Ukufaka ii-signal isolators kwiikhabhathi zolawulo ze-PLC

Kwicandelo le-automation yemizi-mveliso, iikhabhinethi zolawulo ze-PLC (Programmable Logic Controller) zidlala indima ebalulekileyo, zinoxanduva lokufumana imiqondiso evela kwiisensa ezahlukeneyo kunye nee-actuators, kunye nokufezekisa ulawulo oluchanekileyo lwenkqubo yemveliso ngokusebenzisa imisebenzi yangaphakathi ye-logic. Nangona kunjalo, kwizicelo ezisebenzayo, iikhabhinethi zolawulo ze-PLC zihlala zijongene neendawo ezahlukeneyo ze-electromagnetic ezintsonkothileyo kunye neengxaki zokuphazamiseka kwesignali, ezinokukhokelela ekungasebenzi kakuhle kwenkqubo yolawulo, ukusilela rhoqo, kwaye zide zibe yingozi kwizixhobo kunye nokhuseleko lwabasebenzi. Ke ngoko, ukongeza isignali ehlukanisiweyoIi-ators ukuya kwiikhabhathi zolawulo ze-PLC ziye zaba sisisombululo esiqhelekileyo.

Imisebenzi ephambili yezixhobo ezihlukanisa imiqondiso ibandakanya ukuthintela ukudluliselwa kokuphazamiseka kwe-electromagnetic, ukunciphisa ukwenzeka kokusilela kwenkqubo, kunye nokubonelela ngokwahlukana xa izixhobo zisilela kwindawo, ukuthintela ukusasazeka kweempazamo kwinkqubo yolawulo lonke. Ngokuguqula nokuguqula imiqondiso efunyenwe yi-PLC ngezixhobo ze-semiconductor, emva koko zihlukanise kwaye ziguqule kusetyenziswa izixhobo zokubona ezibonakalayo okanye ze-magnetic, kwaye ekugqibeleni ziguqule kwaye zibuyisele kwisignali yokuqala okanye imiqondiso eyahlukileyo, le nkqubo iqinisekisa uzinzo kunye nokuchaneka kwesignali, ngelixa ikwathintela umonakalo kwi-PLC kwaye inciphisa impembelelo yezibonakaliso kwindawo kwi-PLC, ngakumbi imiqondiso ye-clutter. Ukongeza, izixhobo ezihlukanisa imiqondiso nazo zinokufikelela ekuguqulweni kwesignali, njengokuguqula imiqondiso evela kuqhagamshelo lwe-PT10 ibe yimiqondiso ye-4-20mA kwaye zifakwe kwiinkqubo ze-PLC, ziphephe ngempumelelo iingxabano phakathi kombane kunye nemithombo yamandla kunye nokusombulula ingxaki yokuphazamiseka okudibeneyo phakathi kwee-loops kunye nezixhobo.

Kwizicelo ezithile, njengakwimigca yemveliso yesityalo sentsimbi, umlinganiselo kunye nolawulo lwenziwa nge-PLC, izixhobo zokuzenzekelayo ezikwindawo, kunye nee-actuators ezikwindawo. I-PLC ifakwa kwikhabhinethi yokulawula ekwiimitha ezininzi ukusuka kwindawo (isebenza kubushushu begumbi), kunye nezixhobo zokuzenzekelayo okanye ii-thermocouples ezivela kwimiqondiso yokukhupha indawo ngeengcingo ukuya kwikhabhinethi yokulawula kwigumbi lolawulo. Kule ndawo, isignali engena kwi-PLC kufuneka yahlulwe kwaye inokufuna ukuguqulwa, njengokwahlula i-4-20mA kunye nokuyiguqula ibe yi-0-5V ngaphambi kokungena kwi-PLC. Izixhobo ezigqibezela ukwahlulwa kunye nokuguqulwa kwemiqondiso ye-thermocouple zibizwa ngokuba yi-"thermocouple signal isolator" okanye "thermocouple temperature transmitter". Umsebenzi wayo ophambili uquka ukwahlukanisa isignali yokufaka kunye nesignali yokukhupha, kunye nokuguqula isignali yenqanaba le-mV yokungenisa kwi-thermocouple ibe yimiqondiso eqhelekileyo yemizi-mveliso (4-20mA, 0-5V, 0-10V).

Ngamafutshane, ukufaka ii-signal isolators kubaluleke kakhulu ekuphuculeni ukuthembeka kweenkqubo zokwenza izinto ngokuzenzekelayo kwimizi-mveliso, ukunciphisa amazinga okusilela, ukukhusela izixhobo ze-PLC, kunye nokuphucula umgangatho wesignali. Le yenye yezinto ezibalulekileyo ukuqinisekisa ukusebenza okuzinzileyo nokuthembekileyo kweenkqubo zolawulo.