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SB 1231 RTD has a problem

Created by: MinhPhong29 at: 12/4/2014 5:58 AM (10 Replies)

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12/4/2014 5:58 AM	Rate (0)
MinhPhong29 Posts: 30 Rating: (2)	Hi everybody, I have a problem now. When I connected Pt100 2-wire to signal board SB 1231 RTD, a red led on the SB and error led on CPU was flashing. I don't know why? Can anyone help me? Thanks! P/S: I'm sorry for my bad English Attachment pt100 and sb1231.jpg (504 Downloads)
MinhPhong29 Posts: 30 Rating: (2)
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12/4/2014 8:14 AM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 1/15/2025 Posts: 5697 Rating: (715)	Hello, Are you sure the connections are right? See picture attached for 2 wire connection. Regards, Marcjan Attachment 2_wire.jpg (463 Downloads)
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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12/4/2014 10:18 AM	Rate (0)
MinhPhong29 Posts: 30 Rating: (2)	Hello Marcja, Yes, I have checked my connection, it correctly as picture attached. One more thing, when I used online function to monitor, I saw an error "High limit exceeded" on Diagnostic and the value of PIW80 = 32768. Do you know why? Thank you! (Sorry Marcja, my English is not good, so do you understand? )
MinhPhong29 Posts: 30 Rating: (2)	Last edited by: MinhPhong29 at: 12/4/2014 10:20 AM
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12/4/2014 4:39 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 1/15/2025 Posts: 5697 Rating: (715)	Hello, Your English is good enough to understand your problem. Did you measure the resistance of your PT100? Should be about 107 Ohm at 20 degrees. 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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This contribution was helpful to 2 thankful Users William_B MinhPhong29

12/5/2014 4:46 AM	Rate (0)
MinhPhong29 Posts: 30 Rating: (2)	Hello Marcja, Thank you for replying me :) I have measured the resistance of PT100, It was approximately 110 Ohm at 26 degrees. So I think my sensor have no problem.
MinhPhong29 Posts: 30 Rating: (2)
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12/9/2014 10:05 AM	Rate (0)
MinhPhong29 Posts: 30 Rating: (2)	I fixed my problem. Thanks! :)
MinhPhong29 Posts: 30 Rating: (2)
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12/9/2014 3:58 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/23/2025 Posts: 15553 Rating: (2467)	MinhPhong29 I fixed my problem. Thanks! :) What was the problem? Your solution may help others - or even yourself in a few years if you forget about it.
	science guy
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This contribution was helpful to 1 thankful Users Marcjan

12/10/2014 12:01 PM	Rate (0)
MinhPhong29 Posts: 30 Rating: (2)	Hello, Firstly, I checked the connection and configuration, no problem. Then, I checked my sensor, It was ok. Finally, I tried with another SB => It worked
MinhPhong29 Posts: 30 Rating: (2)
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This contribution was helpful to 3 thankful Users Marcjan 0_Einstein Min_Moderator

12/23/2014 10:21 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/22/2025 Posts: 4396 Rating: (1464)	Hi, check if all devices (module and RTD) are really in the same ground potential (voltage). Even little voltage between the grounds could leave a channel destructions.
	Denilson Pegaia Siemens Industry Sector Technical Support
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12/25/2014 7:00 AM	Rate (0)
MinhPhong29 Posts: 30 Rating: (2)	Hi Pegaia, I resolved my problem :) Thank you ^^
MinhPhong29 Posts: 30 Rating: (2)
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