一套完整的PLC程序，并不仅仅是使系统能够运行起来这么简单，它也需要完整的注释、精良的架构、良好的可扩展性、完备的报警保护系统、运行前的模拟系统。下面就以STEP7的经验和大家分享一下。
一、完整的注释
在自动化领域，控制设备的竞争激烈程度，大家有目共睹，各个大鱼小虾，拼命的宣传自己的产品。可大家忘了，程序也是自己的产品，而作为一件有产品属性的程序，怎么可能不穿衣服，就光秃秃的骑马上阵呢？
程序的注释，起码应该有以下三个方面（STEP7为例）：
1、系统注释：整套程序的版权公司和此套程序用途
2、程序块注释：此程序块的主要用途和作者
3、段注释：此段代码的用途
4、变量注释：重要性不再多言
而至于保密性的考虑，我觉得应该再程序的加密算法或者块的加密上考虑，而不应该用减少注释这种小聪明来实现。
二、精良的架构
PLC程序无论控制的是一个设备或者是以一套系统，在程序编写之前都应该按照功能或者区域设计好整个PLC程序系统的结构，尤其是几个人共用一套PLC系统的时候，一般来说结构应包括以下部分：
1、公共组织程序区：OB1、OB35、OB81....等（STEP7）
2、设备功能程序区：一些现成的可以多次调用的程序块，如单向电机、双向电机、模拟量转换
3、公共程序区：通讯功能、模拟量采集、数字量采集
4、功能区：如液压站功能区、入炉辊道功能区、出炉辊道功能区
5、报警功能区：根据需要或者在各个功能区后面，或者单独独立出来
6、数据块区：根据功能，划分成有规律的数据区
一个良好的结构，可以使人很容易看明白整套程序，具备良好的可读性
三、良好的扩展性
许多程序可能在进现场之前都已经编好，但是到了现场，可能还需要添加另外的程序，为了避免打乱整套系统的结构，我们需要在每个功能区预留一定的空间作为备用。
四、完备的报警保护系统
我们的PLC系统往往用于工业环境中，每一次的事故都会造成或大或小的损失，为了做到事故预处理或者在事故中将损失降到*小，我们必须重视PLC的报警和保护，在此将其摘出来作为系统的一个重要组成部分。
五、PLC程序模拟系统
为了保证现场的调试进度或者给客户展示，我们往往在进现场之前，要对自己的程序进行全自动的模拟。为此我们需要在程序中加入模拟程序部分，模拟程序部分在正常现场运行之后断开。为了使程序具备模拟功能，需要做以下工作：
1、将实际的PLC I/O点转换为PLC的中间变量或者数据块变量
2、根据工艺要求编写各个设备的模拟程序
*全新原装正品，现货直供！所有备件的质保期均为1年，经过专业测试认证。订购咨询热线：18105962758
*如果您需要订购产品超过1件，请与我们联系，我们可以为您提供折扣。
*我们仅采用快递方式递送备件。（顺丰）
*如果您发现其他供货商为相同产品提供更为低廉的价格，我们也愿意参照其价格向您提供进一步的折扣。如果还有其他任何问题，请随时与我们联系。
*请让我们知道您有任何，备品，备件的需要，我们可以给您进一步的援助，我们等候您的咨询。
诚信经营，质量为首，诚信至上，鼎晟达竭诚为您服务
***************漳州鼎晟达自动化设备有限公司***************
联系人：林朝艺（销售经理）
手机 ：18105962758
QQ ：2880842795
邮箱 ：2880842795@qq.com
传真 ：0596-3119658（请备注林工收）
【主营产品】
1：Invensys Foxboro（福克斯波罗）：I/A Series系统，FBM（现场输入/输出模块）顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。
2：Invensys Triconex: 冗余容错控制系统、基于三重模件冗余（TMR）结构的*现代化的容错控制器。
3：Westinghouse（西屋）： OVATION系统、WDPF系统、WEStation系统备件。
4：Rockwell Allen-Bradley: Reliance瑞恩、SLC500/1747/1746、MicroLogix/1761/1763/1762/1766/1764、
CompactLogix/1769/1768、Logix5000/1756/1789/1794/1760/1788、PLC-5/1771/1785等。
5：Schneider Modicon（施耐德莫迪康）：Quantum 140系列处理器、控制卡、电源模块等。
6：ABB：工业机器人备件DSQC系列、Bailey INFI 90等。
7：Siemens(西门子)：Siemens MOORE， Siemens Simatic C1，Siemens数控系统等。
8：Motorola（摩托罗拉）：MVME 162、MVME 167、MVME1772、MVME177等系列。
9：XYCOM：I/O 、VME板和处理器等。
10：GE FANUC(GE发那科)：模块、卡件、驱动器等各类备件。
11：Yaskawa（安川）：伺服控制器、伺服马达、伺服驱动器。
12：Bosch Rexroth（博世力士乐）：Indramat，I/O模块,PLC控制器,驱动模块等。
13：Woodward（伍德沃德）：SPC阀位控制器、PEAK150数字控制器。
14:工业机器人系统备件。
15： 英维斯(TRICONEX):TRICON DCS的系列，如：3805E
另外还有 雅马哈(YAMAHA), 贝加莱(B&R)， 欧姆龙(OMRON), KEBA， 安川(YASKAWA) 等品牌的停产备件。
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RELIANCE ELECTRIC 57412-2A 57412-2 FIELD REGULATOR MODULE
BAILEY FIELD BUS SLAVE IMFBS01 **
RELIANCE ELECTRIC 911FK0041 FIELD CURRENT REGULATOR KIT *NEW IN A BOX*
NEW Sick CMF400-2101 Field bus gateway for DeviceNet
FOXBORO 65FS-FDJB-D FIELD MOUNT FLOW GAUGE *NEW IN BOX*
GE 193X532AB G01/G02 UNIVERSAL FIT VALUTROL DC SCR SPINDLE FIELD CONTROLLER
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor 0072
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor 0015
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor 0020
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor 0032
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor MFD 0112
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor MFD 0113
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor MFD 1262
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor MFD 6283
SEW Eurodrive MFD22a/Z36F/AF1 Field Distributor MFD 8601
SEW Eurodrive MFD22A/Z36F/AF1 Field Distributor FBE 395
SEW Eurodrive MFD22A/Z36F/AF1 Field Distributor FBE 575
SEW Eurodrive MFD22A/Z36F/AF1 Field Distributor FBE 94
SEW Eurodriver MFD22A/Z36F/AF1 Feldverteiler Field Distributor Unit DeviceNet
NEW RELIANCE ELECTRIC 911FK0041 FLEXPAK 3000 4 AMP FIELD CURRENT REGULATOR KIT
FIELD INC. QC02-UP4SA VALVE ACTUATOR *NEW NO BOX*
RELIANCE ELECTRIC DISTRIBUTED SYSTEM FIELD POWER MODULE 803456-3T
BAILEY FIELD POWER SUPPLY INFI90 IEPAF01 103317
SIEMENS 6RA8-261-3B/6RA82-61-3B/6RA8261-3B/6RA82613B FIELD SUPPLY ***XLNT***
ABB Bailey infi90 IEPAF01 AC-Field-Power-Supply - -
RELIANCE ELECTRIC SFRA FIELD CONTROL CARD MODULE J-842-S102 41572 0-41572-0
Siemens Field Supply Unit 6 RA 8261-3B _ 6RA82613B _ C89043-A1087-L1
ADVANCED ILLUMINATION RL4260 LED 4" INSPECTION BRIGHT FIELD RINGLIGHT NIB!!
Bailey IMFBS01 infi-90 Field Bus Slave Module Assy 6638005B1 ABB Symphony
Bailey IMFBS01 infi-90 Field Bus Slave Module Assy 6638005F1 ABB Symphony Board
NIB KRONE 6636 1 210-00 6636121000 160-PAIR FIELD ASSEMBLY KIT 6036 6630 6639
PepperL+Fuchs, KFDX-TC, 093174, Thermocouple Input Field Configurable Isolator N
Banner T30AW3FF200Q1 Photo Photoelectric Fixed Field Sensor 33430 Lot of 4 New
NEW ROSEMOUNT 01984-1288-0001 CONTACT FIELD TERMINATION BOARD REV. D/F
Cutler Hammer D520FM1 Field Terminal Assembly New
Reliance Electric 57412-2A Modified Field Regulator Automax
NEW YALE 509013819 FIELD COIL PACKAGE 101089
[National Instruments] FP-1601 + Base Ethrenet Network Field Point LabView
National Instruments Compact Field Point 8-Slot Backplane -- cFP-BP-8 --
RELIANCE ELECTRIC CNR-911FK0041 FLEXPAK 3000 FIELD CURRENT REGULATOR KIT 4A DC
Dresser-Rand FRM III Field Monitor, 129D400G01
00265 Horner Electric HE670IBU100 FIELD CONTROL INTERBUS S BUS INTERFACE UNIT Re
00267 Horner Electric HE693IBS100 FIELD CONTROL INTERBUS S BUS INTERFACE UNIT
Pepperl+Fuchs RD0-FB-EX4 Fisco/Entity Field Barrier, 204715-0011
Electro Flyte 12M02-00018-01 Field Control Board Card Rev. A Interface Regulator
L&J Engineering Field Interface MCG3200 P/N 3200 *71452B *FREE SHIPPING*
StoneL 459004 Field Link
ALSTON CEGELEC 20X4368/10A FIELD CONTROLLER
SIEMENS FIELD INTERACE MODULE WITH MANUEL 505-7202 NIB
Measurement Technology System and Field Power Supply 8913-PS-AC
ABB NAIO-02 EXTENSION FIELD OPTION KIT ANALOG MODULE REV B (3A1)
ABB Bailey DCS IMFBS01 FIELD BUS SLAVE MODULE NET 90 INFI 90 IMFBS-01
National Instruments Field Point FP-AO-200 8 Ch. Current Output 4-20mA Lot Of 2
Unico # 303-098 : Controls : Field Power Supply
Sew Eurodrive Field Distributor MFD22A/236F/AF1
GE Programmable Logic Card Remote Motor Field Board 531X152IOCAAG1 Stock Surplus
Bailey ABB IPFLD125 Field Power Module
World Electronics GFC-IIA Generator Field Control Reg
NEW ACTION ULTRA SLIMPAK? G448-0002 Bridge Input Field Conf Isolator G4480002V1
Okuma 1911-1840, Field net card
SMARTEYE SP1002/02 REVISION B , FIELD INTERFACE CIRCUIT BOARD
RELIANCE/ INTERPHASE FIELD POWER MODULE 0-57300
ELECTRIC MACHINERY 371C947G01 FIELD MONITOR II D522096
STONEL 459006 FIELD LINK
ELECTRIC MACHINERY 371C947G01 FIELD MONITOR II D522097
(NEW) MITSUBISHI QJ61BT11N Field network CC-Link Ver.2 compatible Mitsubishi PLC
INGERSOLL-RAND 42542845 FIELD ROTOR KIT *NEW IN A BOX*
RELIANCE ELECTRIC 0-51893-4 PC CONTROL BOARD FIELD CONTROLLER **
GE Field Terminal Module 5401-365
GE Field Terminal Module 5401-376
CONTRAVES A6358 FIELD SUPPLY BOARD REV. F, PC0808-01 REV. A
MONROE ELECTRONICS FIELD METER MODEL 171
NEW SEALED Banner Q60VR3LAF2000Q1 Adjustable-Field Photoelectric Sensor
RELIANCE 0-57300-B/057300-B/057300B/O-57300-B/57C300 FIELD POWER MODULE **NIB**
RELIANCE ELECTRIC FIELD REGULATOR O-57412-D
Pepperl+Fuchs RD0-FB-EX4 Fisco/Entity Field Barrier,186150-001,FieldConnex-92064
Horner Electric HE670IBU100N Bus Interface Unit For GE Fanuc Field Control New
ROSEMOUNT 0751AM3E5B FIELD SIGNAL INDICATOR 0-** INPUT 4-20MA ,BOXZH
WARNER ELECTRIC 5281-451-005 ROTOR FIELD *NEW NO BOX*
FREESHIPSAMEDAY RELIANCE FCCE 0-51893-4 CONTROL BOARD FIELD CONTROLLER 0518934
RELIANCE ELECTRIC 0-57412-D FIELD REGULATOR CARD MODULE
Telemecanique TSX-PSY-2600 Integrated Field Power Supply 26W 110-240V ! WOW !
(RR21-2) ALLEN-BRADLEY 1771-WHF F FIELD WIRING ARMS
BASLER ELECTRIC FIELD ISOLATION TRANSDUCER 9372900100
MODICON 50 SCREW TERMINAL MOTION MODULE FIELD WIRING BLOCK, 690-MCB-000-00 *NEW*
VIPA Pack of 10 Piece PN Steaker 180degree Field Plug 972 8PN00
Horner Electric HE670IBU100N Bus Interface Unit For GE Fanuc Field Control New
ROSEMOUNT FIELD SIGNAL INDICATOR 0751AM3NAB
Reliance 0-51893-3 Field Control PC Board ! NEW !
ABB YT204001-DK YXU 173A# FIELD GATE DRIVE BOARD TAKEOUT
DELTA TAU 603485-101 UNIVERSIAL FIELD BUS NETWORK ADAPTER CARD & COVER PLATES
FESTO CP-FB13-E PNUEMATIC FIELD BUS NODE Module With connector
A5E00379540 Siemens SIMATIC PG, SPARE PART ADAPTER MODULE F. FIELD PG M/M2
(Lot 23pcs) *NEW* Turck B8141-0/PG9 U6547 Field Wireable Female Straight Conn.
Field Networks for Increasing I/O Ports of PC, PLC & LP ARM-DO08N-4S
Festo Digital Fieldbus Field Bus Node CP-FB06-E CPFB06E 124860
1 RELCOM FCS-MB4-SG FIELD BUS MEGABLOCK 4 PORT W/SPURGUARDS***MAKE OFFER***
CMC Industrial mTB006 mTB006-6-EK2 Field Wiring Interconnect Enclosure
GE FANUC IC670MDL740K , FIELD CONTROL BUS INTERFACE UNIT, 24VDC #190705
Magnetek 46S03046-0010 Revision-1 Field Interface *NEW*
Banner Q60VR3LAF2000 Photoelectric Adjustable Field
Banner Q60BB6LAF2000Q Adjustable-Field Laser Class 2
LOT OF 33 ALLEN BRADLEY 1771-WH FIELD WIRING ARMS 21 TERMINALS TIN PLATED
Lansmont Field-to-Lab Saver 3L60 POWER COMMUNICATIONS DATA ACQUISITION OF SHOCKS
Rosemount Model 262 4-20 mA Transmitter Signal Loop Field Calibrator
ABB TAYLOR SC CONTROLLER FIELD BUS CPU 6229BZ10200B
Action Instruments DC Field Confiurable Isolator G408-0001
ALLEN BRADLEY FIELD SUPPLY KIT 1361-FS W/CIRCUIT BOARD 12M09-00012-00 *NEW SURPL
SMARTEYE SP1002/02 ELECTRONIC ASSEMBLY PCB FIELD INTERFACE PC BOARD
WHOLESALE LIQUIDATION OPTO 22 FIELD CONTROL BOARD WITH OUTPUT MODULES
World Electronics GFC-IIA Generator Field Control Reg
FESTO FIELD BUS NODE CP-FB13-E 174337 S907 P/N 89523 =PG01+S04-A020
ABB NAIO-02 EXTENSION FIELD OPTION KIT ANALOG MODULE (3A1)
NEW KRONE 66543350-21/2,60361102-00,6636121000 FIELD ASSEMBLY KIT 160-PAIR,BOXZS
CMC Industrial Electronics mTB006-6-EK2 Field Wiring Interconnect Enclosure Kit
CAREL PCO3000AS0 PLC Control Module with Service, Field and Serial Cards
TM5NS31 MODICON SERCOS III FIELD BUS INTERFACE MODULE
CMC Industrial Electronics mTB006-6-EK2 Field Wiring Interconnect Enclosure Kit
SMARTEYE FIELD INTERFACE BOARD PCB SP1002/02 REV. B
Compact Field Point CFP-2020 NI National Instruments
ALLEN BRADLEY 12M03-00193-01 , FIELD VOLTAGE CIRCUIT BOARD
NEW RELIANCE ELECTRIC 705385-65R FIELD KIT IMPAK PLUS
LOT OF 27 ALLEN BRADLEY 1771-WA FIELD WIRING ARMS, 1771WA SER. B
A5E00353527 Siemens SIMATIC PG, SPARE PART DC/DC CONVERTER F. FIELD PGM/M2
A5E00840034 Siemens SIMATIC PG, SPARE PART WIRELESS LAN MODULE FOR FIELD PG M
RELIANCE FIELD REGULATOR B/M 0-57412-1 107QC3 RN FREE SHIPPING
(L2) ALLEN BRADLEY 1771-WHF F FIELD WIRING ARMS
Ultra SlimPak G408-5004-S DC Input Field Configurable Isolator - New In Box
CMC Industrial Electronics HMC009 Field Interconnect Kit HazMon-In-A-Box
ONE NEW WARNER ELECTRIC Field and Bearing Assembly 5200-451-027
SIEMENS C98043-A1006-L PC FIELD REGULATOR DRIVE BOARD
LOT OF 25 ALLEN BRADLEY 1771-WA FIELD WIRING ARMS, 1771WA SER. B
RELCOM FCS-MB4-SG FIELD BUS MEGABLOCK 4 PORT W/SPURGUARDS
NEW FOXBORO PA109 FIELD MOUNTED PREAMPLIFIER
SMARTEYE SP1002/02 FIELD INTERFACE BOARD REV B ***XLNT***
8617-FT-NI Rev B Ver MT02 16 CH Field Terminal MTL
LOT OF 25 ALLEN BRADLEY 1771-WH FIELD WIRING ARMS 21 TERMINALS TIN PLATED
[National Instruments] FP-CTR-500 + Base 8 16bit counters Field Point LabView
Field I/O Digital FIOD-0016-R-B
National Instruments FP-PWM-520 Field Point 8 CH Output
INLAND MOTOR C-78684-1 FC1 FIELD CONTROL - FREE SHIPPING
ALLEN BRADLEY 12M03-00194-01 CONTROL BOARD SPEED/LAG/FIELD LOSS CONDITION
GRAHAM FIELD 59-3792GF X-RAY ILLUMINATOR **
Fincor 104625101 3130 Field Fuse PLC Circuit Board REV K from DC Drive 3132M
1771WHF, Field Wiring Arm, Allen - Bradley
BANNER World-Beam QS18 Adjustable Field Sensor QS18VP6LAFQ1 75510 NEW
[National Instruments] FP-CTR-500 + Base 8 16bit counters Field Point LabView
National Instruments FP-PWM-520 Field Point 8 CH Output
(V16) ALLEN-BRADLEY 1771-WHF F FIELD WIRING ARMS
HORNER ELECTRIC / GE Fanuc Interbus-s Field Processor Unit HE670IBU100
Allen Bradley 1771WF 1771 FIELD WIRING ARM W/18 SCREW TERMINATIONS
FIELD MODEL 804 Programmer
POLYSPEDE ELECTRICS E1522B-02 FIELD LOSS PCB BOARD 200/100VCD, E1522B02
Siemens Field Interface Module, # 505-7202, , Warranty
Reliance 0-51893-2 Field Controller ! WOW !
CMC Industrial Electronics mTB006-6-EK2 Field Wiring Interconnect Enclosure Kit
Banner QS30VR3FF200QPMA World-Beam Fixed Field 77385 NEW
Banner, Q60BB6AF2000Q, 63001, Adjustable Field Infrared Sensor NEW
New Actions Instruments T713-0000 Transpak ?Field Configurable Transmitter Box8B
Reliance Electric 0-51893-4 FCCE General Field Supply Box18B
ACCUTECH MULTI-INPUT FIELD UNIT SENSOR WI-AI NEW
POLYSPEDE ELECTRONICS E1539-001 FIELD SUPPLY BOARD E1539, E1539C
POLYSPEDE ELECTRONICS E1539-012 FIELD SUPPLY BOARD E1539, E1539C
258527C1 02A KIT, FIELD RETROFIT *NEW IN A BAG*
AUTOMATION SERVICES 100009 FIELD REGULAT **
GE Field Terminal Module 5401-672
FESTO CP-FB13-E FIELD BUS CONTROL MODULE
FRESH TAKEOUT FOXBORO FIELD BUS PROCESSOR MODULE P0400YE-0J (234-0)
Allen Bradley AB 12M03-00232-00 Field Supply Assembly Condition
Lot of GE Fanuc Field Control Qty 1 IC670MDL640J and Qty 2 IC670MDL331D
Johnson Controls FPC-101-601 Field Processing Controller
Murr Elektronik M8 Male Straight Field Wireable Connector 3-Pin Male (Lot of 10)
Galco 12M03-00117-03 Circuit Board Field firing assembly, REFLEX
NEW GE Fanuc Series 90-30 Field Upgrade Kit 44A731209-G03
NEW GE Fanuc Series 90-30 Field Upgrade Kit 44A731229-G03
EQUIMETER 046-2 FIELD REGULATOR
Festo CP-FB13-E Field Bus Controller ! WOW !
Two New Banner S18SP6FF100Q EZ Beam Fixed Field Sensor 30884
1 RELCOM FCS-MB8-SG FIELD BUS MEGABLOCK 8-PORT ***MAKE OFFER***
RELIANCE ELECTRIC 57412-E FIELD REGULATOR BOARD 802283-52 VT4000317
RELIANCE ELECTRIC FIELD REGULATOR 57412-E 57412 E 57412E
Festo Field Bus Connection Node CP-FB13-E
Johnson Controls FX-ZFR1811 Wireless Field Bus Router
BANNER PHOTOELECTRIC FIELD SENSOR Q60BB6AFV1000Q *NEW IN BOX*
Banner, S30AW3FF200Q1, 33364, Fixed Field Sensor NEW
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