Taw qhia rau Simatic S7-1200 CPU: Vim li cas nws tseem ceeb rau kev siv cov ntawv thov
TusSim7-1200 CPUyog qhov tseem ceeb ntawm kev lag luam automation, ua los ntawm Siemens - ib qho zoo- paub thiab ntseeg tau hom hauv kev lag luam. Nws yog tsim tawm tsuas yog rau me me thiab nruab nrab - qhov loj me ntawm cov txheej txheem automation, uas yog vim li cas ntau yam ua haujlwm cia siab rau nws. Txawm hais tias koj tau tswj hwm txoj siv tawv me me lossis cov kab ntau dua cov kab, lub simatic S7-1200 CPU tuaj yeem lis ntau txoj haujlwm. Nws tau nrov vim tias nws ntseeg tau, siv tau yooj yim, thiab muaj kev ua tau zoo yam tsis muaj kim heev. Rau ib tus neeg saib teeb tsa lossis txhim kho lawv cov kev siv tshuab ua, nkag siab lub simatic s7-1200 CPU yog ib qho yuav tsum tau ua. Nws ua haujlwm nrog cov software sib txawv thiab kho vajtse, ua kom haum rau ntau yam kev siv. Lub simatic s7-1200 CPU tseem muaj cov nta uas pab txuag lub zog, uas yog qhov zoo rau ob qho chaw lag luam thiab koj cov nqi lag luam.
Qhov tseem ceeb rau kev txiav txim siab ua ntej xaiv ib sim plaub s7-1200 CPU qauv
Ua ntej xaiv ib simatic s7-1200 CPU qauv, koj yuav tsum xav txog ntau yam tseem ceeb kom paub tseeb tias nws haum koj cov kev xav tau.
Xav Tau Ceev
Kev ua kom ceev qhia koj sai npaum li cas lub simatic s7 - 1200 CPU tuaj yeem lis cov haujlwm. Yog tias koj daim ntawv thov xav tau cov lus teb sai {3} Zoo li lub tshuab uas yuav tsum tau xaiv cov khoom nrawm-koj xav tau tus qauv nrog kev ua nrawm dua. Piv txwv li, yog tias koj tab tom khiav lub kaw lus yooj yim uas tsuas yog tig teeb rau thiab tawm hauv lub Hoobkas, qeeb qeeb yuav txaus. Tab sis rau lub system uas tswj ntau qhov chaw txav ib zaug, lub sijhawm sai sai sim sim s7-1200 CPU yog qhov tsim nyog. Koj tuaj yeem tshawb xyuas cov kev ua lag luam ceev ntawm txhua tus qauv ntawm Siemens 'lub vev xaib raug cai kom tau txais cov lej raug.
Cim xeeb yuav tsum tau
Nco yog lwm qhov loj. Lub simatic s7 - 1200 CPU muaj ob txoj kev nco: ua haujlwm nco thiab thau nco. Kev nco ua haujlwm yog siv thaum CPU yog khiav cov haujlwm, thiab thauj Memory Khw muag khoom thiab cov ntaub ntawv. Yog tias koj qhov kev zov me nyuam loj- nrog ntau cov kauj ruam lossis cov lus txib - koj yuav xav tau ib sim ua s7-1200 CPU nrog lub cim xeeb ntau. Rau cov kev pabcuam me me, zoo li kev tswj hwm yooj yim rau ib qho kev tso kua mis, tsawg dua tsis zoo. Piv txwv li, tus qauv nrog 100 KB ntawm lub cim xeeb ua haujlwm yuav ua haujlwm rau cov haujlwm yooj yim, tab sis tus qauv nrog 500 kb yuav zoo dua rau cov nyom ntau dua.
Kuv / o muaj peev xwm thiab nthuav dav
Kuv / O (cov lus tawm tswv yim / tso tawm) muaj peev xwm hais txog pes tsawg lub simatic s7 {} 12}} 12}} 12}} Yog tias koj tsuas muaj ob peb cov khoom siv los txuas, tus qauv nrog tsawg dua cov khoom siv I / O / O Cov ntsiab lus yog qhov zoo. Tab sis yog tias koj npaj yuav ntxiv ntau cov khoom siv tom qab, koj xav tau ib simatic s7-1200 CPU uas txhawb nqa cov qauv nthuav dav. Piv txwv li, lub tshuab bakery me me tsuas yog xav tau 6 lub tswv yim thiab 4 cov zis, tab sis lub Hoobkas loj dua nrog ntau cov tshuab yuav xav tau 20 lossis ntau cov kev tawm tswv yim thiab tawm.
Tus nqi thiab nyiaj txiag kev txwv
Tus nqi yog ib txwm muaj kev txiav txim siab rau cov lag luam, tshwj xeeb yog pib pib. Lub simatic s7 - 1200 CPU tus qauv muaj cov nqi sib txawv, nyob ntawm lawv cov nta. Cov nyiaj txiag - Tus phooj ywg simatic s7 - 1200} 1200 CPU qauv rau kev lag luam pib feem ntau yog ib qho yooj yim, zoo li 1211c. Yog tias koj muaj nyiaj txiag loj thiab xav tau lub zog ntxiv, koj tuaj yeem mus rau qib siab dua-kawg. Nws yog ib qho tseem ceeb kom sib npaug yam koj xav tau nrog dab tsi koj tuaj yeem them nyiaj-tsis them rau cov nta koj yuav tsis siv.
Muab piv rau cov npe nrov simatic S7-1200 CPU qauv: Nta thiab Siv Cov Ntaub Ntawv
Muaj ntau ntau tus neeg nyiam simatic s7-1200 CPU qauv, txhua tus nrog nws tus kheej cov nta thiab kev siv zoo tshaj plaws. Peb saib lawv ib leeg.
Sim7-1200 CPU 1211C: Qhov zoo tagnrho rau cov haujlwm yooj yim
Lub simatic s7 - 1200 CPU 1211c yog tus qauv theem pib, zoo meej rau cov haujlwm automation yooj yim. Nws muaj kev ua haujlwm nrawm ntawm 0.1 μS rau qee qhov kev ua haujlwm, uas tau nrawm txaus rau cov haujlwm me. Nws txoj kev ua haujlwm nco yog nyob ib ncig ntawm 100 kb, thiab thauj lub cim xeeb yog 4 MB. Nws los nrog 6 digital inputs thiab 4 digital outpect - zoo rau kev sib txuas ob peb sensors thiab cov menyuam yaus me. Rau cov teeb meem me me uas yuav tsum tswj cov tshuab yooj yim, xws li cov chaw nres tsheb ib zaug lossis lub tshuab ua kom me, lub simatic s7-1200 CPU 1211c yog qhov kev xaiv zoo. Qhov no haum nrog lub simatic s7-1200 CPU Xaiv cov qauv rau cov peev txheej me, raws li nws tsom rau kev xav tau qhov yooj yim uas tsis muaj nqi ntxiv.
Sim paub s7-1200 CPU 1212C: ntsuas kev ua tau zoo rau cov tshuab me me
Lub simatic s7-1200 CPU 1212C nce qib me ntsis ntawm 1211c. Nws muaj kev ua kom nrawm dua me ntsis (tseem nyob ib ncig 0.1 μS ib qho kev ua haujlwm me me) thiab kev nco ntau dua-150 KB. Lub nra thau yog 4 MB, tib yam li 1211c, tab sis nws muaj ntau I / O Cov ntsiab lus: 8 digital inputs thiab 6 digital options. Tus qauv no yog qhov zoo rau cov tshuab me uas xav tau ob peb kev sib txuas ntxiv. Piv txwv li, ib lub rooj cob qhia me me uas muaj ob lossis peb lub tshuab los tswj, zoo li lub tshuab uas sanding, yuav tau txais txiaj ntsig los ntawm simatic s7-1200 CPU 1212C. Nws tseem pheej yig tab sis muaj me ntsis hloov me ntsis ntau dua li tus qauv theem pib.
Sim7 {{- 1200 CPU 1214C: Xaiv muaj zog rau Mid-loj cov ntawv thov
Lub simatic s7 - 1200 CPU 1214C yog qhov kev xaiv nrov rau lub mid {8} kev siv} loj. Nws muaj kev ua nrawm dua ntawm 0.08 μS ib qho kev ua haujlwm me ntsis, uas txhais tau tias nws tuaj yeem ua tau ntau cov haujlwm ntxiv. Nws txoj kev ua haujlwm nco yog 300 kb, thiab thauj lub cim xeeb yog 8 MB-ntau rau cov khoos kas loj. Nws muaj 14 digital tawm thiab 10 digital outpections, yog li nws tuaj yeem txuas rau ntau cov khoom siv. Cov qauv no yog qhov zoo rau cov ntawv thov xws li HVAC (cua sov, cua, thiab cua txias) hauv cov vaj tse. Lub simatic s7-1200 CPU kev ua tau piv rau HVAC compison ntau feem ntau qib 1214C siab ntau vim tias nws tuaj yeem tswj hwm ntau lub thermostats, kiv cua tib lub sijhawm. Nws tseem txhawb nqa cov qauv nthuav dav, yog li koj tuaj yeem ntxiv ntau dua I / O yog tias xav tau tom qab.
Sim7 {- 1200 CPU 1215C thiab 1217C: Kev Ua Haujlwm Siab Rau Cov Haujlwm nyuaj
Lub simatic s7 - 1200 CPU 1215C thiab 1217c yog cov qauv siab tshaj plaws. Lub 1215c muaj kev ua haujlwm nrawm ntawm 0.06 μ per Ib qho kev ua haujlwm me me, 500 kb ntawm kev ua haujlwm nco, thiab 16 mB ntawm kev teeb lub cim xeeb. Nws muaj 14 digital tawm thiab 10 digital outpections, ntxiv rau 2 analog cov tswv yim thiab 2 analog outpections. Lub 1217c tseem muaj zog tshaj: 0.04 μ per operation operation operation operation,, 1 MB ntawm kev ua haujlwm nco, thiab 14 cov kev tawm tswv yim digital, 4 analog inputions, thiab 2 analog outpections. Cov qauv no yog rau cov haujlwm nyuaj, xws li tswj tau cov kab ntau lawm hauv cov chaw tsim khoom tsheb. Lawv tuaj yeem coj ntau lub tshuab, khaws cov ntaub ntawv hauv lub sijhawm tiag tiag, thiab sib txuas lus nrog lwm cov tshuab yooj yim. Yog tias koj daim ntawv thov xav tau ntau cov kev ua haujlwm ntau zog thiab cov ntaub ntawv cia, 1215C lossis 1217C simatic s7-1200 CPU yog txoj kev mus.
Tiag {- Lub Ntiaj Teb Daim Ntawv Thov: uas simatic S7-1200 CPU haum koj kev lag luam?
Cov kev lag luam sib txawv nyias muaj nyias cov kev xav tau, yog li txoj cai simatic s7-1200 CPU qauv sib txawv. Cia peb saib ib co kev lag luam ib txwm muaj thiab lawv cov haum zoo tshaj plaws.
Kev Lag Luam Ntim: Xaiv txoj cai Simecatic S7-1200 CPU
Lub ntim kev lag luam feem ntau xav tau cov tshuab uas muaj peev xwm qhwv, foob, thiab cov khoom siv daim ntawv lo sai. Yuav ua li cas xaiv simatic s7 - 1200 cpu rau ntim tshuab? Rau cov kab ntim me me {{3} Zoo li ib lub tshuab uas qhwv khaub noom khaub noom- lub simatic s7-1200 CPU 1212C tau ua haujlwm zoo. Nws tuaj yeem ua cov tswj kav cov txheej txheem rau kev qhwv thiab cov kauj ruam sib khi. Rau cov kab ntim loj loj nrog ntau cov tshuab, zoo li txoj kab uas ntim cov hwj, thiab cov ntawv sau lawv, cov ntawv sim, cov ntawv sim, CPU 1214C zoo dua. Nws muaj txaus kuv / o cov ntsiab lus los txuas tag nrho cov sensors thiab motors, thiab nws cov kev nrawm nrawm khaws cov kab khiav kom haum. Rau cov ntawv ntim cov tsheb ceev uas ua ntau pua cov khoom hauv ib feeb, 1215c lossis 1217c simatic s7-1200 CPU yog qhov zoo tagnrho.
Khoom Noj Khoom Haus thiab Dej Haus: Simatic S7-1200 CPU rau kev siv tshuab huv
Cov zaub mov thiab dej haus cov kev lag luam xav tau automation uas yooj yim los ntxuav thiab tuaj yeem siv tau kub thiab tswj qhov siab. Lub simatic s7 {- 1200 CPU cov qauv yog qhov zoo nyob ntawm no vim tias lawv tuaj yeem ua haujlwm nyob rau hauv cov dej num tsis muaj dej (xws li cov dej num. Rau lub hauv paus me me uas tswj qhov cub thiab tov, 1211c simatic s7-1200 CPU yog txaus. Nws tuaj yeem tswj cov qhov cub kub thiab tov khoom kom ceev. Rau cov nruab nrab-qhov loj me uas cov tshuaj txhuam hniav uas pasteurizes thiab nyob twj ywm, lub 1214c zoo dua. Nws tuaj yeem tswj cov pasteurization kub (siv analog cov tswv yim los ntawm cov thermometers) thiab lub tshuab ntim tshuab. Txog cov khoom noj dej haus loj uas cov kua mis dej qab zib los yog kua txiv, tus 1217c simatic s7-1200 CPU yog xav tau los daws cov kev kub ceev thiab ntau kauj ruam.
Cov Cheebtsam Automotive: Siab - ceev simatic s7-1200 CPU qauv
Lub Automotive Cheebtsam kev lag luam ua rau cov chaw zoo li bolts, zog, thiab cov iav, uas xav tau meej thiab kev tsim qauv nrawm. Qhov kev lag luam no xav tau siab - ceev simatic s7-1200 CPU qauv. Rau lub khw muag khoom me me uas ua rau cov hlua khi yooj yim, 1214C tej zaum yuav ua haujlwm, tab sis feem ntau cov khoom siv tsheb feem yuav tsum tau 1215c lossis 1217c. Cov qauv no tuaj yeem ua rau lub tshuab ceev ceev ntawm cov tshuab (zoo li kev sib ntaus sib zog uas sib sau ua ke) thiab sau cov ntaub ntawv ntawm kev tsim khoom. The 1217C's large memory is useful for storing data on each part, so you can track if a part meets quality standards. Lub simatic s7-1200 CPU kev ua nrawm nrawm uas ruaj khov caj npab txav kom raug thiab txo cov sijhawm ntau dua.
Kev tsim kho cov tshuab: lub zog -}} txuag simatic s7-1200 CPU kev xaiv
Kev siv tshuab ua lag luam suav nrog cov teeb pom kev zoo, HVAC, thiab kev nyab xeeb hauv chaw ua haujlwm, tsev kawm ntawv, lossis khw. Lub simatic s7 {- 1200 CPU yog zog-}}}}}}} Rau ib qho chaw ua haujlwm me me nrog cov hishing hvac thiab teeb pom kev zoo, tus 1211c simatic s7-1200 CPU yog txaus. Nws tuaj yeem tig teeb rau / tawm raws cov lus tsa suab thiab kho tus mob HVAC. Rau lub tsev kawm nruab nrab nrog ntau chav kawm thiab chaw dhia ua si, 1214c zoo dua. Nws tuaj yeem tswj hwm HVAC hauv txhua chav kawm (siv ntau lub thermostats) thiab tswj cov koob yees duab kev ruaj ntseg. Rau lub khw loj nrog ntau lub khw, teeb, thiab escalators, lub 1215c lossis 1217c simatic s7-1200 CPU xav tau. Nws tuaj yeem lis txhua lub tshuab sib txawv thiab txawm txuas mus rau ib lub chaw tswj hwm nruab nrab rau tus thawj tswj kav.
Cov kev xaiv nthuav dav: maxizing koj simatic s7-1200 CPU lub peev xwm
Txawm hais tias koj xaiv ib simatic s7-1200 CPU qauv nrog cov cim yooj yim, koj tuaj yeem nthuav nws lub peev xwm nrog cov qauv. Qhov no tseem ceeb yog tias koj lub lag luam loj hlob thiab koj xav tau haujlwm ntau dua.
Ntxiv i / o modules rau simatic s7-1200 cpu
Yog tias koj simatic s7 - 1200 CPU tsis muaj txaus ua- hauv i / o cov ntsiab lus, koj tuaj yeem ntxiv i / o modules. Cov qauv no tuaj nyob rau hauv ntau hom: Digital I / O (rau sensors thiab motors) thiab analog I / O (rau cov ntsuas pa, thiab lwm yam). Piv txwv li, yog tias koj muaj 1211c simatic s7-1200 CPU nrog 6 cov kev tawm tswv yim thiab 4 cov zis, koj yuav muaj 14 inputions, koj yuav muaj tag nrho cov zis. Qhov no yog qhov zoo rau simatic s7-1200 CPU kev tsim khoom lag luam-kev tsim cov kab-yog tias koj tuaj yeem ntxiv ib qho I / O Module es tsis txhob yuav tag nrho CPU. Siemens ua tshaj I / O modules uas yooj yim txuas rau lub simatic s7-1200 CPU.
Kev sib txuas lus modules rau simatic s7-1200 cpu
Kev sib txuas lus modules cia koj simatic s7 {}} 1200 CPU tham nrog lwm cov khoom siv, xws li khoos phis tawj, ntsiav tshuaj, lossis lwm yam CPUs. Piv txwv li, kev sib txuas lus sib txuas lus tau qhia txog CPU txuas rau lub Hoobkas lub Hoobkas loj heev, yog li koj tuaj yeem saib xyuas lub system los ntawm koj lub chaw haujlwm. Wi-nkaus module cia koj tswj lub CPU siv cov ntsiav tshuaj rau ntawm lub tsev kawm ntawv pem teb. Cov qauv no yog qhov muaj txiaj ntsig yog tias koj xav kom rov kuaj seb koj lub tshuab puas tau khiav lossis hloov mus rau qhov kev pab cuam tsis tau nyob ib sab ntawm CPU. Txhua zaus simatic s7-1200 CPU qauv txhawb kev sib txuas lus, yog li koj tuaj yeem ntxiv lawv txhua lub sijhawm.
TSHWJ XEEB YAUG UA HAUJ LWM MODULES rau Cov Haujlwm Ua Haujlwm
TSHWJ XEEB MODULES MODULES NTXIV Ntxiv cov yam ntxwv rau koj simatic s7-1200 CPU. Piv txwv li, lub txee module tuaj yeem suav tau ntau npaum li cas cov khoom dhau ib qho sensor (pab tau rau kev taug qab cov lej tsim khoom). Ib qho kev ua haujlwm ua qauv pab tswj cov tshuab uas txav mus rau cov haujlwm tshwj xeeb, zoo li caj npab uas tsis loj uas cov chaw hauv ib lub thawv. Ib qho kub tswj cov qauv kuj tuaj yeem tswj hwm ntau qhov ncu lossis cua sov nrog lub siab ntsuas. Cov qauv no yog cov zoo meej rau cov lag luam uas yuav tsum tau ua ntau dua li kev tswj hwm. Piv txwv li, lub Hoobkas uas ua rau kev cai cov khoom yuav siv tus qauv kev ua haujlwm nrog lawv 1214C simatic s7-1200 CPU kom ua tau txhua qhov yog.
Cov lus qhia rau kev yuav khoom thiab txhim kho koj simatic s7-1200 cpu
Kev yuav thiab txhim kho lub simatic s7-1200 CPU kom raug yog qhov tseem ceeb kom tau txais ntau tshaj plaws ntawm nws. Nov yog qee cov lus qhia muaj txiaj ntsig.
Qhov twg yuav yuav qhabreit simatic s7-1200 CPU qauv
Txhawm rau kom koj tau txais qhov tiag, siab - zoo simatic s7 {}} 12}} 12}} 12 4}} 12}} 12}} Koj tuaj yeem pom cov npe ntawm cov neeg xa khoom tau cai tso cai ntawm Siemens 'lub vev xaib official. Tsis txhob yuav los ntawm tsis paub online muag-muag-cpus kuj yuav tsis ua haujlwm kom zoo, tawg yooj yim, lossis txawm puas tsuaj rau koj lwm yam khoom siv. Tso cai cov neeg xa khoom tseem muaj kev txhawb nqa: yog tias koj muaj lus nug txog cov qauv twg los yuav, lawv tuaj yeem pab tau. Tej zaum lawv yuav muab cov kev lav ntawv, yog li koj sim ua ib qho teeb meem nyob rau qee lub sijhawm, koj tuaj yeem tau txais nws lossis hloov dawb.
Cov Kauj Ruam Yooj Yim rau Simatic S7-1200 CPU
Txhim kho lub simatic s7 - 1200 CPU tsis nyuaj dhau lawm, tab sis koj yuav tsum ua raws cov qib kom zoo. Ua ntej, tua tag nrho lub zog rau thaj tsam uas koj yuav nruab CPU hauv - kev nyab xeeb ua ntej! Tom qab ntawd, mount lub CPU ntawm lub tsheb ciav hlau (tus hlau txuas hlau siv rau cov cuab yeej siv khoom) hauv qhov chaw qhuav, txias. Nco ntsoov tias nws tsis nyob ze dej, chaw ua cua sov, lossis thaj chaw plua plav. Tom ntej no, txuas lub hwj huam cable - Mus xyuas qhov voltage (120V lossis 240V) kom paub tseeb tias nws phim koj lub Hoobkas lub zog. Tom qab ntawd, txuas cov I / o li (sensors, motors) mus rau CPU's built-in terminals. Yog tias koj tau ntxiv cov qauv nthuav dav, txuas rau CPU siv cov cable muab. Thaum kawg, tig lub zog thiab sim lub system kom paub tseeb tias txhua yam ua haujlwm. Yog tias koj tsis paub meej, koj tuaj yeem ntiav tus kws tshaj lij lossis tiv toj Siemens 'kev txhawb nqa.
Kev daws teeb meem ib txwm sim ua simatic s7-1200 CPU teeb meem
Txawm hais tias nrog ib tug zoo simatic s7 - 1200 CPU, koj yuav khiav mus rau cov teeb meem me. Nov yog qee qhov teeb meem tshwm sim thiab yuav kho lawv li cas. Yog tias CPU tsis tig mus, kos lub hwj huam cable - Nyeem tseeb tias nws tau ntsaws rau hauv kom nruj thiab lub zog ua haujlwm tau ua haujlwm. Yog tias I / o Li Cas (zoo li lub cev muaj zog) tsis ua haujlwm, xyuas cov xaim ntawm lub cuab yeej thiab cpu {{}} cov xov hlau yog qhov tshwm sim ib txwm muaj. Yog tias CPU khiav qeeb, kuaj yog tias qhov kev zov me nyuam loj dhau rau qhov nco dhau qhov kev pab cuam lossis hloov kho tus qauv nrog lub cim xeeb ntau dua. Yog tias koj tsis tuaj yeem txuas lub CPU rau lub khoos phis tawm, tshuaj xyuas kev sib txuas lus cable lossis module -}}}}}} Nyeem tseeb thiab txuas tau kom raug. Yog tias koj tsis tuaj yeem kho cov teeb meem, hu rau Siemens 'Kev Txhawb Nqa - Lawv muaj cov kws paub uas paub lub simatic S7-1200 CPU zoo thiab tuaj yeem pab tau.
Xaus: Nrhiav koj cov lus qhia zoo tshaj plaws S7-1200 CPU qauv
Xaiv txoj caiSim7-1200 CPUQauv yog nyob ntawm koj daim ntawv thov cov kev xav tau {{0} Kev ua ceev, nco, thiab muaj peev xwm siv nyiaj. Lub simatic s7 {{- 1200 CPU 1211c yog qhov zoo rau cov haujlwm yooj yim hauv cov khoom me me lossis khw. Lub 1212C muaj kev ua tau zoo rau cov tshuab me me. Lub 1214C muaj zog txaus rau nruab nrab- loj daim ntawv thov zoo li cov kab mob hVAC lossis nruab nrab ntim cov kab. Lub 1215C thiab 1217c yog qhov siab-} Kev ua tau zoo qauv rau cov haujlwm nyuaj hauv cov chaw loj. Nco ntsoov xav txog koj kev lag luam khoom siv, khoom noj thiab dej haus, tsheb, thiab kev tsim kho tsev, txhua yam muaj kev xav tau sib txawv. Koj tseem tuaj yeem nthuav koj simatic s7-1200 CPU nrog I / O, kev sib txuas lus, lossis tshwj xeeb cov haujlwm muaj kev loj hlob. Nco ntsoov yuav los ntawm cov neeg xa khoom tau tso cai thiab ua raws cov kauj ruam kom zoo kom koj lub cev khiav zoo. Nrog txoj cai simatic s7-1200 CPU, koj cov kev siv tshuab ua yuav ntseeg tau, muaj txiaj ntsig zoo, thiab npaj txhij los lis koj cov kev lag luam xav tau.
