2/7/2016 8:58 PM | |
Posts: 3 Rating:
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Hello,
I want to choose the right Logo plc with correct outputs for controlling heating devices like 3 point mixing valves. As I understand it would be a mistake to choose Logo with relay outputs, because controlling 3 point mixing valve requires a lot on-off cycles during operation and relays will fail after short time of period (or maybe this period is not so short?). Instead I should select Logo with transistor outputs and connect to them coupling relays? How about when I can sense 220Vac inputs with proper protection to plc? Can I also use coupling relays with 220Vac coils and connect 24Vdc to output terminals and provide to plc input? ------------------------------------------------------------------------------------------ |
Last edited by: VaidasJ at: 2/7/2016 8:58:56 PMLast edited by: Min_Moderator at: 2/8/2016 4:44:13 PMNew subject after splitting |
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2/8/2016 10:53 AM | |
Joined: 12/18/2014 Last visit: 9/1/2024 Posts: 33656 Rating:
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The way in which you want to bring 220VAC signals by coupling relays to the logo is right. The inputs of 24VDC Logo tolerated no 220VAC, it can be destroyed. AttachmentLOGO! 8 Soft manual 0BA8 2014_06 side 298.pdf (302 Downloads) |
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