Realize distributing center control with PC and PLC

Realize distributing center control with PC and PLC (DCS) fundamental is distributing center pilot is basic the thought is centralized management, dispersive control. Namely: The management of the automata process flow industry and operation administrator to automata process the course is relatively separate; The automata process of flow industry stands to be finished automatically relative to independent ground by each control, and the operation personnel administration to automata process is finished by the operation station of central control room. Central operation station and each spot control stand to move relative to independent ground severally on one hand, it is all sorts of breakdown limitation thereby inside local limits, raised the security with automation total system and dependability greatly; Undertake news report of real time data and information are exchanged each other again on the other hand, the operation station that realized room of control of operation personnel centrally undertakes manage and be adjustmented to whole automata process. The main task that spot control stands is to realize opposite to produce the automata of the process, all sorts of craft parameter that accordingly it needs to be able to gather entire plant automatically surely (the temperature that is like all sorts of craft medium, pressure, discharge, viscosity, constituent, content height) and the moving condition of equipment (be like valve degree, of machine pump stop, equipment shakes, mechanical displacement) wait for manufacturing information, undertake according to the control program that has written beforehand much numerical value is calculated next, signal of imitate of standard of final output 4~20mA (or ON/OFF number signal) go drive the actuator such as all sorts of valve, electric machinery, adjust all sorts of craft parameter, implementation produces the automata of the process; Have real time news report with operation station even additionally, all sorts of production that collect information conveys to operate a station to be used for operating personnel, all sorts of instructions that receive operation personnel to be given out through operating a station at the same time adjust automation plan in real time, optimize manufacturing process. Accordingly it still needs to have the communication interface of standardization. All sorts of current PLC all have such function, and its capacity flexibility is big, augment is convenient, the configuration that dominates program learns easily simply, performance/price ratio is advantageous, because this is medium or small,the operates a station ideal of DCS chooses. The operation station of central control room is interface of a man-machine actually, all sorts of production information that gather control station on one hand undertake machining handling, harmony of trend of forms for reporting statistics of all sorts of flow pictures that place is used to and are familiar with in order to operate personnel next, production, history calls the police solely wait for a form to provide operation personnel. The operation conveys to stand to undertake adjustment to dominating program after having all sorts of statements that operate personnel coding on the other hand, in order to optimize manufacturing process or the urgent processing to special situation. Right medium or small DCS will tell, at present all sorts of more popular monitoring software on market all can realize such function, and do not have special requirement to the hardware of the computer and operating system, add software of a monitoring to be able to come true with average PC. With the PC + when PLC forms system of distributing center control, PLC assumed the spot to control the job of the station, the PC assumed operation station and the job that the engineer stands. The line can leave on the PC that there is PLC system software in installation (or online) the control application software that edits PLC (call echelon to pursue commonly) , after control application software downloads PLC, PLC finishs field data to collect independently, logistic control, imitate control. And all sorts of functions that operate a station can be passed " software of real time monitoring " + " PC " will come true, OK and convenient opposite produces a process undertake monitoring on the PC that there is software of real time monitoring in installation. 2.

Realize distributing center control with PC and PLC (DCS) one 2.

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Process brief introduction: Liquefied ammonia store carry workshop section is Guizhou grand blessing is industrial the important composition part in developing finite head office to produce per year 800 thousand tons of device that weigh calcium to change the ability of phosphorous ammonium to revise a project, ability of design discharge ammonia 250 tons / hour, ability of amortize of coal tub area 9000 tons. Ammonia often presses next is in normal temperature gas, explode combustibly, easily, poisonous, harmful; Liquefied ammonia store one of tall danger areas that carry workshop section is head office, safe production is the key of Lv of this automation system take an examination. 2.

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Control systematic general situation: To enhance manufacturing security, the craft parameter place that in controlling a system originally counterpoise wants was adopted " 3 take 2 vote " politic, designed 21 each to use chain return circuit, undertake interlinking protective to producing a course; Move to make sure those who produce a course is smooth and energy-saving fall bad news, the system designed 6 to adjust loop. It is facilitating monitoring and operation, in the operation the station devised plan of total appearance of picture of a flow, concentration showed with the parameter of a batch of craft closely related safe production, equipment moving state state is mixed call the police information; Unit to other chemical industry unit process of cargo bandling designed appearance of relevant bureau region flow, comprehensive ground showed all sorts of detailed production information related to its; The basis operates the habit of personnel, in the operation the station designed appearance of 4 groups of groups, display temperature, pressure, discharge and juice centrally respectively signal; Adjust to 6 loop was designed respectively adjust picture, those who realize pair of PID parameter is whole calm, the hand of the switch of automatic mode and exchange part valve changes the hand operation; Main to 21 valve was designed respectively shoot picture of switch giving form, those who realize opposite to produce a course accuse oneself or remote control; Devised historical trend plan to main craft parameter, provided data to breakdown is diagnosed and optimize control. Produce completely to ensure public security truly, implementation is handled to the lash-up of urgent accident, add to 6 adjuster loop outfit is exterior and automatic dog adjuster, once appear,control systematic breakdown, automatic switch arrives dog adjuster controls control valve independently at DCS; Main to 21 valve adds outfit lash-up to handle pushbutton, realize the compulsive switch to valve at DCS independently. 2.

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Hardware configuration: Control station chooses the C200 of OMRON PLC, configured digital module (OD211/ ID212) 9, imitate module (AD003) 4, adjust module (PID03) 3; Operation station chooses computer of DELL OPTIPLEX GX150; Engineer station chooses COMPA PC. Form a graph to be as follows: Graph 1 hardware is configured 2.

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Control station software configuration: The configuration that controls a station uses the systematic software SSS of OMRON to regard a technology as platform, with echelon the graph regards process designing as the tool, its configuration content basically has: 2.

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The allocation of PLC in-house location: The allocation of I/O address: The I/O address of PLC is PLC and spot detect the only one to one correspondence register address that equipment, actuator has data corresponds, the allocation of I/O address is the base that has farther configuration to PLC; To OMRON-C200 character, i/O address and module of place connective I/O are concerned; Receive the spot facility on digital module repeatedly, its I/O address depends on the installation position of I/O module and the drop sign on this module, receive the spot facility on imitate module, PID module repeatedly, its I/O address depends on the unit date of I/O module (different module should set different unit date through the hard switch of module) order number with what go up in this module; It is for instance in this systematic configuration, the radar fluid of the spot change send implement the imitate signal of the 4~20mA that LT-101 outputs joins in unit date is the imitate of 3 to input module AD003 on 2 o'clock, criterion the address of its configuration in PLC is IR: 132; And of valve HV120 shut condition signal (Closed) the number of the 2nd chamfer inputs the patulous frame that join is in to installation of module ID212 on 10 o'clock, criterion the address of its configuration in PLC is IR: 01210; In this system, define I/O address 142 a little bit in all. Operation station and control station data exchange the allocation of the address: The in-house register that writes PLC through reading will finish handle station and the data communication that control a station, the real time news report that operates station and control station to come true, still must configure enough in-house register address to put store for PLC these data; For instance, definition DM0232 regards an operation as station and LT of control station exchange - the in-house register of the data of 101, criterion PLC collect LT - the fluid of 101 lay aside is put to be in after signal passes pretreatment DMO232, and the operation stands to be read to the DM0232 of PLC take LT - the database that the data of 101 will come build his; In this system, define this kind of address 184 a little bit in all. The allocation of intermediate address: PLC is in moving process, the data when still needing many intermediate register to deposit those operation processes to be faced mediumly, apply the readability of the program to rise, also must have necessary definition and explanatory note to these register. 2.

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Pursue self-adjusting to control strategy to write echelon: 3 PID03 module is chosen to comprise 6 to adjust in this system the automata that loop will come to to complete manufacturing process, for convenient operation personnel stands in the operation the management to controlling a process, the SW2 of PID03 should be installed for ON, write corresponding echelon graph to be exchanged in order to realize the data of PLC and PID03, for instance: Adjust melt down PIC111 is finished for the 2nd loop of the PID03 of 5 by unit date, when executive graph 2 show a paragraph of program hind, the data in DM0060 of the address in PLC is to adjust by the definition the set-point of loop PIC111. Graph 2 write set to be worth for PIC111 3 take 2 vote: To assure safe production, the pressure that often controls coal tub must control the limits in the regulation inside, every are elevatory (reduce) arrive when certain limits, must start (stop) corresponding equipment; For this, in the spot with 3 pressures the watch measures its pressure, undertake comparative to 3 pressure in PLC, when 2 in having 3 only have a requirement at the same time, interlink ability movement; When writing echelon to pursue, use dictate quite, plus with, or, the logistic instruction such as blame can implement this control strategy. (echelon pursues slightly) chain protection: Echelon graph and electric chain logic pursue very similar, after I/O address is affirmatory, to interlink protection to write echelon the graph is operated already simple readability is strong. To protect equipment and manufacturing security, this system writes chain return circuit in all 21. (echelon pursues slightly) 2.

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The setting of I/O module and corrective: Echelon graph is written after finishing, still must undertake to I/O module necessary setting is mixed corrective, PLC ability works normally; Imitate module should set the input signal sort that answers relatively with spot equipment and the pretreatment means to inputting signal, still answer corrective to undertaking with span at 0 o'clock; PID module undertakes installing besides the phyletic to inputting signal, pretreatment method that inputs signal outside, reach its to modify way to the content of PID module memery block even, adjust the content such as the control action of the modification means that loop set is worth, PID and its control means undertakes installing. 2.

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Operate the configuration of station software: The configuration that operates a station chooses the systematic software FIX32 of INTELLUTION to regard a technology as platform: Its are main content includes: Systematic configuration, build trend of history of flow chart of database, scale, definition and forms for reporting statistics to wait. Systematic configuration is namely actually in this system on the PC installation FIX system, its are main the installation catalog that content is definition FIX system, driver of installation interface equipment deploys SCADA system, configuration calls the police system, configuration network. FIX is offerred have warehouse of giant driver of I/O interface equipment, this systematic configuration controls a station to be the PLC of OMRON, because this wants OMR of driver of selection installation I/O.

The PLC of Drv and OMRON has news report. Build a database: The database is SCADA system bilks the foundation with the job, it is formed by a series of several foothold, every several foothold are a functional piece actually, FIX provided all sorts of functions piece the need that differs in order to satisfy, these functional piece or equipment of butt joint mouth are read keep data, or logarithm calls the police according to undertaking operation is mixed processing. A several foothold are built to define a functional piece namely in the database, its content includes: Functional piece type, a date of several foothold, annotate, at 0 o'clock, span, interface equipment, i/O address, the format of data, call the police on, floor level. Be like: An AI module is added in the database, in the definition in its attribute dialog box: "Date " for " LT-101 " , "Description " for " amortize sphere F0101A fluid " , "Interface equipment " for " OMR " , "I/O address " for " D: DM: 232 " , "The format of data " for " 12AL " , "At 0 o'clock " for " 0 " , "Span " for " 17 " , "Unit " for " M " ; Built LT-101 of a several foothold in the database, the data in the register that it reads the address in taking PLC to be DM0232 (0 -4095) , change the data that is 0-17M to offer FIX other functional piece and flow chart are called. Scale flow chart: Flow picture is interface of a man-machine actually, understand and operation personnel controls those who produce a course namely through flow picture, so flow picture wants information already comprehensive, want again simple and compendious. The plot tool that FIX system provided WINDOWS color and accuse, can very conveniently a variety of dynamic pictures come to scale the requirement of contented operation personnel. For instance: In flow picture, the juice that displays amortize sphere F0101A for figure ground, want property of fill of trends of the pitch on in the dynamic and characteristic dialog box in its graph only, the height that defines its fill quality is followed " date " for " LT-101 " the size of data and change; Display this juice for accurate ground actual height, a dynamic data can be defined to join by pushball canister graph, join arrives " date " for " LT-101 " several foothold; To show the working state of all sorts of valve intuitionisticly, in its color of trends of the pitch on in dynamic attribute dialog box of the graph changes, valve closes show dormant red, valve leaves show dormant green, valve closes occurrence breakdown to show aglimmer red, valve opens occurrence breakdown to show aglimmer green; To control valve quickly, play it join of picture of switch giving form arrives on its graph, need to click its graph with the mouse only, shoot a switch picture namely, the object place on implementation flow picture sees namely earning. Definition forms for reporting statistics: Already carried out an electron to turn office considering head office, all sorts of forms for reporting statistics all are installed save a file to time, operation personnel can be called at any time according to need, and as the OA carry out, with the enterprise interior government net links a network, be browsed through WEB page and call. 3.

This control system casts the last word to come with 2 years many, function stability, move reliable, the interface is friendly, the operation is simple, safeguard workload very small, got operate and safeguard the welcome of personnel; Cast after using, change the job to needed to undertake enlarge look all did not affect normal production 2 times again according to ability, practice proves PC+PLC forms DCS, the system configures configuration of agile, software simple, facilitating proper motion is designed and debug, performance/price ratio is advantageous, the system is patulous and light and safeguard workload small, it is the enterprise undertakes technical reformation is mixed medium or small produce process first selection control a system oneself. CNC Milling