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S7-1200 SM 1234, 4AI/2AO module, 0-20mA Input problem

Created by: sando at: 7/1/2015 8:10 AM (4 Replies)

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7/1/2015 8:10 AM	Rate (0)
sando Posts: 14 Rating: (3)	Greetings, I have a problem with S7-1200 SM 1234, 4AI/2AO module, i did all the required configuration on TIA Portal V12(adding the module to the rack, channel setting to 0-20mA, wiring and so on). But the problem is that all input channels read only (0001,0002,FFFF) values continuously (check attached pic)even though channel one is connected to pressure sensor (4-20mA) using external 24VDC PS other than PM 1207; and other channels are shorted. I tested the sensor connection by AVO meter mA input and it gives normal reading, so what do i miss? Notice: i tried this with both 6ES7 234-4HE30-0XB0 and 6ES7 234-4HE32-0XB0 but same problem occurred. My CPU: 6ES7 124-1AG31-0XB0 V3.0 Thanks Attachment AIO.png (302 Downloads)
sando Posts: 14 Rating: (3)	Last edited by: sando at: 7/1/2015 8:13:13 AM
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7/1/2015 4:05 PM	Rate (1)
BryanG2001 Posts: 113 Rating: (22)	So just to confirm that you have connected the AVO and there is a current flowing, but it isn't showing on the analogue unit. The most likely thing is a wiring problem, check your connections to the analogue unit, make sure that you haven't got the top and bottom rows of the terminals crossed. Then make sure that you have power to the analogue unit. Then use online and diagnostics to make sure that there are no errors. Finally make sure you have switched off the underflow diagnostics for the channel.
BryanG2001 Posts: 113 Rating: (22)
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This contribution was helpful to 2 thankful Users 0_Einstein sando

8/20/2015 5:26 PM	Rate (0)
sando Posts: 14 Rating: (3)	Hi, Thanks Brayan for reply., The problem that i used different power supply for the AI channels than the power supply of the Main module . BR
sando Posts: 14 Rating: (3)
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8/22/2015 10:19 AM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (153)	sando Hi, Thanks Brayan for reply., The problem that i used different power supply for the AI channels than the power supply of the Main module . BR This is a smart move, however you need to connect the minus wire.

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4/22/2016 2:11 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by Herbid68 is split to a separate thread with the subject Analog Input evaluation. Best regards Min_Moderator

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