Kurangiza icyuho: Ibyingenzi byingenzi bya PLC Itumanaho ryubumenyi kubanyamashanyarazi
Kurandura icyuho: Ibyingenzi bya PLC Serial Itumanaho Ubumenyi bwabakozi b'amashanyarazi
Ibyingenzi byitumanaho
Itumanaho ryuruhererekane ni protocole isanzwe kubikoresho - to - guhanahana amakuru. Bitandukanye na USB, mudasobwa nyinshi zifite ibyapa bibiri bya RS232 - bishingiye ku byambu. Ibyambu bikurikirana nabyo bikoreshwa cyane mubikoresho hamwe namakuru ya kure - ibikoresho byo kugura.
Ibyingenzi Byibanze byitumanaho
Kugirango itumanaho ryiza, ibipimo bikurikira bigomba guhuza ibyambu:
Igipimo cya Baud: Gupima amakuru - umuvuduko wo kohereza muri bits kumasegonda. Kurugero, 300 baud ihwanye na 300 bits kumasegonda. Igipimo cya Baud kigira ingaruka kuburyo butaziguye kumurongo wamakuru. Igipimo kinini cya baud, cyoroshya igihe gito - intera, ndende - itumanaho ryihuta, biragereranijwe bihuza intera yoherejwe.
Bits:Uhagararire amakuru nyayo mu kohereza. Indangagaciro zisanzwe ni 5, 7, cyangwa 8 bits. Kurugero, ASCII isanzwe ikoresha bits 7, mugihe yaguye ASCII ikoresha 8. Guhitamo biterwa namakuru yihariye - ibisabwa byo kohereza.
Hagarika Bits:Shyira iherezo ryamakuru apaki, mubisanzwe ufite agaciro ka 1, 1.5, cyangwa 2 bits. Bafasha ibikoresho guhuza amasaha mugihe cyitumanaho. Guhagarika byinshi byongera kwihanganira isaha - itandukaniro ryigihe ariko kugabanya amakuru - igipimo cyo kohereza.
Parite Bit:Ikosa ryoroshye - kugenzura uburyo. Amahitamo arimo ndetse, adasanzwe, muremure, hasi, cyangwa ntayo. Ndetse kandi bidasanzwe uburinganire bwashyizeho uburinganire kugirango harebwe umubare cyangwa udasanzwe wa logique yo hejuru murwego rwoherejwe. Uburinganire buringaniye kandi buke gusa shyira bito kuri logique yo hejuru cyangwa hasi, yemerera kwakira ibikoresho kugirango hamenyekane itumanaho rishobora gutumanaho cyangwa desynchronisation.
Ihuriro rusange rya PLC
RS - 232:RS - 232 isanzwe kuri IBM - PC hamwe na sisitemu ihuje. Ifasha porogaramu zitandukanye nko guhuza imbeba, printer, modem, nibikoresho byinganda. Mugihe RS - 232 ituma ingingo - kuri - itumanaho hagati yicyambu cya PC n'ibikoresho, intera ntarengwa yohereza ni metero 50.
RS - 422:RS - 422, ikoreshwa muri mudasobwa ya Apple Macintosh, ikoresha ibimenyetso bitandukanye. Bitandukanye na RS - 232 imwe - yarangiye - yerekana ibimenyetso, RS - 422 itandukanya ikoresha imirongo ibiri yo kohereza no kwakira ibimenyetso. Ibi byongera ubudahangarwa bw urusaku kandi bikagura intera yoherejwe, bigatuma bikwiranye ninganda.
RS - 485:RS - 485 itezimbere kuri RS - 422 mugushigikira ibikoresho bigera kuri 32 no gusobanura ibiranga amashanyarazi kuri ntarengwa - igikoresho - kubara ibintu kugirango hamenyekane ingufu za signal zihagije. Iremera gushiraho imiyoboro yibikoresho ukoresheje icyambu kimwe RS - 422. Hamwe n urusaku rukomeye - ubudahangarwa hamwe nubufasha bwinshi bwibikoresho, RS - 485 nibyiza mubikorwa byinganda nko kubaka imiyoboro yagabanijwe ihujwe na PC, amakuru - abagenzuzi bakusanya, HMIs, hamwe nubundi buryo bukora. RS - 485 ni superset ya RS - 422, ituma igenzura ibikoresho byose RS - 422 bifite intera yoherejwe irenga metero 4000.