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Analog input (AI2x12Bit) low current

Created by: SBiker at: 6/18/2013 9:16 PM (6 Replies)

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6/18/2013 9:16 PM	Rate (0)
SBiker Posts: 8 Rating: (0)	Hello. I have some problem with analog input module (6AG1 331-7KB02-2AB0). To the both channel 1 and channel 2 I've connected two pressure transmitters (2 wire, 4-20mA signal). The reading on the first channel seems to be ok (for 0 pressure I have 4 mA) and for higher pressures the reading is proper. On the second channel (ch 2) for 0 pressure the reading of current is about 1.9 mA so less than 4 mA. I've made some test with switching the cables, connecting both transmitters to the 1 ch and next 2 ch I've checked also the current loop if it's not disconnected somewhere. The test where positive for ch 1 but for ch 2 not. Is it mean that the second channel is damaged somehow and the only resolution is buy a new card? Best regards.
SBiker Posts: 8 Rating: (0)
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6/20/2013 10:02 AM	Rate (0)
AutoGen_259626 Posts: 26 Rating: (0)	try using 4 wire configuration. This happen many a time with 2 wire conf. Use 24VDC external to PT & take back other wire to AI +VE Terminal & use M point of external power for AI -VE terminal.
AutoGen_259626 Posts: 26 Rating: (0)	Last edited by: AutoGen_259626 at: 6/20/2013 10:03 AM
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6/20/2013 11:28 AM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi Check if you can give the second input to the third channel, Please check that.
	Jazz
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6/26/2013 8:21 PM	Rate (0)
RKM Posts: 93 Rating: (13)	Yes.. use 2nd input in first chanel and see iffirst channel isproperly getting the 4 mA of second input. and also try to connect second input to any other module .if for both cases if you get positive result then second chanel of your AI card is faulty.
RKM Posts: 93 Rating: (13)
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7/1/2013 7:56 AM	Rate (0)
SBiker Posts: 8 Rating: (0)	It's 2 Ch card so I can't check the third one. I've checked the first one with both p. transmitters and it works OK - the current value for 0 pressure is 4 mA on first ch for both transmitters. I've instaled the new 8 AI module for test and all ch. for both transmitters works perfect so guessing that the second ch. is in 2 ch module is dead.
SBiker Posts: 8 Rating: (0)	Last edited by: SBiker at: 7/1/2013 8:02 AM Last edited by: SBiker at: 7/1/2013 7:58 AM
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7/1/2013 10:13 AM	Rate (0)
viralpatel Silver Member Joined: 11/18/2010 Last visit: 8/5/2022 Posts: 523 Rating: (32)	hi Sbiker, As per your above testing i think you second channel is not working so your module is faulty. viral patel

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7/1/2013 11:12 AM	Rate (0)
Saggy Silver Member Joined: 11/8/2011 Last visit: 9/24/2024 Posts: 387 Rating: (43)	SBiker It's 2 Ch card so I can't check the third one. I've checked the first one with both p. transmitters and it works OK - the current value for 0 pressure is 4 mA on first ch for both transmitters. I've instaled the new 8 AI module for test and all ch. for both transmitters works perfect so guessing that the second ch. is in 2 ch module is dead. hi it seems your second channel faulty

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