PLC vs DCS vs SCADA: Qhov sib txawv, Lub Rooj Sib Tham, thiab Yuav Xaiv Li Cas

PLC, DCS, thiab SCADA tau sib xyaw tas li, thiab kev xaiv tsis raug yog kim. Oversize lub system thiab koj them rau kho vajtse koj tsis siv; undersize nws thiab koj tsoo lub qab nthab thaum koj ntxiv ib kab lossis ib qhov chaw thib ob.

Cov lus qhia no txiav los ntawm qhov ntawd nrog lub rooj sib piv, piav qhia meej ntawm txhua qhov system, tus nqi tiag tiag, lub hauv paus kev txiav txim siab, thiab cov lus qhia ntawm hom yuav yuav thiab qhov twg.

Qhov luv version:

• PLC(Programmable Logic Controller): cov txheej txheem ua haujlwm uas khiav cov tshuab ntawm qib ntaus ntawv.
• SCADA(Kev Tswj Xyuas Kev Tswj Xyuas thiab Kev Tau Txais Cov Ntaub Ntawv): cov txheej txheem saib xyuas uas saib xyuas, pom, thiab nkag mus hla cov tshuab thiab qhov chaw.
• DCS(Distributed Control System): cov txheej txheem faib tawm -tswj txheej uas khiav cov txheej txheem loj, txuas ntxiv ua ib qho kev sib koom ua ke.

Ib txoj kab ntim khoom thiab cov roj refinery xav tau cov qauv sib txawv kiag li. Ntawm no yog yuav qhia qhov twg haum koj li.

Kev sib piv ceev: PLC vs DCS vs SCADA ntawm ib sab

Siv lub rooj no rau cov lus teb ceev ceev; cov ntu hauv qab no muab qhov laj thawj.

Nyeem nws zoo li no: PLC yog cov leeg nqaij, SCADA yog qhov muag, thiab DCS yog lub paj hlwb turnkey rau ib txheej txheem loj. Xav tau tus qauv? Xauj pebPLC ntau yamthiabHMI ntau.

PLC (Programmable Logic Controller) yog dab tsi?

PLC yog lub khoos phis tawj uas muaj ruggedized tsim los tswj cov tshuab tshwj xeeb. Nws yog automation's execution txheej: nws nyeem sensor signals, khiav koj logic, thiab switches outputs rau motors, li qub, thiab drives nyob rau hauv lub sij hawm.

PLC ua haujlwm li cas

PLC khiav ib lub voj voog scan tas li: nyeem cov tswv yim, ua tiav qhov kev pab cuam, hloov kho cov zis, rov ua dua. Txhua qhov kev hla yuav siv sijhawm milliseconds, thiab lub sijhawm yog txiav txim siab, yog li cov khoom siv tib yam ib txwm tsim cov lus teb tib yam. Qhov kev twv ua ntej yog vim li cas tus neeg saib xyuas tuaj yeem nres lub conveyor ua ntej ib feem jams. Cov kev zov me nyuam feem ntau yog sau rau hauv ntaiv logic lossis cov ntawv sau.

Cov khoom tseem ceeb

PLC yog tsim los ntawm ob peb qhov tseem ceeb:

• CPU:khiav qhov kev pab cuam thiab txheej txheem logic.
• Fais fab mov:converts AC los yog DC nkag mus rau qhov voltage qhov modules xav tau.
• I/O modules:txuas cov khoom siv hauv teb, digital rau cov teeb liab qhib / tawm, thiab analog rau ntau yam xws li siab lossis kub.
• Kev sib txuas lus modules:Txuas lub PLC rau HMIs, tsav tsheb, thiab kev sib txuas ntawm Modbus, PROFINET, lossis EtherNet/IP.
• Programming ntaus ntawv:lub PC uas sau thiab thauj cov logic.

Xav tau qhov chaw? Saib pebPLC modules.

Compact vs modular PLC

Compact PLCs ntim ruaj I/O, CPU, thiab lub zog rau hauv ib qho me me, qis - nqi tsev, zoo tagnrho rau ib lub tshuab. Modular PLCs cia koj xaiv CPU, lub zog, thiab I / O phaib cais thiab nthuav dav tom qab. Txoj cai ntawm tus ntiv tes xoo: tsau, me me I / O cov ntsiab lus kom compact; kev loj hlob thiab sib xyaw cov cim taw qhia rau modular.

Qhov twg PLCs siv tau zoo tshaj plaws

PLCs tswj hwm kev tsim khoom tsis sib xws, qhov twg ceev thiab rov ua dua qhov tseem ceeb tshaj plaws: ntim thiab palletizing, conveyors, neeg hlau hlwb, thiab automated los ua ke. Kev soj ntsuam ceev ceev thiab kev txiav txim siab tsis sib xws yog qhov kev ua haujlwm siab - nrawm, qhib / tawm haujlwm xav tau.

Muaj zog thiab kev txwv

PLCs yog hloov tau, tus nqi qis, hloov kho tau yooj yim, thiab txhawb nqa los ntawm ntau hom khoom lag luam ecosystem. Qhov txwv yog qhov: PLC tswj cov cav tov zoo tab sis tsis muaj cov nroj tsuag - pom dav ntawm nws tus kheej. Txhawm rau saib ntau lub tshuab lossis qhov chaw los ntawm ib qho screen, koj ntxiv txheej txheej siab dua: SCADA.

SCADA (Kev Tswj Xyuas Kev Tswj Xyuas thiab Kev Tau Txais Cov Ntaub Ntawv) yog dab tsi?

SCADA tsis yog tus tswj. Nws yog txheej txheej software uas zaum saum cov tswj hwm xws li PLCs thiab RTUs, muab cov neeg ua haujlwm ib qho chaw los saib xyuas cov txheej txheem, sau cov ntaub ntawv, thiab nkag mus thaum xav tau.

SCADA ua haujlwm li cas

Lub SCADA system rub tawm cov ntaub ntawv nyob ntawm PLCs thiab cov chaw nyob deb, tom qab ntawd hloov mus rau hauv cov ntxaij vab tshaus, ceeb toom thaum muaj nuj nqis tawm ntawm qhov ntau, thiab tus kws sau keeb kwm uas sau txhua yam rau tiam sis. Nws saib xyuas thiab cov ntaub ntawv; nws tsis khiav tshuab -level logic. Cov tswj hauv qab tseem ua qhov hloov pauv.

Cov khoom tseem ceeb

Kev teeb tsa SCADA feem ntau suav nrog kev saib xyuas cov khoos phis tawj (tus tswv lub davhlau ya nyob twg), cov chaw nyob deb nroog hauv thaj chaw, PLCs ua haujlwm hauv zos, kev sib txuas lus, thiab HMI software cov neeg ua haujlwm saib.

SCADA vs. HMI: Puas yog lawv tib yam?

Qhov no mus ncig ua si rau tib neeg. HMI yog lub interface: lub vaj huam sib luag lossis tshuaj ntsuam tus neeg teb xov tooj nyeem thiab thawb cov lus txib los ntawm. SCADA yog qhov kev saib xyuas loj dua uas suav nrog ib lossis ntau dua HMI ntxiv rau cov keeb kwm, tswb, kev sib txuas lus, thiab cov ntaub ntawv tuav lawv qab. Txhua qhov system SCADA muaj HMI, tab sis HMI ib leeg tsis yog SCADA. Sib piv cov kev xaiv ntawm pebHMI ntau.

Qhov twg SCADA zoo tshaj plaws siv

SCADA khwv tau nws qhov chaw nyob qhov twg koj xav tau kev pom kev hauv nruab nrab thoob plaws ntau lub tshuab lossis sib kis- tawm qhov chaw: dej thiab dej khib nyiab, hluav taws xob thiab khoom siv hluav taws xob, khoom siv hluav taws xob, thiab ntau yam - qhov chaw ua haujlwm saib los ntawm ib chav.

Muaj zog thiab kev txwv

SCADA muab rau koj hauv nruab nrab saib xyuas, tswj chaw taws teeb, thiab cov ntaub ntawv muaj zog. Kev lag luam tawm -offs: tus neeg rau zaub mov tuaj yeem yog ib qho kev ua tsis tiav uas zais tag nrho cov txheej txheem yog tias nws poob, lub kaw lus xav tau kev ruaj ntseg network, thiab nws tsis ua tshuab- theem tswj los ntawm nws tus kheej.

DCS (Distributed Control System) yog dab tsi?

A DCS yog ib qho kev sib koom ua ke uas ua ke nrog kev tswj hwm, kev pom, thiab cov ntaub ntawv txiav tawm los ntawm ib tus neeg muag khoom, tsim rau cov txheej txheem txuas ntxiv loj. Qhov twg PLC ntxiv rau SCADA tuav tswj thiab saib xyuas cais, DCS fuses lawv.

DCS ua haujlwm li cas

Kev tswj tau muab faib thoob plaws ntau yam kev tswj hwm tsis tu ncua muab tso rau ib puag ncig cov nroj tsuag, tag nrho khi ua ke ntawm kev txiav txim siab hauv zos. Cov controllers, engineering software, thiab cov neeg ua haujlwm chaw nres tsheb los ntawm tib tus neeg muag khoom thiab tau sib koom ua ke nruj, yog li lub kaw lus tuaj ze rau turnkey.

Cov khoom tseem ceeb

Lub DCS yog lub chaw haujlwm ntawm engineering workstations rau kev teeb tsa, chaw nres tsheb rau kev saib xyuas, faib cov txheej txheem tswj xyuas uas khiav lub voj voog, cov pob txha sib txuas lus, thiab cov cuab yeej ntse.

Qhov twg siv DCS zoo tshaj plaws

A DCS yog tus qauv uas cov txheej txheem khiav tsis tu ncua, lub sijhawm poob qis heev, thiab kev nyab xeeb yog tswj hwm: roj thiab roj, tshuaj ua haujlwm, tsim hluav taws xob, thiab tshuaj. Cov tsim ua - nyob rau hauv redundancy thiab integrated tswj yog dab tsi cov haujlwm no yuav tsum tau.

Muaj zog thiab kev txwv

Lub DCS muaj kev ntseeg siab heev, sib sib zog nqus rov ua dua, kev sib koom ua ke nruj, thiab muaj kev tswj hwm zoo. Nws kuj tseem kim, nruj, xav tau tshwj xeeb engineering, thiab feem ntau overkill rau discrete manufacturing. Rau feem ntau me me thiab nruab nrab- cov nroj tsuag loj, nws yog qhov system ntau dua li qhov xav tau ntawm txoj haujlwm.

Thaum twg yuav hloov kho los ntawm PLC ntxiv rau SCADA rau DCS:cov cim qhia meej. Koj tus lej I/O nce mus rau ntau txhiab; koj cov txheej txheem tseem ceeb yog tas mus li; regulators los yog cov teeb meem kev nyab xeeb xav tau ntawv pov thawj redundancy; thiab lub sijhawm ua haujlwm tsis cuam tshuam tsis yog - sib tham. luv luv ntawm cov, PLC ntxiv rau SCADA feem ntau ua haujlwm tsawg dua.

PLC vs DCS vs SCADA: Qhov Sib txawv tseem ceeb piav qhia

Cov lus txhais qhia koj tias txhua qhov system yog dab tsi. Qhov sib txawv qhia koj yuav xaiv li cas. Txhua axis xaus nrog qhov nws txhais tau li cas rau koj qhov kev txiav txim siab.

Control vs saib xyuas

PLCs thiab DCS controllers yeej tswj cov khoom: lawv xa cov teeb liab uas txav cov khoom siv hauv teb. SCADA saib xyuas: nws saib, cov ntaub ntawv, thiab lub tswb, tom qab ntawd tso siab rau cov tswj hwm los ua. Xav tau lub tshuab ua haujlwm, thiab koj xav tau tus maub los; SCADA ib leeg yuav tsis txav lub valve.

Discrete vs nruam

Qhov no yog qhov tseem ceeb tshaj plaws axis. PLCs yog tsim los rau kev sib cais, siab -ceev, qhib / tawm, thiab cov lus tsa suab. Lub DCS yog tsim rau cov txheej txheem txuas ntxiv nrog cov voj voog analog, zoo li qhov kub thiab txias hauv lub reactor. SCADA nthuav tawm ob qho tib si. Txheeb xyuas koj cov txheej txheem ua ntej, thiab qhov kev xaiv nqaim sai.

Centralized vs faib vs saib xyuas

PLC yog tus tswj hwm hauv zos. Lub DCS faib kev tswj tsis tu ncua hla cov nroj tsuag hauv ib tus neeg muag khoom; SCADA suav nrog cov tswj hwm hauv qab nws. Tib lo lus, "tswj," peb hneev taw sib txawv.

Redundancy, kev ntseeg siab, thiab scan lossis teb lub sijhawm

Kev nrawm thiab kev ntseeg tau cais lawv hauv kev xyaum. PLCs luam theej duab nyob rau hauv kwv yees ib - tus lej rau qis kaum ntawm milliseconds, nrog redundancy raws li kev xaiv ntxiv - rau. Lub DCS yog engineered rau siab muaj, nrog redundant controllers, tes hauj lwm, thiab hwj chim raws li tus qauv. SCADA kev ntseeg tau leans ntawm lub network thiab server tsim.

Kev koom ua ke thiab cov neeg muag khoom xauv -in

Ib tus neeg muag khoom DCS nkaus xwb thiab yooj yim dua rau kev ua haujlwm, tab sis nws kaw koj rau hauv tus neeg muag khoom kho vajtse thiab tus nqi. PLC ntxiv rau SCADA cia koj sib xyaw hom thiab qhov chaw dawb, ntawm tus nqi ntawm kev sib koom ua ke ntawm koj tus kheej. Qhib cov qauv zoo li OPC UA kom txo qhov kev sib txhuam. Qhov kev ywj pheej los sib xyaw cov npe tseem ceeb thaum koj yuav, raws li peb npog hauv qab no.

PLC, SCADA, thiab DCS puas tuaj yeem ua haujlwm ua ke? (Hybrid Architectures)

Nov yog qhov feem ntau cov lus qhia faus: koj tsis tshua xaiv ib qho. Cov nroj tsuag tiag tiag muab cov tshuab no hauv cov txheej txheem.

Lub automation pyramid nyob rau hauv cov ntsiab lus

Kev tswj hwm kev lag luam feem ntau yog kos raws li lub pyramid, tus qauv ISA-95. Hauv qab yog theem teb: sensors thiab actuators. Saum toj no nws yog qib tswj, qhov twg PLCs thiab cov txheej txheem tswj tau khiav lub logic. Saum toj no yog qib saib xyuas, qhov twg SCADA saib cov haujlwm. Txhua qhov system nyob ntawm nws tus kheej txheej.

Ib txwm hybrid teeb

Ib qho kev teeb tsa: PLCs khiav ntawm tus kheej lub tshuab thiab lub hlwb; SCADA zaum saum toj los muab cov neeg ua haujlwm saib ib qho ntawm cov kab, tswj cov zaub mov, thiab kev ua haujlwm ntawm lub cav; thiab qhov twg qhov txheej txheem txuas ntxiv xav tau nws, DCS lossis MES txheej ntxiv. Ib tsob nroj zaub mov tuaj yeem khiav PLCs ntawm nws cov kab ntim thiab ntim khoom, ib txheej SCADA hla ntawm qhov chaw, thiab DCS tsuas yog rau qhov kub thiab txias - theem tseem ceeb sib xyaw.

Yuav ua li cas IIoT, OPC UA, thiab ntug yog qhov muag plooj cov kab

Cov thev naus laus zis tshiab yog loosening cov ciam teb qub. Qhib cov txheej txheem xws li OPC UA thiab MQTT cia Siemens PLC, thib peb - tog SCADA platform, thiab kev lag luam software pauv cov ntaub ntawv ncaj qha, tsis hais tus neeg muag khoom. Edge li txheej txheem cov ntaub ntawv nyob ze lub tshuab txiav latency. Qhov tshwm sim yog hloov tau yooj yim dua, sib xyaw- cov neeg muag khoom architectures ntau dua kaum xyoo dhau los.

PLC vs DCS vs SCADA: Tus nqi sib piv

Cov peev nyiaj feem ntau yog cov lus nug tiag tiag cov neeg yuav khoom tuaj nrog, thiab cov lus qhia feem ntau hla nws. Ntawm no yog cov kev muaj tiag thiab dab tsi ua rau lawv. Kho txhua daim duab raws li qhov kev txiav txim - ntawm- qhov ntsuas qhov ntsuas, tsis yog nqe lus.

Dab tsi tsav nqi

Tsib yam tseem ceeb txav tus lej feem ntau: I / O suav (muaj pes tsawg lub cim koj txuas), qhov rov ua dua uas koj teev, engineering thiab programming ua haujlwm, software ntawv tso cai, thiab kev sib koom ua ke nyuaj. Ob cov nroj tsuag nrog tib lub ntsiab lus tuaj yeem tsaws deb ntawm cov no.

Ballpark ntau yam

Raws li cov lus txiav txim ntxhib ntawm qhov loj:

Cov no yog cov phiaj xwm kev npaj nkaus xwb, tsis yog cov lus hais. Tus nqi tiag tiag nyob ntawm I / O suav, cheeb tsam, thiab tus nqi ua haujlwm. Rau qhov tseeb daim duab,thov ib nqe lus.

Tag nrho cov nqi ntawm cov tswv cuab

Tus nqi yuav khoom tsuas yog ib feem ntawm nws. Tag nrho cov nqi ntawm kev ua tswv cuab kuj suav nrog cov khoom seem, cov sij hawm ua cov hmoov txhuas, kev txhawb nqa, thiab yooj yim npaum li cas koj tuaj yeem hloov pauv xyoo tom qab. Ib tug ntau- tus neeg muag khoom lag luam nrog cov khoom hauv Tshuag thiab xa luv luv txiav cov khoom kim tshaj plaws ntawm txhua qhov: lub sijhawm tsis tau npaj tseg.

Yuav Xaiv Li Cas: PLC vs DCS vs SCADA (Decision Framework)

Ua hauj lwm los ntawm peb cov lus nug nyob rau hauv kev txiav txim, ces xyuas cov kev lag luam shortcuts.

Kauj ruam 1: Discrete los yog tas mus li txheej txheem?

Pib nrog koj tus txheej txheem. Puas yog nws tsis sib xws (cov khoom sib txawv, qhib / tawm thiab cov lus tsa suab) lossis txuas ntxiv (cov khoom ntws, cov voj voog analog, khov kho- xeev tswj)? Discrete ua haujlwm taw qhia rau PLC, feem ntau nrog SCADA saum toj. Ib qho kev txuas ntxiv, loj - cov txheej txheem ntsuas rau DCS. Ib lo lus teb no tshem tawm feem ntau ntawm daim teb.

Kauj ruam 2: Muaj pes tsawg I/O cov ntsiab lus thiab qhov chaw?

Tom ntej no, suav I/O cov ntsiab lus thiab qhov chaw. Ib lub tshuab ib zaug, lossis ib qho me me - kab ntawm qhov chaw nrog I/O me me, yooj yim rau PLC, feem ntau nrog HMI. Ntau lub tshuab, ntau qhov chaw, lossis cov cuab tam tej thaj chaw deb saib hauv nruab nrab hu rau SCADA saum toj. Ntau txhiab tus I/O ntawm cov txheej txheem txuas ntxiv thawb koj mus rau DCS.

Kauj Ruam 3: Cov peev nyiaj, rov ua dua, thiab hauv - kev txawj hauv tsev?

Thaum kawg, ntsuas nyiaj txiag, rov ua dua, thiab hauv - kev txawj hauv tsev. Kev siv nyiaj nruj, pab pawg ua haujlwm tau zoo hauv PLC programming, thiab cov txheej txheem uptime xav tau PLC ntxiv rau SCADA. Kev rov ua dua tshiab, kev tswj hwm kev nyab xeeb, thiab kev ua haujlwm tas mus li qhov chaw nres yog txaus ntshai lossis raug nqi tsim nyog rau DCS.

Cov lus pom zoo nrawm los ntawm kev lag luam

Fast shortcuts:

• Ntim, Automotive, General Assembly:PLC, feem ntau nrog SCADA.
• Khoom noj khoom haus thiab dej haus:PLC ntxiv rau SCADA, nrog rau DCS nkaus xwb rau cov theem txuas ntxiv tseem ceeb.
• Dej thiab dej khib nyiab:SCADA hla PLCs thiab RTUs rau ntau- xyuas qhov chaw.
• Roj thiab roj, tshuaj, lub zog:DCS raws li lub hauv paus.

Cov no yog cov ntsiab lus pib, tsis yog txoj cai.Tham nrog peb cov engineersrau cov lus qhia sib phim rau koj kab.

Xaiv Lub Hom Phiaj Zoo thiab Qhov Yuav Yuav

Thaum koj paub hom kab ke, ob lo lus nug tseem nyob: Hom twg thiab yuav qhov twg? Hom kev xaiv yog tsawg dua ntawm qeb duas.

Cov hom loj sib piv

Cov hom tswj loj txhua tus muaj qhov profile meej:

• Siemens:Cov txheej txheem thoob ntiaj teb, ntawm qhov loj SIMATIC ecosystem (S7-1200 thiab S7-1500) thiab TIA Portal software, muaj zog hauv kev sib cais thiab kev ua haujlwm.
• Allen-Bradley (Rockwell):lub neej ntawd thoob plaws North America, nrog ControlLogix, CompactLogix, thiab nruj FactoryTalk kev koom ua ke, feem ntau hauv tsheb thiab zaub mov thiab dej haus.
• Schneider Electric:Modicon kab, muaj zog hauv lub zog, dej, thiab kev siv hauv tsev.
• ABB:zoo- tau tsim nyob rau hauv cov txheej txheem kev lag luam, lub zog, thiab neeg hlau, nrog AC500 PLC tsev neeg.
• Mitsubishi:muaj zog thoob plaws Asia thiab tus nqi - zoo rau siab - ceev ceev discrete thiab ntim ntawm MELSEC kab.
• Omron:nquag xaiv rau ntim thiab khoom siv hluav taws xob sib dhos, nrog kev sib xyaw ua ke, kev pom, thiab kev txav.

Tsis muaj ib lub npe zoo tshaj plaws, tsuas yog qhov zoo tshaj plaws haum rau koj daim ntawv thov, cheeb tsam, thiab cov khoom siv uas twb muaj lawm.

Tshiab vs nyiaj seem, txhuas lub sij hawm, thiab spare qhov chaw

Cov chav nyob tshiab nqa tag nrho warranty thiab cov firmware tshiab tab sis raug nqi ntau dua thiab tuaj yeem muaj sijhawm ntev dua. Cov khoom seem lossis cov khoom siv kho dua tshiab raug nqi tsawg dua thiab tuaj yeem cawm tau ib txoj kab thaum qhov kev txiav tawm tsis ua haujlwm, nrog kev lav tsis pub dhau kev lag luam -tawm. Nyob rau hauv ib qho kev sib tawg sai, muaj thiab xa khoom ceev tseem ceeb tshaj li cov ntaub ntawv.

Yog vim li cas ib tug multi-brand tsum pab

Qhov no yog qhov uas tus neeg muab khoom lag luam ntau - tau txais nws khaws cia. Koj tuaj yeem sib xyaw cov npe thoob plaws ib qhov project, qhov chaw PLCs, HMIs, thiabVFDslos ntawm ib qho chaw, tau txais cov khoom sai dua, thiab muaj cov modules customized rau spec. Ntawm Chentuo, qhov ntawd yog tus qauv: ntau ntau - cov khoom lag luam cov khoom lag luam, kev xa khoom luv luv, thiab cov qauv hloov kho tau thoob plaws cov tuam txhab loj. Qhia peb seb koj tab tom tsim dab tsi thiabthov ib nqe lus.

Kev xaus thiab cov kauj ruam tom ntej

PLC, SCADA, thiab DCS tsis yog cov neeg sib tw; lawv yog peb txheej. Lub PLC ua tiav ntawm qib tshuab, SCADA saib xyuas thoob plaws lub tshuab thiab chaw, thiab DCS khiav cov txheej txheem txuas ntxiv ua ib qho kev sib koom ua ke. Rau feem ntau me me thiab nruab nrab - loj discrete los yog lub teeb- cov txheej txheem ua haujlwm, lub suab pib yog pib nrog PLC, ntxiv SCADA thaum koj xav tau cog- pom dav dav, thiab khaws DCS rau cov txheej txheem txuas ntxiv, siab - ceg txheem ntseeg.

Thaum koj txav los ntawm kev npaj mus rau qhov chaw, phim kho vajtse rau koj qhov kev txiav txim siab. Xauj pebPLC, HMI, thiabVFDrange, lubthov ib nqe lusthiab peb cov engineers yuav pab koj spec txoj cai.

FAQ

 

 

PLC thiab SCADA puas tuaj yeem ua haujlwm ua ke?

Yog, thiab feem ntau lawv ua. Lub PLC khiav lub tshuab- theem logic, thaum SCADA zaum saum toj los saib xyuas, pom, thiab nkag mus hla kev ua haujlwm. Nws yog qhov feem ntau architecture nyob rau hauv discrete thiab light- txheej txheem nroj tsuag.

Qhov twg zoo dua: PLC, SCADA, lossis DCS?

Tsis muaj leej twg yog universally zoo dua, vim lawv daws teeb meem sib txawv. PLCs haum ceev ceev discrete tswj, SCADA suits centralized saib xyuas, thiab ib tug DCS suits loj nruam txheej txheem. Feem ntau cov nroj tsuag sib xyaw ua ke. Siv cov txheej txheem kev txiav txim siab saum toj no kom phim koj rooj plaub.

PLC vs DCS vs SCADA vs HMI, qhov txawv yog dab tsi?

Lub PLC tswj cov tshuab, DCS tswj cov txheej txheem tas mus li, thiab SCADA tswj hwm txhua tus ntawm lawv. HMI yog lub vijtsam uas tus neeg siv khoom siv; Nws yog ib feem, feem ntau yog ib feem ntawm SCADA lossis PLC system, tsis yog kev tswj hwm ntawm nws tus kheej. Sib piv HMIs hauv pebHMI ntau.

PLC, SCADA, lossis DCS tus nqi ntau npaum li cas?

Raws li kev kwv yees ntxhib, PLC ntxiv rau HMI ntawm ib kab khiav los ntawm ntau txhiab tus qis, PLC ntxiv rau SCADA rau qhov chaw me me los ntawm kwv yees li $ 10,000 mus rau ntau pua txhiab tus, thiab DCS los ntawm kwv yees li $ 250,000 thiab nce. Cov no yog cov phiaj xwm phiaj xwm, tsis yog nqe lus.Thov ib daim ntawv tsocairau koj qhov tshwj xeeb.

Kuv puas xav tau DCS, lossis PLC ntxiv rau SCADA txaus?

Rau feem ntau me me thiab nruab nrab - cov nroj tsuag loj, PLC ntxiv rau SCADA yog txaus thiab pheej yig dua. Txav mus rau DCS thaum koj cov txheej txheem tsis tu ncua, koj qhov I / O khiav mus rau ntau txhiab, thiab cov ntawv pov thawj rov ua dua lossis cov sijhawm ua haujlwm nruj heev. Txwv tsis pub, PLC ntxiv rau SCADA feem ntau yeej.

PLC hom twg yog qhov zoo tshaj plaws: Siemens, Allen-Bradley, lossis Mitsubishi?

Nws nyob ntawm cheeb tsam thiab daim ntawv thov. Siemens yog tus thawj coj thoob ntiaj teb, Allen-Bradley coj hauv North America, thiab Mitsubishi yog tus nqi- zoo rau kev ua haujlwm siab - nrawm nrawm hauv Asia. Sib piv cov hom rau koj cov khoom siv uas twb muaj lawm thiab kev txhawb nqa network. Peb Tshuag tag nrho peb, yog lixauj PLCs los ntawm homlos yog nug peb pab neeg.

Kev sab laj pub dawb