Ukufaka izihlukanisi zesignali kumakhabhinethi okulawula e-PLC

Emkhakheni we-automation yezimboni, amakhabhinethi okulawula e-PLC (Programmable Logic Controller) adlala indima ebalulekile, anesibopho sokwamukela amasignali avela kuma-sensor nama-actuator ahlukahlukene, kanye nokufeza ukulawula okunembile kwenqubo yokukhiqiza ngokusebenzisa imisebenzi yangaphakathi ye-logic. Kodwa-ke, ekusetshenzisweni okungokoqobo, amakhabhinethi okulawula e-PLC avame ukubhekana nezimo ezahlukahlukene eziyinkimbinkimbi ze-electromagnetic kanye nezinkinga zokuphazamiseka kwesignali, okungaholela ekungasebenzi kahle kwesistimu yokulawula, ukwehluleka okuvamile, futhi kube yingozi ngisho nasekuphepheni kwemishini kanye nabasebenzi. Ngakho-ke, ukungeza isignali ehlukanisiweAma-ator kuya kumakhabhinethi okulawula e-PLC asephenduke ikhambi elivamile.

Imisebenzi eyinhloko yama-signal isolators ihlanganisa ukuvimbela ukudluliselwa kokuphazamiseka kwe-electromagnetic, ukunciphisa ukwenzeka kokwehluleka kwesistimu, kanye nokuhlinzeka ngokuhlukaniswa uma kwenzeka imishini ihluleka endaweni, ukuvimbela ukusabalala kwamaphutha ohlelweni lonke lokulawula. Ngokushintsha nokuguqula amasignali atholwe yi-PLC ngamadivayisi e-semiconductor, bese ewahlukanisa futhi ewaguqula kusetshenziswa amadivayisi okuzwa okukhanya noma okune-magnetic, bese ekugcineni ewaguqula futhi awabuyisele esignalini yokuqala noma amasignali ahlukene, le nqubo iqinisekisa ukuzinza nokunemba kwesignali, ngenkathi futhi ivimbela ukulimala kwe-PLC futhi inciphise umthelela wamasignali asendaweni ku-PLC, ikakhulukazi amasignali agcwele. Ngaphezu kwalokho, ama-signal isolators angaphinde afinyelele ukuguqulwa kwesignali, njengokuguqula amasignali avela ekuxhumaneni kwe-PT10 abe amasignali angu-4-20mA nokuwafaka ezinhlelweni ze-PLC, ukugwema ngempumelelo ukungqubuzana phakathi kukagesi nemithombo yamandla kanye nokuxazulula inkinga yokuphazamiseka okuhlangene phakathi kwama-loop nemishini.

Ezinhlelweni ezithile, njengasemugqeni wokukhiqiza wesitshalo sensimbi, ukulinganisa nokulawula kufezwa nge-PLC, izinsimbi zokwenza izinto ngokuzenzakalela endaweni, kanye nama-actuator asendaweni. I-PLC ifakwa kwikhabhinethi yokulawula eqhele ngamamitha ambalwa ukusuka endaweni (isebenza ekushiseni kwegumbi), kanye nezinsimbi zokwenza izinto ngokuzenzakalela noma ama-thermocouple avela kumasignali okukhipha indawo ngezintambo eziya kwikhabhinethi yokulawula egumbini lokulawula. Kuleli qophelo, isignali engena kwi-PLC kumele ihlukaniswe futhi kungadingeka iguqulwe, njengokuhlukanisa i-4-20mA nokuyiguqula ibe yi-0-5V ngaphambi kokungena kwi-PLC. Imishini eqeda ukuhlukaniswa nokuguqulwa kwezibonakaliso ze-thermocouple ibizwa ngokuthi "i-thermocouple signal isolator" noma "i-thermocouple temperature transmitter". Umsebenzi wayo oyinhloko uhlanganisa ukuhlukanisa isignali yokufaka kanye nesignali yokukhipha, kanye nokuguqula isignali yezinga le-mV yokufaka kusuka ku-thermocouple ibe yizibonakaliso zezimboni ezijwayelekile (4-20mA, 0-5V, 0-10V).

Ngamafuphi, ukufaka izihlukanisi zesiginali kubaluleke kakhulu ekuthuthukiseni ukuthembeka kwezinhlelo zokwenza izinto ngokuzenzakalela kwezimboni, ukunciphisa amazinga okuhluleka, ukuvikela imishini ye-PLC, kanye nokuthuthukisa ikhwalithi yesiginali. Kungenye yezingxenye ezibalulekile zokuqinisekisa ukusebenza okuzinzile nokuthembekile kwezinhlelo zokulawula.