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EM231 0-10V used with 4-20 mA transmitter

10/3/2013 1:41 PM	Rate (0)
fbaravalle Posts: 17 Rating: (1)	Hi everybody, I have a S7 200 with EM231, and it has configured 0-10v analog input channels. Is there a way to convert a 4-20 ma loop powered device for use with this configuration (input A+ A-)? I thought I could use 250 ohm or perhaps 500, but I am unsure. The others 3 inputs used 0-10 V devices. If possible, could you show me a circuit connection? Thank you! Francis.
fbaravalle Posts: 17 Rating: (1)
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This contribution was helpful to 1 thankful Users @MSKY

10/3/2013 3:07 PM	Rate (0)
BhaPraJ Posts: 519 Rating: (83)	It is preferable to use I to V converter. .
BhaPraJ Posts: 519 Rating: (83)
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10/3/2013 3:43 PM	Rate (0)
adam_ski Bronze Member Joined: 4/9/2010 Last visit: 7/4/2025 Posts: 236 Rating: (34)	I believe you could use a 500ohm resistor remembering that zero value at 4mA will result in 2V input. Noteif you use the CPU sensor power supply: This is the 24 VDC sensor power that is available after the internal relay coil power and 24 VDC comm port power requirements have been accounted for. Attachment 0-20mA_to_0-10V.jpg (354 Downloads)
	Last edited by: adam_ski at: 10/3/2013 4:12 PM
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10/3/2013 5:02 PM	Rate (0)
fbaravalle Posts: 17 Rating: (1)	Dear: thank you!. The circuit is working OK. Best regards. Francisco.-
fbaravalle Posts: 17 Rating: (1)
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10/3/2013 5:36 PM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, And to convert your 2-10V signal toa value to work with: How can you scale analog values with S7-200 in conjunction with CPU224XP and expansion modules EM 231, EM 232 and EM 235? Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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