Kodi mukusokonezedwa ndi mitundu yoyambira ndi yozama mu PLCs? Nayi kufotokoza kosavuta:
Kodi mukusokonezedwa ndi mitundu yoyambira ndi yozama mu PLCs? Nayi kufotokoza kosavuta:
Gwero vs Sink: Kwa ma circuit transistor, gwero (PNP) amatanthauza dera la IO lomwe limapereka pakali pano, pomwe sink (NPN) imatanthawuza kuti imatenga masiku ano.
Chitani (Zotulutsa Za digito):
Zotsatira za PNP (gwero) ndizofala mumndandanda wa Nokia 300/400 ndi European PLCs. Ali ndi gwero lamphamvu lamkati, kotero kuti zamakono zimayenda kudzera mu DO, kulola kuyendetsa molunjika popanda mphamvu yakunja.
Zotulutsa za NPN (sink) ndizofanana ndi za Japan, Taiwanese, Siemens 200, ndi ma PLC ambiri apakhomo. Amafuna mawaya akunja ku gwero lamphamvu la 24V, lomwe likuyenda kuchokera ku zida zakunja kupita ku gawo lotulutsa.
DI (Zolowetsa Pakompyuta):
Kusiyanitsa kumatengera komwe kumayendera komweko komwe kumagwirizana ndi terminal ya DI.
Nthawi zambiri, ngati DI's COM ilumikizidwa ku 24V ndipo kulowetsa kuli kovomerezeka pa 0V, komweko kumatuluka (gwero). Ngati COM ilumikizidwa ndi 0V ndipo kulowetsa kuli kovomerezeka pa 24V, kumayenda kwapano (kuzama).
Chidziwitso Chapadera pa ma PLC aku Japan: Ena (monga Mitsubishi) amatanthauzira DI kutengera mitundu yovomerezeka yotuluka. DI yomwe ingavomereze gwero DO imatchedwa "source input"; imodzi yomwe ingavomereze kumira DO ndi "kulowetsa kwakuya".
Kuphatikizika kwa DIDO: Source DI imatha kulumikizana ndi kumira DO, mosemphanitsa. Malumikizidwe amtundu womwewo wa DI/DO angafunike zokokera mmwamba kapena njira zina zopewera polarity.
Siemens PLCs:
Sink Logic: Signal ON pomwe pano ikuyenda kuchokera pagawo lolowera.
Source Logic: Signal ON pomwe pano ilowa mu terminal yolowera.
Ndi magetsi abwino, magetsi otsika (0V) pa malo olowetsamo panthawi ya "ON" akuwonetsa malingaliro ozama; mphamvu yamagetsi (yomwe nthawi zambiri imakhala 24V) imasonyeza gwero la gwero.
Zolowetsa zoyambira ndizovomerezeka kwambiri (zolowera pano), pomwe zolowera zozama ndizotsika (zotuluka pano).
Mitsubishi FX3U:
Gwero: Zomwe zikuchitika pano, ndi mawonekedwe a PNP transistor.
Sink: Mayendedwe apano, okhala ndi mawonekedwe a NPN transistor.
Zokonda Zachigawo:
Ma S7-200 PLC amatha kuthana ndi mitundu yonse ya kumira ndi gwero, pomwe ma S7-300 PLC nthawi zambiri amakhala gwero. Western Europe nthawi zambiri amagwiritsa ntchito mitundu yamagwero yokhala ndi ma switch a PNP pazolowetsa zapamwamba. Japan ndi South Korea amakonda mitundu yozama, pogwiritsa ntchito masiwichi a NPN pazolowetsa zotsika.
Zomwe zimatuluka ndi mitengo yabwino ya DC, zotulutsa zakuya ndi zoyipa. Siemens PLCs nthawi zambiri amakhala ndi zonse ziwiri, koma gwero ndilofala kwambiri. Ma Mitsubishi PLC amathandizira zolowetsa zonse ziwiri, koma kuzama kumakhala kofala kwambiri, kofanana ndi masiwichi oyandikira amtundu wa NPN.