5i25 7i77 5v Field Voltage

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30 Aug 2017 14:34 - 30 Aug 2017 14:34 #98217 by bevins
bevins created the topic: 5i25 7i77 5v Field Voltage
I know the docs say to use between 8-32 volts for field voltage. My friend insists on using 5vdc for field voltage despite the manual stating 8-32vdc.

What might one expect when using 5vdc instead of the required minimum 8vdc?

It is working so far with the 5vdc...... energizing relays and inputs.
Last Edit: 30 Aug 2017 14:34 by bevins.
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30 Aug 2017 14:47 #98219 by PCW
PCW replied the topic: 5i25 7i77 5v Field Voltage
5V will work for VFIELD but not for VIN (VIN must be 8 to 32V)

The disadvantage of 5V VFIELD is less noise immunity on inputs and somewhat
lower current rating on outputs
The following user(s) said Thank You: bevins
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30 Aug 2017 15:13 #98225 by bevins
bevins replied the topic: 5i25 7i77 5v Field Voltage

PCW wrote: 5V will work for VFIELD but not for VIN (VIN must be 8 to 32V)

The disadvantage of 5V VFIELD is less noise immunity on inputs and somewhat
lower current rating on outputs


OK great. Yeah I insisted on the 12vdc for the VIN, and we split using 5vdc for for field voltage only because he wanted to use his existing 5v relay boards....
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