PLUS+1 User Forum
PLUS+1 Hardware => Controllers => Topic started by: Lukey on February 15, 2024, 02:52:39 AM
-
I'm trying to use the smallest size possible controller, therefor id like to use a 5v AnIn pin as a DigIn with 24vdc input. from the switch
Is it as simple as using a resistor to drop the 24vdc down to 5vdc?
Anyone done this before and can advise what size resistor they use?
*EDIT FYI, I do not want to use the 5+ from the controller or use a relay to switch the 5+.
The application requires it to be compact and simple.
-
Which controller are you using? Which input pin?
It would be worth checking the ratings for the input you are using as there is a good possibility it will be rated to more the 24V. This can be found in the Controller Family Technical Information document for the controller family you are using.
-
11130915 / MC012-110, pin 5
-
This is the document for the MC0xx-1xx family
https://assets.danfoss.com/documents/206067/BC152986484529en-000701.pdf (https://assets.danfoss.com/documents/206067/BC152986484529en-000701.pdf)
For some reason the input and output specifications are in a section with the heading CAN.
-
Thank you acmall.
Yes odd that the heading is CAN
There is mention Middle range and High range, nothing about Low range.
I have only seen the range selection on the multifunction inputs, so I'm not sure about this information.
Overall it does mention max of 36v ???
I'm not convinced.
-
You can use C1p05 without a problem. The only thing is that if you input 24V it will only read maximum 5V on the input.
Make a simple logic to use this voltage as a digital input. f.ex. greater than 3V "on", and less than 2V "off"
-
I am not sure , but I think c1p05 at a MC024 controller maximum allowes 25V. All other inputs 36V.
Perhaps you ask helpdesk?
-
Thanks all,
Yes I will use a comparison block to simulate a DigIn on pin.
My system is a 24VDC regulated switch mode power supply so I don't expect to see anything greater.
According to the hardware manual AnIn pins rated for 36V
-
I am not sure , but I think c1p05 at a MC024 controller maximum allowes 25V. All other inputs 36V.
I think the 25V limit on C1P05 is a difference between the MC0xx-0xx controllers and the MC0xx-1xx versions.
-
Yes, thanks, indeed.
You are right!