Ukufaka ama-isolator wesiginali kumakhabethe wokulawula we-PLC

Emkhakheni we-industrial automation, amakhabethe wokulawula we-PLC (Programmable Logic Controller) adlala indima eqakathekileko, anesibopho sokwamukela amatshwayo avela eenzwani ezihlukahlukeneko nama-actuators, begodu afinyelele ukulawula okuqondileko kwenqubo yokukhiqiza ngokusebenzisa imisebenzi ye-logic yangaphakathi. Kodwana, ekusetjenzisweni okusebenzako, amakhabethe wokulawula we-PLC avamise ukuqalana neendawo ezihlukahlukeneko eziyinkimbinkimbi ze-elekthronikhi kanye nemiraro yokuphazamiseka kwesiginali, okungadosela ekutheni ihlelo lokulawula lingasebenzi kuhle, ukubhalelwa njalo, begodu kube yingozi ekuphepheni kwemitjhini nabasebenzi. Ngalokho-ke, ukungezelela isiginali ehlukilekoamakhabethe wokulawula we-PLC sele isisombululo esijayelekileko.

Imisebenzi eqakathekileko yama-isolator wesiginali ifaka hlangana ukukhandela ukudluliselwa kokuphazamiseka kwe-elekthronikhi, ukwehlisa ukwenzeka kokuhluleka kwehlelo, nokunikela ngokuzihlukanisa lokha nakunokuhluleka kwemitjhini endaweni, ukukhandela ukurhatjheka kwamaphutha kiyo yoke ihlelo lokulawula. Ngokutjhugulula nokutjhugulula amatshwayo amukelwa yi-PLC ngokusebenzisa amadivayisi we-semiconductor, bese uyawahlukanisa begodu uyawatjhugulula ngokusebenzisa amadivayisi wokuzwa we-optical nofana wamazibuthe, bese ekugcineni uwatjhugulula begodu uwatjhugulule abuyele esiginali yasekuthomeni nofana amasignali ahlukileko, ikambiso le iqinisekisa ukuzinza nokunemba kwesiginali, lokha nayivimbela ukulimala kwe-PLC begodu yehlisa umthelela wesignali ku-PLC, khulukhulu amatshwayo wokuhlangahlangana. Ukungezelela, ama-isolator wesiginali nawo angafinyelela ukutjhugulula isignali, njengokutjhugulula amasignali avela ekuxhumaneni kwe-PT10 abe masignali we-4-20mA bese uwafaka eenhlelweni ze-PLC, ukugwema ngepumelelo ukungqubuzana hlangana nemithombo kagesi namandla nokurarulula umraro wokuphazamiseka hlangana nama-loop nemitjhini.

Eensetjenzisweni ezithileko, njengomzila wokukhiqiza wefemu yensimbi, ukulinganisa nokulawula kufezwa nge-PLC, iinsetjenziswa zokuzenzakalela ezisendaweni, kanye nama-actuators asendaweni. I-PLC ifakwa ekhabetheni lokulawula eliqhele ngamamitha amanengi ukusuka endaweni (isebenza emazingeni womtjhiso wegumbi), begodu iinsetjenziswa zokuzenzakalela nofana ama-thermocouples avela endaweni akhipha amatshwayo ngokusebenzisa iintambo ukuya ekhabetheni lokulawula egumbini lokulawula. Ngalesisikhathi, isiginali engena ku-PLC kufanele ihlukaniswe begodu kungatlhogeka bona itjhugululwe, njengokuhlukanisa i-4-20mA begodu itjhugululwe ibe yi-0-5V ngaphambi kokungena ku-PLC. Imitjhini eqeda ukuhlukaniswa nokutjhugulula amatshwayo we-thermocouple ibizwa ngokuthi "i-thermocouple signal isolator" nofana "i-thermocouple temperature transmitter". Umsebenzi wayo omkhulu ufaka hlangana ukuhlukanisa isignali yokufaka neyokukhipha, kanye nokutjhugulula isignali yezinga le-mV engenako ukusuka ku-thermocouple ibe ziimpawu ezijayelekileko zebubulo (4-20mA, 0-5V, 0-10V).

Ngokurhunyeziweko, ukufaka ama-isolators wesignali kuqakathekile khulu ekwenzeni ngcono ukuthembeka kwamasistimu wokuzenzakalela webubulo, ukwehlisa amazinga wokuhluleka, ukuvikela imitjhini ye-PLC, nokwenza ngcono ikhwalithi yesiginali. Ngenye yeengcenye eziqakathekileko zokuqinisekisa ukusebenza okuzinzileko nokuthembekileko kwamahlelo wokulawula