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在可编程逻辑控制器系统设计时,首先应确定控制方案,下一步工作就是可编程逻辑控制器工程设计选型。工艺流程的特点和应用要求是设计选型的主要依据。可编程逻辑控制器及有关设备应是集成的、标准的,按照易于与工业控制系统形成一个整体,易于扩充其功能的原则选型所选用可编程逻辑控制器应是在相关工业领域有投运业绩、成熟可靠的系统,可编程逻辑控制器的系统硬件、软件配置及功能应与装置规模和控制要求相适应。熟悉可编程序控制器、功能表图及有关的编程语言有利于缩短编程时间,因此,工程设计选型和估算时,应详细分析工艺过程的特点、控制要求,明确控制任务和范围确定所需的操作和动作,然后根据控制要求,估算输入输出点数、所需存储器容量、确定可编程逻辑控制器的功能、外部设备特性等,**后选择有较高性能价格比的可编程逻辑控制器和设计相应的控制系统。
一、输入输出(I/O)点数的估算
I/O点数估算时应考虑适当的余量,通常根据统计的输入输出点数,再增加10%~20%的可扩展余量后,作为输入输出点数估算数据。实际订货时,还需根据制造厂商可编程逻辑控制器的产品特点,对输入输出点数进行圆整。
二、存储器容量的估算
存储器容量是可编程序控制器本身能提供的硬件存储单元大小,程序容量是存储器中用户应用项目使用的存储单元的大小,因此程序容量小于存储器容量。设计阶段,由于用户应用程序还未编制,因此,程序容量在设计阶段是未知的,需在程序调试之后才知道。为了设计选型时能对程序容量有一定估算,通常采用存储器容量的估算来替代。
存储器内存容量的估算没有固定的公式,许多文献资料中给出了不同公式,大体上都是按数字量I/O点数的10~15倍,加上模拟I/O点数的100倍,以此数为内存的总字数(16位为一个字),另外再按此数的25%考虑余量。
三、控制功能的选择
该选择包括运算功能、控制功能、通信功能、编程功能、诊断功能和处理速度等特性的选择。
1、运算功能
简单可编程逻辑控制器的运算功能包括逻辑运算、计时和计数功能;普通可编程逻辑控制器的运算功能还包括数据移位、比较等运算功能;较复杂运算功能有代数运算、数据传送等;大型可编程逻辑控制器中还有模拟量的PID运算和其他高级运算功能。随着开放系统的出现,在可编程逻辑控制器中都已具有通信功能,有些产品具有与下位机的通信,有些产品具有与同位机或上位机的通信,有些产品还具有与工厂或企业网进行数据通信的功能。设计选型时应从实际应用的要求出发,合理选用所需的运算功能。大多数应用场合,只需要逻辑运算和计时计数功能,有些应用需要数据传送和比较,当用于模拟量检测和控制时,才使用代数运算,数值转换和PID运算等。要显示数据时需要译码和编码等运算。
2、控制功能
控制功能包括PID控制运算、前馈补偿控制运算、比值控制运算等,应根据控制要求确定。可编程逻辑控制器主要用于顺序逻辑控制,因此,大多数场合常采用单回路或多回路控制器解决模拟量的控制,有时也采用专用的智能输入输出单元完成所需的控制功能,提高可编程逻辑控制器的处理速度和节省存储器容量。例如采用PID控制单元、高速计数器、带速度补偿的模拟单元、ASC码转换单元等。
3、通信功能
大中型可编程逻辑控制器系统应支持多种现场总线和标准通信协议(如TCP/IP),需要时应能与工厂管理网(TCP/IP)相连接。通信协议应符合ISO/IEEE通信标准,应是开放的通信网络。
可编程逻辑控制器系统的通信接口应包括串行和并行通信接口、RIO通信口、常用DCS接口等;大中型可编程逻辑控制器通信总线(含接口设备和电缆)应1:1冗余配置,通信总线应符合国际标准,通信距离应满足装置实际要求。
可编程逻辑控制器系统的通信网络中,上级的网络通信速率应大于1Mbps,通信负荷不大于60%。可编程逻辑控制器系统的通信网络主要形式有下列几种形式:
1)、PC为主站,多台同型号可编程逻辑控制器为从站,组成简易可编程逻辑控制器网络;
2)、1台可编程逻辑控制器为主站,其他同型号可编程逻辑控制器为从站,构成主从式可编程逻辑控制器网络;
3)、可编程逻辑控制器网络通过特定网络接口连接到大型DCS中作为DCS的子网;
4)、专用可编程逻辑控制器网络(各厂商的专用可编程逻辑控制器通信网络)。
为减轻CPU通信任务,根据网络组成的实际需要,应选择具有不同通信功能的(如点对点、现场总线、)通信处理器。
4、编程功能
离线编程方式:可编程逻辑控制器和编程器公用一个CPU,编程器在编程模式时,CPU只为编程器提供服务,不对现场设备进行控制。完成编程后,编程器切换到运行模式,CPU对现场设备进行控制,不能进行编程。离线编程方式可降低系统成本,但使用和调试不方便。在线编程方式:CPU和编程器有各自的CPU,主机CPU负责现场控制,并在一个扫描周期内与编程器进行数据交换,编程器把在线编制的程序或数据发送到主机,下一扫描周期,主机就根据新收到的程序运行。这种方式成本较高,但系统调试和操作方便,在大中型可编程逻辑控制器中常采用。
五种标准化编程语言:顺序功能图(SFC)、梯形图(LD)、功能模块图(FBD)三种图形化语言和语句表(IL)、结构文本(ST)两种文本语言。选用的编程语言应遵守其标准(IEC6113123),同时,还应支持多种语言编程形式,如C,Basic等,以满足特殊控制场合的控制要求。
5、诊断功能
可编程逻辑控制器的诊断功能包括硬件和软件的诊断。硬件诊断通过硬件的逻辑判断确定硬件的故障位置,软件诊断分内诊断和外诊断。通过软件对PLC内部的性能和功能进行诊断是内诊断,通过软件对可编程逻辑控制器的CPU与外部输入输出等部件信息交换功能进行诊断是外诊断。
可编程逻辑控制器的诊断功能的强弱,直接影响对操作和维护人员技术能力的要求,并影响平均维修时间。
6、处理速度
可编程逻辑控制器采用扫描方式工作。从实时性要求来看,处理速度应越快越好,如果信号持续时间小于扫描时间,则可编程逻辑控制器将扫描不到该信号,造成信号数据的丢失。
处理速度与用户程序的长度、CPU处理速度、软件质量等有关。可编程逻辑控制器接点的响应快、速度高,每条二进制指令执行时间约0.2~0.4Ls,因此能适应控制要求高、相应要求快的应用需要。扫描周期(处理器扫描周期)应满足:小型可编程逻辑控制器的扫描时间不大于0.5ms/K;大中型可编程逻辑控制器的扫描时间不大于0.2ms/K。
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Foxboro Invensys I/A Series P0912ZJ 6x8 Annunciator Keyboard Assembly. Rev-0A.
Foxboro Invensys I/A Series P0912SX Trackball Pointing Device
Foxboro Invensys I/A Series FCM100E P0972ZA Ethernet to Fieldbus Communication
FOXBORO INVENSYS FLAT PANEL 19" MonITOR MULTISYNC EA191M UNIX & WINDOWS 357erFLR
Foxboro Invensys DC/DC Converter D0130FG
Foxboro Invensys 875EC-A1C Electrodeless Conductivity Meter
Foxboro Invensys 875EC Intelligent Electrochemical Analyzer w/ 871FT Sensor NIB
Foxboro Invensys 51D AW51D WP51D AP51D Ultra 5 - Complete with Warranty
Foxboro Invensys 51D 360MHz AW51D WP51D AP51D Ultra 5 - Complete with Warranty
Foxboro Invensys 48 Series Magnetic Flow Transmitter Kit 48-BAA1A
Foxboro I/A Series P0961BD-0E Gateway Processor GW30B PLC PO961BD-OE invensys
Foxboro I/A Series P0961BD-0C Gateway Processor GW30B PLC PO961BD-OC invensys
Foxboro I/A SERIES INVENSYS MASS FLOWMETER CFT50-B1EA1BR-B
Foxboro FPS400-24 24VDC Power Supply w DIN Mount I/A Series P0917LY PLC Invensys
Foxboro FCM10E Communication 10Mbps Coax I/A Series PLC P0914YM FCM 10E Invensys
Foxboro FBM237 Channel Isolated 8 Output I/A Series PLC P0914XS FBM 237 Invensys
Foxboro FBM217 Group Isolated 32 Input I/A Series PLC P0914TR FBM 217 Invensys
Foxboro FBM211 Differential 16 Input I/A Series PLC P0914TN FBM 211 Invensys
Foxboro FBM207 Channel Isolated 16 Input I/A Series PLC P0914TD FBM 207 Invensys
Foxboro FBM202 8 Input, Thermocouple/mV I/A Series PLC P0926EQ FBM 202 Invensys
FOUR - Invensys 1290132-A24 24" Heavy Duty Refrigerant Hose 3/16 ID 5/16 OD
Eurotherm invensys Temperatur-Prozessregler 3504/CC/VH
Eurotherm Invensys Profibus Mini8 Mehrkanal-PID-Regler Mini8/8LP/0PRG/VL/PBUS9PI
Eurotherm Invensys Profibus Mini8 Mehrkanal-PID-Regler Mini8/8LP/0PRG/VL/PBUS9PI
Eurotherm Invensys Profibus Mini8 Mehrkanal-PID-Regler
EUROTHERM ConTROLS 3216/FM/VH/LRXX/R/XXX/G/ENG/ENG * IN BOX**
Erie VT3343G13B020 Invensys Pop Top Control Valve 110v Actuator Valve 3-Way
Erie Invensys VT2212G23T020 277V 50/60HZ 6.5W 2-Pos NO 1/2" SWT 2.5Cv AG23T020
Erie Invensys VT2212 2 Way Valve Body 1/2 Sweat in Box w/ instructions
Erie Invensys VS2343G14A020 - 3/4"
ERIE INVENSYS TA168-005 DIGITAL THERMOSTAT AUTO CHANGE OVER HEATING/COOLING
ERIE INVENSYS TA168-001 DIGITAL THERMOSTAT 24VAC WALL MOUNT
ERIE ConTROLS ACTUATOR AG13A020 * OUT OF BOX*
ELECTROLUX 0C1933 ANGLED DN10 SOLENOID VALVE 3/4" INLET 11.5mm OUTLET INVENSYS
ELECTROLUX 084986 4 HOUR 15 MIN FRIDGE COOLER DEFROST TIMER RZ-2001-21 INVENSYS
ELECTRO CORPORATION EMD1009CNV INVENSYS SENSOR
ECKARDT SRP981-BIDLSNA POSITIonER INVENSYS
ECKARDT SRD991-BFNS6FAANY-V01 INVENSYS 90 PSI 6 BAR SINGLE FOXCOM IT2 (W4)
Eckardt invensys IP24 IP - Signalumformer ungebraucht!
Eckardt Invensys Booster Relay LEXG-F VKX 403827075 In Box Free Ship
Eckardt Invensys BOOSTER RELAY FOR ACTUATOR * LEXG-F VKX 403827075 * no Box
Eckardt Invensys BOOSTER RELAY 4 ACTUATOR * LEXG-F VKX 403827075 ** no BOX**
Eaton Invensys Solenoid 198H04 S-30 K-63310-19 24 volt DC
EATON 120V 50/60HZ 10W INVENSYS SOLENOID VALVE K-63314-14
Double Like Break Thermostat by INVENSYS, 58130035000, 120Fahrenheit !87C!
DCM2400 Intergy Invensys Distribution Module 24-63A 1P
DAMPER ACTUATOR PISTON INVENSYS BARBER COLMAN M573-2520 PNEUMATIC 3-12 PSI
ConTINENTAL INVENSYS 5X20MM 12-280VAC 4-28VDC INTERFACE MODULE I.O.-OAC-R0-280
Cleveland Controls 2374-495 Air Sensing Switch Control Invensys RSS-495-1
CHALLENGER15LITE - GECMA - CHALLENGER 15 LITE INVENSYS FAST SHIPPING
CECILWARE#L022A, MARKET FORGE#10-4035,CURTIS#WC-810,INVENSYS Solinoid Valve Body
Carrier Parts - HN65BJ208 - Sensor Module - Robertshaw/Invensys MP33-2201
Carrier Parts - HK02UC375 - High Pressure Switch - Invensys AP21-1209 - C/O 375
Carrier Parts - HK02AC030 - Low Pressure Control - Invensys AP24-1085
Carrier Parts - HK02AB175 - Pressure Switch - Invensys AP21-1236 - C/O 175 PSI
Bunn Coffee Water Solenoid Invensys K-12930-S 319H06 120 Volt
Brook Hansen Brook Crompton Invensys W-DA90LT-D AC Motor 220-240V
BROOK CROMPTON INVENSYS HIGH EFFICIENY 25 HP MOTOR 2820214WA-G1 W-DA1180ME ~
BROOK CROMPTON INVENSYS 3PH 230/460V 1765RPM 40HP MOTOR W-DF324TC-NX 100007
BROOK CROMPTON INVENSYS 15HP MOTOR,RPM 1750, 575V,FR:W-DA254TC-R,SN:E952318,
Brook Compton Motor Invensys W-DA80MG-C 1/2 Hp Selfeeder Motor
Brook Compton Invensys W-DA215TC-R 10 HP 460 V 1750 RPM 3 Phase Motor WDA215TCR
BRAND / INVENSYS BARBER COLMAN EA57 120V 40W 0.65A 136` VALVE ACTUATOR UNIT
BARBER COLMAN/T.A.C/ INVENSYS MF-5513 24V HYDRAULIC VALVE ACTUATOR
BARBER COLMAN/T.A.C/ INVENSYS MF 5513-702 24V HYDRAULIC VALVE ACTUATOR
Barber Colman, Siebe, Invensys, TAC, Network 8000 GCM, GCMA 104 Keypad
BARBER COLMAN SIEBE INVENSYS TAC TC98-S SEVEN DAY PROGRAMMABLE THERMOSTAT _+
BARBER COLMAN SIEBE INVENSYS TAC TC98-M SEVEN DAY PROGRAMMABLE THERMOSTAT +
BARBER COLMAN SIEBE INVENSYS TAC NETWORK 8000 KEYPAD GCMA 104 GCM KEYPAD_
BARBER COLMAN SIEBE INVENSYS TAC NETWORK 8000 KEYPAD GCMA 104 GCM KEYPAD
BARBER COLMAN SIEBE INVENSYS TAC NETWORK 8000 GCM ECH-001 GCM ECH 1 _
Barber Colman Siebe Invensys MK-2690-0-0-2 Pneumatic Valve Actuator No Spring
Barber Colman Siebe Invensys MK-2690-0-0-2 Pneumatic Valve Actuator No Spring
BARBER COLMAN SIEBE INVENSYS GCMA-112-2-0-3 - CPU PCB ASD BUS FIRMWARE REV5.3 _
BARBER COLMAN SIEBE INVENSYS GCMA-112-0-0-3 GCM CPU PCB GCS BUS_
BARBER COLMAN SIEBE INVENSYS GCMA-112-0-0-2 - CPU PCB GCS BUS FIRMWARE REV5.4 _
BARBER COLMAN SIEBE INVENSYS GCMA-106-5 GCM SERIAL I/0 BOARD _
BARBER COLMAN INVENSYS-TEMP ConTROL A-60063-300
Barber Colman Invensys Temperature Controller 20-120*F Adjustable Ratio #CP-8102
BARBER COLMAN INVENSYS MACO EATON SOLENOID VALVE SERVICE KIT K-12930-246 702003
BARBER COLMAN INVENSYS MACO EATON SOLENOID VALVE SERVICE KIT K-12930-246 702001
Barber Colman invensys MA-405-0-0-3 120v actuator in ex proof enclosure
BARBER COLMAN ACTUATOR MP-5410 (TAC - SCHNEIDER ELECTRIC - INVENSYS SIEBE)
Barber Coleman Invensys Relay Module LCMA-105-0-0-1
Barber Coleman Invensys LCMA-121 Temperature Controller Circuit Board
Barber Coleman Invensys LCMA-110-0-0-2 Local Control Module Circuit Board
Barber Coleman Invensys GCMA-112-0-0-2 CPU BUS Circuit Board Card
ASCO REDHAT INVENSYS AL-195 SOLENOID AIR VALVE
ASCO REDHAT INVENSYS AL-193 SOLENOID AIR VALVE
ASCO REDHAT INVENSYS AL-192 SOLENOID AIR VALVE
APV INVENSYS SANITARY COMPRESSION TYPE VALVE SW43T40C1V5Z1NETTT, 18BP819982TTT
APV Invensys L772465 PT1847 Shaft Seal Kit Single Seal Fixing 2D 6 D-8
APV Invensys L772461 L773100 L773078 L773038 Lot
APV Invensys L772461 129461 Face Kit W + SiC/C/EPDM RTH91-25-S2CE1
APV Invensys 18AP819096 SWAPC720T20B1E3 Sanitary Compression Valve Shutoff
AK-42309-500 INVENSYS/BARBER COLMAN/SIEBE/TAC POSITIVE POSITIonING RELAY
AIM Historian V3.2 Software and documentation , Invensys I/A series info suite
Actuator Invensys MP-9710-103-0-2
Action Invensys Eurotherm Q468-0000 AC Input Module Isolator Free Shipping
Action Invensys Eurotherm Q468-0000 AC Input Module Isolator FREE SHIPPING
Action Instruments Invensys Eurotherm Q468-0000 AC Input Module Isolator
ACD36 Intergy Invensys Distribution Module 12-32A 2 Pole
A1171 - INVENSYS MP-465-0-2-2 ACTUATOR MOTOR REVERSIBLE & PROPORTIonAL 120V 28W
80026-02 INVENSYS SAFETRAN ONE TRACK CIRCUIT SURGE PANEL TRACK WALL MOUNT NOS
575 deg F Temperature Switch Auto Reset High Limit Invensys 275-3326-00 Hayward
5.5kw, 6.3kw, Brook Crompton Invensys Ac Motor, Type- Wdf132se
4.0kw, 4.6kw Brook Crompton Invensys Ac Motor, Type- W-da112ms G261337
3 CLEAN APV CREPACO 4 RI 0 587 S G984 F BIN CARD INVENSYS ENGINEERING
3 ACCOS 2S CARDS 2 ARE AS25 A29 ONE IS A AS25 A6 INVENSYS ENGINEERING
24V on/off heat or cool Invensys 31-103
2341-521 Receiver Controler HVAC Schneider-TAC-Invensys-Barber Colman
2" Invensys 122-12 Gas Pressure Regulator G15 (1749)
2 INVENSYS SPRING RETURN ACTUATORS MS41-7153 & MA41-7153 HVAC PARTS- FINAL SALE
16842 Old-Stock, Invensys W-DA80MG Motor 1.0HP
148528 Old-Stock, Invensys MG21-1633 Pressure Control Switch
12-2446-23 Scotsman CME500 Water Inlet Valve 120V 10W Invensys K-65994-10
1.5 HP BROOK HANSEN INVENSYS 3/60/575 HE TE 145T-K FR 1720 RPM NIB !!!!
1 INVENSYS TK-3201 PNEUMATIC BULB THERMOSTAT NIB *MAKE OFFER*
1 INVENSYS 043-B 1/2" GAS REGULATOR NNB *MAKE OFFER*
1 Invensys CP-8551-0-0-1 Pneumatic Transducer
* * INVENSYS DIGITAL SPEED SENSOR DI-MAG EC58424HV F2 ELECTRO
*** *** INVENSYS VB-7211-0-4-8 VALVE BODY 1" FULL PORT 2-WAY STEM UP OPEN
(5) PEM 1's BARBER COLMAN SIEBE INVENSYS TAC NETWORK 8000 PEM-1 -
(5) MN FLO3T BARBER COLMAN SIEBE INVENSYS TAC MNFLO 3T VAV ConTROLLER MN FLO _+
(4) MNSDK SIEBE, INVENSYS, TAC NETWORK 8000 MICRonET T-STAT SENSOR MN SDK +
(2) Invensys MK-12100 MK12100 Pneumatic Damper Actuator 3-8 PSI Spring 2" Stroke
(10) lot of ten Invensys EMST-101 GoodWatts Programmable Thermostat
#301 Invensys TK-1001-398-2 ?Pneumatic Room Thermostat
"NIB" INVENSYS TKR-1001 pneumatic thermostat kit