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Analog input module - current input

Created by: PilotPM at: 12/19/2011 8:26 AM (5 Replies)

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12/19/2011 8:26 AM	Rate (0)
PilotPM Posts: 23 Rating: (0)	Hi, I have analog input module 331-1KF02-0AB0. Module is configured as input current range 4-20mA. My problem is, when I measure input current 20mA, I read value somethink under 21000 instead 27648. I measured current by meter, so input is realy 20mA. Have you any idea why? Thanks Pilot
PilotPM Posts: 23 Rating: (0)
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12/19/2011 8:44 AM	Rate (0)
Ganes10 Platinum Member Joined: 8/31/2010 Last visit: 9/15/2024 Posts: 1521 Rating: (227)	I hope you have measured current in series only. The value pertaining to the reading you get is some where around 16mA. If you measure current in parallel you may have a difference in the physically read and module read value. Also hope your cable is shielded properly to ground. How about other values you get in between 4 - 20 mA?
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12/19/2011 8:45 AM	Rate (0)
Darius Platinum Expert Joined: 9/28/2005 Last visit: 8/27/2024 Posts: 2957 Rating: (242)	Hi, Really strange issue. Have no more ideas only to check those links http://support.automation.siemens.com/WW/view/en/23858437 http://support.automation.siemens.com/WW/view/en/23857901
	Best regards, Darius
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12/29/2011 10:41 AM	Rate (0)
PilotPM Posts: 23 Rating: (0)	Hi, yes its only series connection. And it does all channels. I proved the cables and I think, that everythink should be all right. But thanks for replay
PilotPM Posts: 23 Rating: (0)
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12/31/2011 8:42 PM	Rate (0)
Calazans Posts: 10 Rating: (0)	Well, if you're saying that the wire connection is ok, you should check your hardware configuration. Wich option are you using. 4 or 2 wires connection? And what connection did you do? But we can't forget the noise possibility.
Calazans Posts: 10 Rating: (0)
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1/9/2012 10:33 AM	Rate (0)
gfbemrah Posts: 6 Rating: (0)	i think you should check shield wire.maybe it has a problem.one more time try another cable.
gfbemrah Posts: 6 Rating: (0)
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