmaster #6 41606-3064 1"
Garlock Packmaster #6 41606-3058 7/8"
SKF 22322 EK Spherical
Safematic SFP-08-10 (NPT)
SKF 23122 CCK/C3W33
Dodge 005060 3-7/16
Measurex 05374100 Transistion Board GP63
Fisher 17A8172X022
Fisher 2N1309-02202
COEN PSDM-2000 Module, 2643-064-01
Johnson Controls V47AB-3C, 1/2" Valve 115-180F
Norgren F18-C00-M3DA 2" Filter
GEC Alstom MCGG22L1CD1003E
Foxboro P0972AJ-0L
Marsh BC-352 Printhead, 27699
ABbaseA QAPR 222 V Indicator, YL261001-PP
Honeywell FF-SPE44TXE
ABB SDT-VKB-2, 57294477
ABB Terminal Block DI/DO86-32CHF, 58172855 C
Allen-Bradley 592-A2NF Overload Relay, 96-300A
ABB YM321001-Z
Icon Research WiVib-2
Accu-sort XLT200 Rev 2A
Measurex 05353500, Host I/F, VPU
Flowserve Durametallic X-101 Seal, BM 133023, 2.750" Seal Dia, 2.362"
Entek XM-320, Allen-Bradley 1440-TPS02-01RB
Cutler-Hammer DTMV01 Digitrip MV, Style 3D86762
