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每个可编程控制器有许多独有的特征。但是常常要问，指令真地最大限度地使用了吗?很常见地，当编写程序时，一种“习惯”开始出现，就很难改掉。基本上我们每个人总坚持我们所最了解的。
比较指令是最容易使用的指令之一。然而，当数据范围被要求检测时，好象是要引起恐慌，或者好象过于复杂的系统是当今的要求。区间比较很容易地用多个单值比较状态来完成，正如使用复杂的区间比较状态。这里给出的例子是一台售货机。
投入机器的钱数多少决定选择的是哪种饮料。钱的总数必须等于或超过所买商品的规定价格，一种简单的单值比较就足以解决这个问题。因此这里只关心当钱不等于或超过物品价时的情况。
本例中货品:
A, C, D和F价格为80美分;
E价格20美分;
B价格70美分。
Multilin DCS4-125 DC to DC
Measurex Video Memory 05359601 Rev B
FAG 7218B.MP Angular
SKF HM 48T Withdrawal Nut
Rexroth VT 2010 S49/2
Prosoft Radiolinx RLX-IH Wireless Transmitter with C19M10-40-002
Ronan X96N Adder/Subtractor CBAY-4804, B4803K
Printronix 110500-001
Measurex PIDP III Unitec Processor, 09437700
Allen-Bradley 1336-C003-EJD AC
Bofors Elektronik H-2-KG
Fisher 12A9144X012 8"
Elektrobit SYHA , 7600040183
Foxboro IDP10-DS1B01C-L1
Basler Electric BE1-851, G5A2S1U
Westinghouse WC201K5CE / WC201K5CA Size 5 Contactor, 766A196G05/766A196G01
Fisher 12A9122X012 Seal Ring 6", Type 8500
ASEA ABB RADSB RK 625 001-CC
Allen Bradley 151153 Drive Board, 151104
Sprecher+Schuh CEP7-M180-20 Overload Relay 57-180A
Measurex 08545000
Eaton Cutler-Hammer Style 371D392G01
Flowserve X-101 80mm, 133024 for APT-5
SKF 7220 BECBM Angular
Tylan General Mass , FC-260HPV, 500 SCCM
Garlock Packmaster 6 41606-2024 3/8"
Kone 133022G02, US518238
Clearpoint QED-F Rev FS, QED1
Bofors H-2-KN
Cutler-Hammer HMCP 600 amp , HMCP600Y6W, Style 663383G08
ABB Stromberg SAFRCA, 56018492
Power Measurement 3720 ACM Meter
Max Machinery 120-200
Measurex 05367600 ADC
Safematic SE2-1.969-QRMG-300411 for APT3
Omega PX410-100SI
Fusematic FPE 180B-124
Flowserve XRO-RA Double 4.750" Shaft Size, B/M 101433
Allen-Bradley 117509, Rev 02, 119475
Safematic MechanicalSeal SE2-AP-1.575-QRMG for Sulzer ATP2,305219
Foxboro IGP20-D20B21C-M2B1Z1T
IRD Mechanalysis Model 308 SP511
Measurex Transceiver, SSC F/O Auto B/C 05359100 Rev C
ABB YPI 103A, YT204001-AB
FAG N218E.TVP2
Parker 909303 74W
Allen-Bradley 1336S-CWF10-AN-FR with 1201-HA1
Fisher Valve Cage 2U215333272
Gates Powergrip GT2Belt 2590-14MGT-115,9207-0148
Power Measurement ION 7500, P7500A0C0B6A0A0A
Moyno Progressive RM520-CBNSTL, 4240213002, RFA2E6510
Markem-Imaje MP300 Cutter, ENR335200-00
12-72VDC Input Circuit Board 84C-0095-002
Foxboro P0700WB
Eaton Dynamatic 15-493-600
Divelbiss Bear BonesICM-IO-24 Expander,8 in / 8 out 7-32 VDC
SKF & Dormer Tools B112 No. 6 HSS MTS
FAG 23218-E1A-K-M
Thermo Electron Orion 900200 AgCl
Thermo Electron Orion 9416BN
Crydom CMA6090
Taylor Tool M60x2 Hand Tap
Leeson Electric Motor, C90T11FZ7C, frameD90S, 1hp, 1100 RPM, 575V 3ph
Safematic SE2-2.362-QRMG-305211
TB Woods 3500-14M-55
A.O. Smith SQ1052 Motor, 1/2hp, 115/230V, 3450 rpm, frame 48Y
Simplex 4100 Power Supply 637-163, 566-072
Foxboro P0961BC Control Processor CP40B,Rev 0K
Simplex 565-738
ABB Digital YPO 104A, YT204001-BF/1
Icon Research ICON9802
John Crane SafematicSTAF-2.6875-QRVG-1303051
Bussman JCL-A-12R Fuse, 230A, 2400V
Siemens Relcon R15-03-332, Keypad Display, R15A02A112B
ABB 57771682A Type MS86-C
ABB / Stromberg SAFT174 TBC, 58101346
ABB Stromberg DI86-32, 57275782, Allen-Bradley 3100-DI
Fischer Porter 10A3555A Flowmeter, 1.12USGPM H2O, 200 PSI
Greenfield M40x1.5 HS Tap GD 6, 6 Flute
SKF 23222 CCK/C3W33
Safe-T Seal STB2A-2.125-QRMG-1302827
FAG H3134.515
Fisher 12A9084X012
ABB SAFT 172 POW , 58094498
