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4-20mA with CPU224XP !

9/25/2011 10:29 AM	Rate (0)
Tomy Master Platinum Member Joined: 5/4/2009 Last visit: 1/21/2026 Posts: 916 Rating: (40)	Dear friends, Is it the right way that I use 500 Ohm resistor along with a 4-20mA signal to be able to deal with built in analog input of CPU224XP? If not please advice. Regards. Tomy
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9/25/2011 3:41 PM	Rate (1)
Greg_E Posts: 88 Rating: (2)	Hi Tomy, I had such issue, i don't remmember which resistor i used but it wasn't 500 ohm. Actually you can use any resistor you would like without exceeding the 0-10 voltage upon the Analog input. 500 ohm makes voltage between 2-10V you have just to make the right scaling with the raw data corresponding with your engineering units values. Good luck, Best Regards, Greg.
Greg_E Posts: 88 Rating: (2)
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This contribution was helpful to 1 thankful Users Tomy Master

9/26/2011 7:18 AM	Rate (1)
umencho Grandmaster Joined: 3/21/2006 Last visit: 1/22/2026 Posts: 10244 Rating: (1183)	Hello Tomy, To confirm Greg's answer http://support.automation.siemens.com/WW/view/en/25204813 When using a 4mA to 20mA sensor, you must convert the measured value accordingly. A sample program with explanations is available as Tip 38a in "Tips&Tricks S7-200" in Entry ID 1232912. Best regards, Hristo Mihalev
	Last edited by: UMENCHO at: 9/26/2011 7:20 AM
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