PLC peb qhov loj: hloov ntau, analog kom muaj nuj nqis, mem tes kom muaj nuj nqis. Tsuav koj txheeb xyuas qhov kev sib raug zoo ntawm peb, koj yuav muaj peev xwm txawj ntse PLC
Kev suav ntawm kev hloov pauv ntau
1.A switching quantity, also known as a logic quantity, refers to a quantity that has only two values, 0 or 1, ON or OFF. Nws yog kev tswj hwm feem ntau siv, thiab kev tswj hwm nws yog lub zog ntawm PLC, thiab yog qhov yooj yim tshaj plaws ntawm PLC.
Lub hom phiaj ntawm kev tswj kev hloov pauv yog ua kom PLC tsim cov kev hloov pauv hloov pauv raws li cov tswv yim tam sim no ua ke ntawm kev hloov pauv ntau thiab cov ntaub ntawv keeb kwm, kom lub kaw lus tuaj yeem ua haujlwm raws li kev txiav txim siab. Yog li ntawd, qee zaum nws yog hu ua sequential control.
Sequence tswj kuj muab faib ua phau ntawv, semi-automatic lossis tsis siv neeg. Cov ntsiab cai tswj siv yog decentralized, centralized thiab hybrid tswj.
2.Analog kom muaj nuj nqis yog hais txog qee qhov kev hloov pauv ntawm lub cev tsis tu ncua, xws li voltage, tam sim no, siab, ceev, ntws tus nqi, thiab lwm yam.
PLC yog tsim los ntawm relay tswj tom qab qhia microprocessor thev naus laus zis, uas tuaj yeem yooj yim thiab ntseeg tau siv rau kev hloov pauv. Raws li analog tuaj yeem hloov mus rau digital, digital tsuas yog hloov pauv ntau yam, yog li cov hloov pauv analog, PLC kuj tuaj yeem ua tiav kev tswj hwm kev tswj hwm.
Vim tias cov txheej txheem tsim khoom tas mus li feem ntau muaj analog, yog li kev tswj hwm analog yog qee zaum hu ua txheej txheem tswj.
Analog feem ntau tsis yog hluav taws xob, thiab PLC tsuas tuaj yeem ua cov digital, hluav taws xob. Txhua yam uas yuav tsum tau ua kom paub txog kev hloov dua siab tshiab ntawm lawv yog lub sensor, uas hloov cov analog kom muaj nuj nqis rau hauv cov hluav taws xob digital. Yog hais tias tus nqi hluav taws xob tsis yog tus qauv, tab sis kuj los ntawm lub transmitter, tus nqi hluav taws xob tsis yog tus qauv rau hauv cov qauv hluav taws xob, xws li 4-20mA, 1-5V, 0-10V thiab lwm yam.
Nyob rau tib lub sij hawm yuav tsum muaj analog input unit (A / D), cov qauv hluav taws xob cov teeb liab rau hauv cov teeb liab; analog tso zis unit (D / A), nyob rau hauv thiaj li yuav PLC tom qab ua cov digital ntim rau hauv analog yog ib tug qauv hluav taws xob teeb liab, yog li cov qauv hluav taws xob teeb liab, kev hloov pauv digital ntawm kev siv ntau yam kev ua haujlwm.
Qhov no yuav tsum tau qhia meej txog qhov kev daws teeb meem ntawm chav tsev analog thiab cov qauv hluav taws xob teeb liab.
[Piv txwv li]
Qhov kev daws teeb meem ntawm PLC analog unit yog 1/32767, tus qauv siv hluav taws xob sib xws yog 0-10V, thiab qhov yuav tsum tau kuaj xyuas yog qhov ntsuas kub ntawm 0-100 degree . Tom qab ntawd 0-32767 sib raug rau qhov ntsuas kub ntawm 0-100 degree . Tom qab ntawd xam cov lej digital sib raug rau 1 degree yog 327.67. Yog tias koj xav ua kom qhov ntsuas kub qhov tseeb rau 0.1 degree, muab 327.67/10 tuaj yeem ua tau. Analog tswj muaj xws li: kev tawm tswv yim tswj, pub-rau-tswj tswj, tswj proportional, fuzzy tswj, thiab lwm yam. Cov no yog tag nrho cov digital quantities nyob rau hauv lub PLC. Cov no yog cov txheej txheem ntawm kev suav cov lej digital hauv PLC.
3. Pulse yog ib qho digital uas nws tus nqi ib txwm hloov ntawm 0 (qib qis) thiab 1 (siab). Tus naj npawb ntawm alternating mem tes hloov ib ob yog hu ua zaus.
PLC pulse kom muaj nuj nqis tswj lub hom phiaj yog qhov tseem ceeb ntawm txoj hauj lwm tswj, tswj kev txav, kev tswj txoj kev. Piv txwv li: Tus naj npawb ntawm pulses yog siv los tswj lub kaum sab xis.
Lub subdivision ntawm tus tsav tsheb stepper yog 10000 ib kiv puag ncig, thiab lub stepper motor yuav tsum tig 90 degrees, ces tus nqi ntawm cov pulses yuav tsum tau ua raws li=10000/(360/90)=2500.
Kev suav ntawm analog
1, -10-10V. -10V-10V voltage hloov mus rau F448-0BB8Hex (-3000-3000) ntawm 6000 daws teeb meem; E890-1770Hex (-6000-6000) ntawm 12000 daws teeb meem.
2, 0-10V. 0-10V voltage hloov mus rau 0-1770Hex(0-6000) ntawm 12000 daws teeb meem; 0-2EE0Hex(0-12000) ntawm 12000 daws teeb meem.
3, 0-20mA. 0-20mA tam sim no hloov mus rau 0-1770Hex(0-6000) ntawm 6000 daws teeb meem; nws hloov mus rau 0-2EE0Hex(0-12000) ntawm 12000 daws teeb meem.
4, 4-20mA, 4-20mA tam sim no, hauv 6000 kev daws teeb meem raug hloov mus rau 0-1770Hex (0-6000): 12000 kev daws teeb meem hloov mus rau {{ 7}}EE0Hex (0-12000).
Cov saum toj no tsuas yog cov lus qhia luv luv xwb, PLCs sib txawv muaj cov kev daws teeb meem sib txawv, thiab lub cev qhov ntau koj ntsuas tau paub ntau yam sib txawv. Cov txiaj ntsig kev suav yuav muaj qee qhov sib txawv.
Nco tseg: Yuav tsum tau xaim analog inputs
1.Siv shielded twisted-pair cable, tab sis tsis txhob txuas cov ntaub thaiv npog.
2. Thaum tsis siv cov tswv yim, luv luv VIN thiab COM terminals.
3. cais cov kab teeb liab analog ntawm cov kab hluav taws xob (AC fais fab kab, kab hluav taws xob siab, thiab lwm yam).
4. Thaum muaj kev cuam tshuam ntawm cov khoom siv hluav taws xob, nruab ib lub attenuator ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob.
5. Tom qab lees paub qhov raug xaim, lub zog ntawm CPU chav ua ntej thiab tom qab ntawd lub load.
6. Thaum disconnecting lub hwj chim mov, thawj disconnect lub hwj chim mov ntawm lub load thiab ces disconnect lub hwj chim mov ntawm lub CPU.
Kev suav ntawm pulse ntim
Kev tswj ntawm tus nqi mem tes feem ntau yog siv rau lub kaum ntse ntse tswj, kev tswj kev deb, thiab kev tswj txoj haujlwm ntawm stepping motors thiab servo motors. Hauv qab no yog ib qho piv txwv ntawm stepper lub cev muaj zog los qhia txog txhua hom kev tswj
1, Lub kaum sab xis tswj ntawm stepper lub cev muaj zog. Ua ntej ntawm tag nrho cov, peb yuav tsum qhia kom meej lub stepper lub cev muaj zog cov ntsiab lus zoo, thiab ces txiav txim tag nrho cov pulses yuav tsum tau rau lub stepper lub cev muaj zog tig ib lub voj voog, xam lub "Angle feem pua = Teem lub kaum sab xis / 360 degree (ie, a voj voog)" "Lub kaum ntse ntse pulses=lub voj voog ntawm tag nrho cov pulses * Lub kaum sab xis feem pua: Lub kaum ntse ntse pulse=- lub voj voog tag nrho cov mem tes * (teeb lub kaum ntse ntse / 360 degree ).
2, stepper motor nrug tswj. Ua ntej txhais tag nrho cov pulses xav tau rau ib lub kiv puag ncig ntawm stepper lub cev muaj zog. Tom qab ntawd txiav txim siab txoj kab uas hla ntawm stepper lub cev muaj zog rau cov menyuam, suav qhov ncig ntawm cov menyuam los xam txhua tus mem tes khiav deb. Thaum kawg suav tus naj npawb ntawm cov pulses yuav tsum tau khiav los teem caij mus ncig. Cov mis yog: teem deb mem tes=teeb nrug / [( log txoj kab uas hla * 3.14) / ib lub voj voog ntawm tag nrho cov pulses]
3, stepper lub cev muaj zog txoj hauj lwm tswj yog lub kaum sab xis tswj thiab nyob deb tswj ntawm lub integrated saum toj no tsuas yog ib tug yooj yim tsom xam ntawm lub stepper lub cev muaj zog tswj, tej zaum yuav muaj kev tsis sib haum xeeb nrog rau qhov tseeb, rau kev siv ntawm cov npoj yaig nkaus xwb, servo lub cev muaj zog ua nrog tib stepper. lub cev muaj zog, tab sis coj mus rau hauv tus account lub servo lub cev muaj zog lub internal hluav taws xob iav piv nrog tib qhov kev pab cuam lub cev muaj zog txo piv.