0-30v Analog Input - PLCS.net

mad4x4 · December 3rd, 2019, 09:41 AM

Any ideas on who to convert 0-30v to 4-20mA or 0-10v I know I can use a potential divider with a few resistors but need something that can be "Bought" and rail mounted rather than "made"

Need t get a 24v Battery condition signal into a PLC for monitoring over profibus. Only have spare 4-20mA analog inputs.

geniusintraining · December 3rd, 2019, 09:48 AM

Just a simple resistor would get your 30v to 10v, not sure of the size you would need but I go from 0-24vdc to 0-10vdc all the time with a resistor, the size depends on what you are connecting to, mine range from 75 ohm to 300k

mylespetro · December 3rd, 2019, 09:55 AM

Not sure if loop powering them would be possible in your situation, but maybe look into Acromag's TT238. Multiple range (+/- 75VDC range in your case) DC voltage input, 4-20mA output.

parky · December 3rd, 2019, 10:04 AM

Have a look at these:
https://www.spectra-displays.co.uk/s...gnal-converter

Aabeck · December 3rd, 2019, 10:06 AM

Go to this voltage divider calculator.

Need to split 30V into 20V & 10V, then watch the 0-10V side. Since it's only a signal only need to divide 1 watt or 0.01 amps.

jimtech67 · December 3rd, 2019, 10:52 AM

for those in the USA

https://www.omega.com/en-us/communic...15VAC-65V-4-20

Levi G · December 3rd, 2019, 11:19 AM

I have a Weidmuller 1481970000 here that would do just that. Weidmuller 1481970000

g.mccormick · December 3rd, 2019, 03:45 PM

Automation Direct has 0-50VDC in 4-20MA out
https://www.automationdirect.com/adc.../vdct050-42-24

mad4x4 · December 5th, 2019, 07:15 AM

Cheers got a solution

geniusintraining · December 5th, 2019, 07:50 AM

Quote:

Originally Posted by mad4x4

Cheers got a solution

What did you end up doing?

goghie · December 6th, 2019, 04:35 PM

Quote:

Originally Posted by geniusintraining

What did you end up doing?

Yes, feedbacks are really appreciated.

December 3rd, 2019, 09:41 AM	#1
mad4x4 Member Join Date: Mar 2009 Location: ST CYrus Posts: 49	0-30v Analog Input Any ideas on who to convert 0-30v to 4-20mA or 0-10v I know I can use a potential divider with a few resistors but need something that can be "Bought" and rail mounted rather than "made" Need t get a 24v Battery condition signal into a PLC for monitoring over profibus. Only have spare 4-20mA analog inputs.

December 3rd, 2019, 09:48 AM	#2
geniusintraining Lifetime Supporting Member + Moderator Join Date: Jun 2005 Location: SC Posts: 6,598	Just a simple resistor would get your 30v to 10v, not sure of the size you would need but I go from 0-24vdc to 0-10vdc all the time with a resistor, the size depends on what you are connecting to, mine range from 75 ohm to 300k __________________ www.PLCCable.com PLC Communication Cables, PLC Trainers, Fluke Meters, MicroLogix, ControlLogix, Siemens, Allen Bradley and more... all your automation needs... ((NEW)) After Market 1784-U2DHP Allen Bradley USB to DH+ and Gateways

December 3rd, 2019, 10:06 AM	#5
Aabeck Member Join Date: Feb 2013 Location: Detroit Posts: 1,514	Go to this voltage divider calculator. Need to split 30V into 20V & 10V, then watch the 0-10V side. Since it's only a signal only need to divide 1 watt or 0.01 amps. __________________ Never underestimate the quality of idiots that will be running your machines http://aabeck.com

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December 3rd, 2019, 09:55 AM	#3
mylespetro Supporting Member Join Date: Dec 2015 Location: NS Posts: 175	Not sure if loop powering them would be possible in your situation, but maybe look into Acromag's TT238. Multiple range (+/- 75VDC range in your case) DC voltage input, 4-20mA output.

December 3rd, 2019, 10:04 AM	#4
parky Member Join Date: Oct 2004 Location: Midlands Posts: 1,415	Have a look at these: https://www.spectra-displays.co.uk/s...gnal-converter

December 3rd, 2019, 10:52 AM	#6
jimtech67 Member Join Date: Jun 2002 Location: New Jersey Posts: 388	for those in the USA https://www.omega.com/en-us/communic...15VAC-65V-4-20

December 3rd, 2019, 11:19 AM	#7
Levi G Member Join Date: Sep 2015 Location: Alberta Posts: 76	I have a Weidmuller 1481970000 here that would do just that. Weidmuller 1481970000

December 3rd, 2019, 03:45 PM	#8
g.mccormick Lifetime Supporting Member Join Date: Jul 2012 Location: IN Posts: 659	Automation Direct has 0-50VDC in 4-20MA out https://www.automationdirect.com/adc.../vdct050-42-24

December 5th, 2019, 07:15 AM	#9
mad4x4 Member Join Date: Mar 2009 Location: ST CYrus Posts: 49	Cheers got a solution

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