501609
日期：2018-8-81 引言
在工业生产中有各种各样的控制问题，其解决程度直接关系到经济效益和管理水平。在发达国家由于综合自动化水平高，设备工艺先进，普遍采用了计算机控制与管理，生产与管理效益极高，产品质量好，成本低，可靠性高等，生产过程中人为影响因素几乎没有。在我国由于经济发展水平及历史的原因，尽管近来发展很快，但综合自动化程度还是较低，普遍停留在单机自动化水平，操作者与管理层之间的通信甚至还停留在用电话联系的水平，管理时效性差，管理层难于全面了解控制现场情况，因此大量的有用信息沉淀、流失，形成一个个“自动化孤岛”或“信息孤岛”，要发挥信息在工业自动化中的指导作用，其解决方案之一就是推广集散控制系统的应用，本文就有关问题作些讨论。
2 计算机控制系统
生产过程自动化控制主要有开关控制和调节控制，当前大多以计算机控制系统，也就是数字控制系统来实现，如图1所示，系统中包含有时间上离散、幅度上量化的数字信号e（k）和u（k）。计算机控制系统的特点是被控对象大部分为模拟信号，而计算机只能处理数字信号，因此两者之间必须执行a/d和d/a转换，以实现这两种信号之间的相互转换。如果忽略幅值上的量化效应，数字信号即为离散信号，因此，计算机控制系统若不考虑量化问题即为采样控制系统，如果将连续的控制对象连同保持器一起进行离散化，那么采样控制系统即简化为离散控制系统。
计算机控制系统又分为集中式监控系统与分布式控制系统。前者计算机可能并不直接参与控制，对被控对象不会产生直接的影响，主要任务是对大量被控参数和设备的状态进行巡回采样，数据记录、数据统计和整理、数据越限报警以及对大量数据进行积累和分析，属计算机监视系统，现场控制是通过人工来完成;如果计算机直接参与控制过程，称为计算机直接数字控制系统（ddc，direct digital control），是计算机的过程输入通过控制算法得到控制输出后，以计算机取代模拟调节器，直接通过接口控制执行机构，从而实施对现场被控过程的控制，使被调量保持在给定值，主要用于较小的回路控制，ddc系统由被控对象（生产过程）、检测仪表、执行装置和数字控制调节器组成，优点是因为计算机运算能力强，很容易实现串级控制、前馈控制等比较复杂的控制规律，其框图如图2所示。 咨询热线：18150695049
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漳州鼎晟达自动化设备有限公司
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FOXBORO
FOXBORO LCD METER WITH ANTENNA 753-9004-0002
FOXBORO 0-30PSI ELECTRONIC PRESSURE TRANSMITTER 841GM-B ST-A AS-Y
Foxboro Intelligent Pressure Transmitter 823MP-IM3TBSA-A w/ Diaphram Sensor
Vintage 1986 Aerosmith Done With Mirrors Tour T-Shirt Sullivan Stadium, Foxboro
FOXBORO SINGLE STATION MICRO MODULE ST.AE 760CSA-3A 105023
NEW FOXBORO P0121AM CAPSULE ASSEMBLY
FOXBORO ph/ORP CONDUCTIVITY SENSOR ST-A 871PH-3F1A
FOXBORO CURRENT VOLTAGE CONVERTER BOARD ST-A 2AI-H2V NO301PZ-F F8326G 105393
FOXBORO TRANSMITTER RTT10-A0FLS012
New Foxboro Pressure Transmitter 821gm-hk1nm1-am 150 PSI
FOXBORO SPEC 200 MANUAL STATION 235SK-V
FOXBORO PANEL MOUNT TOTALIZER 75TCA PDEA STA
FOXBORO CONTROL BOARD P0122BM
NEW FOXBORO 0-150F TEMPERATURE TRANSMITTER RTT20-I1LREFD-D2
GUARANTEED! FOXBORO ELECTRONIC TRANSMITTER 823DP-13S1NL2-B 823DP13S1NL2B
FOXBORO I/A SERIES INPUT/OUTPUT PLC P0400YE REV-ON
FOXBORO I/A SERIES INPUT MODULE REV-OR P0400DA FBM 1
FOXBORO I/A SERIES INPUT MODULE P0400DA-OK
FOXBORO 4" MAGNETIC FLOW TRANSMITTER 2804-KARA-OS 103971
Foxboro P0914XA P0914XA-0C 8 Slot Rack for I/A 200 Series SAR
NEW! FOXBORO PH-ORP MONITOR 2220-A01P-J 2220A01PJ 110 VAC 50/60 HZ
FOXBORO P0970BC DUAL NODEBUS INTERFACE DNBI REV-OC
NEW FOXBORO 50-150F TEMPERATURE TRANSMITTER RTT20-I1LQQFD-D2L3
FOXBORO M/2800 SERIES MAGNETIC FLOWTUBE 2801-SABA-THG-G ST. B
Foxboro Analytical Conductivity Sensor 871EC-EV3-A w/ Monitor 872 Industrial
FOXBORO PRESSURE TRANSMITTER IDP10-DF1C01F
Foxboro 230SE Spec 200 Station New Unit Controller in Original Box MMC
Foxboro 910-ED1 910ED1 Analytical Conductivity Cells Sensor SAR
Invensys Foxboro E20F operator interface touchscreen
Foxboro Conductivity Sensor 871EC-RE0-A 871EC-REO-A
FOXBORO 43AP STABILOG C0128AC PNEUMATIC CONTROL UNIT
Foxboro I/A Series IMT96 IMT96-SEADB10M-AB Flow Transmitter
FOXBORO CONDUCTIVITY / RESISTIVITY Cell Part No 920 - EE1
FOXBORO PEN MOTOR DRIVE CO131UL NEW
Foxboro B0134SV Thermocouple Amplifier 2B8044, 7 Wire
Foxboro Intelligent Transmitter 821GM-DS1SH2-M
Foxboro NO810ZN NO81OZN Microspec PWA Controller Communication DIG MUX and alarm
New in box FOXBORO 2AX-SSL 2AXSSL N0301KN J
FOXBORO V1SF3A5A00J CONTROL VALVE ****XLNT****
Foxboro Analytical Conductivity Sensor 871EC-EV3-A
Foxboro Temperature Sensor DB-21B-124 5S883w 10' Long Probe 3/4" npt & 10' Cord
#79 Foxboro Cable Assembly P0400SG Rev E FBM-10-15
#626 Foxboro DM400YL-0G I/A Series DM400YL FBM 10 Rev0G 120V Input Output Module
FOXBORO 3C8-C3D CNT/D CONVERTER IS REPAIRED 30 DAY WARRANTY
Foxboro Temperature Transmitter RTT20-D1SNQCA-C1K1L1M1
Foxboro 8000 Series Magnetic Flow Transmitter 8000-PA10-G
Foxboro Chart Drive Control -- NO302KA -- New
Foxboro pH/ORP Sensor 871PH-3F3A
FOXBORO D0140BD-B USPP D0140BDB
FOXBORO D0140KE-C USPP D0140KEC
Foxboro Pressure Transmitter IDP10-D20C01C
FOXBORO 2AI-C2L USPP 2AIC2L
FOXBORO 65FS-EDJB-C USPP 65FSEDJBC
FOXBORO B0133TA-B USPP B0133TAB
FOXBORO B0133TB-B USPP B0133TBB
Foxboro Thermowell W-PFS-A26-2-150RF 8"
Foxboro Thermowell W-PFT-A26-1.5-150RF-HAST-C, 10"
Foxboro Temperature Probe PR-13NSS-006
Foxboro Temperature Probe PR-14BBI-012
FOXBORO TEMPATURE TRANSMITTER RTT20-D1SNXFD-L3M1 105111
10 x Foxboro P0972WU 1000 base unplink module.
FOXBORO P0916KP-0B USPP P0916KP0B
FOXBORO NO311GA USPP NO311GA
FOXBORO E69R CURRENT TO AIR CONVERTER E69R-I2
FOXBORO 80MB HARD DRIVE WITH AP20 SOFTWARE P0901VK REV 0K
NEW FOXBORO D0140BG-B PCB CIRCUIT BOARD D507598
FOXBORO B0139C7 **NIB**
FOXBORO B0158MC NSPP B0158MC
FOXBORO P0912CC USPP P0912CC
Foxboro N1205NT Pressure Transmitter w/ Ametek part
FOXBORO PRESSUR PROBE SENSOR CO-NI **
FOXBORO 871A-3F-3 SERIES PH AND ORP SENSOR
FOXBORO P0400YE-OK
FOXBORO 235SK-V USPP 235SKV
FOXBORO 2AC USPP 2AC
FRESH TAKEOUT FOXBORO I/A P0400ZG REV 0M MODE BUS INTERFACE MODULE (131)
FOXBORO 2AX+DS1 *NEW NO BOX*
FOXBORO RTT20-T1SNJFA-L3 TEMPERATURE TRANSMITTER **
8000-PA15 Foxboro 8000PA15 Magnetic flow transmitter - 60 day warranty
NEW INVENSYS FOXBORO EVO 2014 Enterprise Models P90/91/92 & H90/91/92 Processors
FOXBORO D3008RQ A,D3008RQ,F7829E,D3001BN PCB BOARD ,BOXZS
new foxboro p0500ru i/a cable termination assebly fbm3a/33a 3 wire
Foxboro I/A Series P0972AJ-0J Fieldbus Isolator 10MB Ethernet PLC PO972AJ-OJ
Foxboro Magnetic Flow Transmitter 1/2" Model 1895 Teflon Liner
FOXBORO 2AP-A NSPP 2APA
Foxboro Temperature Transmitter E94 0-100C, tested, calibrated,1 year warranty
FOXBORO P0902ES USPP P0902ES
FOXBORO B0134ZX USPP B0134ZX
FOXBORO 0702075 USPP 0702075
NEW FOXBORO B1278HE 0.5-60PSI 250PSI 1/4IN NPT FILTER-REGULATOR D518327
FOXBORO PR-23UBS-006 USPP PR23UBS006
Foxboro Conductivity Sensor 1210TF-3-Z
Foxboro Converter Module 2AO-V3I
Foxboro PIO Isolator Cable P0800DC Rev M
Foxboro Booster Relay LEXG-G
Foxboro Manual Control Unit N0309ZV
Foxboro SPC/SL Module 2AX+FJ-M ST.A
Foxboro 2DC-K Analog Control Card *NICE*
NEW FOXBORO 2AX+INT-L PCB CIRCUIT BOARD D507914
FOXBORO P63140206281 USPP P63140206281
FOXBORO 120VAC 10.2W ELECTRODELESS CONDUCTIVITY ANALYZER 873EC-AIYFGZ
FOXBORO F0109AB-G F9023AG PCB CIRCUIT BOARD D507686
FOXBORO B1278HE USPP B1278HE
FOXBORO 43APFA4 20PSI-INPUT 0-75PSI PNEUMATIC CONTROLLER D492710
FOXBORO C0162BB-A 2B8518 PCB CIRCUIT BOARD D507676
NEW FOXBORO 2AX+RBF RELAY BUFFER STYLE B D507682
FOXBORO JORDAN AD8850 DRIVE PCB CIRCUIT BOARD D507770
FOXBORO 43AP-FA2 50-150 DEG F PNEUMATIC TEMPERATURE CONTROLLER D498589
FOXBORO 6410HF-0-PI PNEUMATIC CHART RECORDER MODULE 118V-AC CONTROLLER D497163
FOXBORO 124-FE PNEUMATIC SCANFOLD CHART RECORDER 115V-AC CONTROLLER D497164
(9120) Foxboro Card Signal Conditioner P0121KQ
FOXBORO 2AP-A PROCESSING MODULE *NEW IN A BOX*
FOXBORO 2AX+DS1 MEASUREMENT SIGNAL DISTRIBUTION MODULE 1-10 **
Foxboro 875CR-A2F-A Electrochemical Analyzer Intelligent 875CRA2FA Interface
FRESH TAKEOUT FOXBORO P0400YE-0K P0400YE I/O PROCESSOR MODULE (246-0)
FOXBORO PRESSURE TRANSMITTER GAUGE (1GP10-1201F
Foxboro P0916ZT-0B FBM211 PLC Module w DIN Mount Base P0916BT 0F FBM 211 PO916ZT
FOXBORO 871A-2F SENSOR TRANSMITTER *NEW IN A BOX*
NEW FOXBORO M132PN CHART DRIVE
Foxboro I/A Series DM900WT-C Termination Cable Assembly PLC DM9OOWT-C Wire
nos foxboro d0156ch-c 4-20mA cal only transmitter
FOXBORO I/A SERIES MAGNETIC FLOW TRANSMITTER IMT25-PDADB10N-AB 102983
FOXBORO ELECTRONIC TRANSMITTER 821GM-IS1MM2 103042
Foxboro Transmitter Force Motor Assembly N0148SM
FOXBORO SEMICONDUCTOR CIRCUIT POWER SOURCE BOARD D0134AF DB 103299
FOXBORO COMMUNICATION MODULE P0926DP REV-0A
FOXBORO COMMUNICATION MODULE REV 0A P0926DP 104802
Foxboro IDP10-D20B21F-M1L1V IDP10D20B21FM1L1V Pressure Transmitter w Display SAR
Foxboro RTT20-I1SNQFD Ser A Temperature Transmitter NIOB MMC
FOXBORO F0109BQ-C B0142DQ POWER CONVERTER PCB CIRCUIT BOARD D507833
FOXBORO P0901HA USPP P0901HA
FOXBORO P0904AU USPP P0904AU