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SM1231-RTD

Created by: nguyenvudtd at: 10/3/2012 5:44 PM (7 Replies)

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10/3/2012 5:44 PM	Rate (0)
nguyenvudtd Posts: 37 Rating: (0)	hello I AM USING MODULE SM1231 . IT USED READ VALUE RTD 2 WIRE , I READ MANUAL AND CONNECT WIRE . I USED CHANNEL 0 MODULE SM1231 . I READ PLC MEMORY IW96 . BUT IT DISPLAY VALUE IW96=-2025 . I HOPEpeople CAN HELP ME THANK VERY MUCH
nguyenvudtd Posts: 37 Rating: (0)
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10/3/2012 5:48 PM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, The temperature is displayed in 1/10 degree, so you have to convert it to real and devide by ten to see actual temperature 202,5 in your case is that correct value? If not tell us how exactly you conect the sensor. Regards, Marcjan
	Last edited by: Marcjan at: 10/3/2012 5:58 PM Last edited by: Marcjan at: 10/3/2012 5:56 PM oops corrected. Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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10/3/2012 6:16 PM	Rate (0)
nguyenvudtd Posts: 37 Rating: (0)	HELLO I CONNECT AS IMAGE . BUT PLC MEMORY IW96 = - 2025 .ITVALUE negative.SENSOR I USED TYPE WIRE 2 . THANK VERY MUCH . Attachment 1200rtd.JPG (402 Downloads)
nguyenvudtd Posts: 37 Rating: (0)
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10/3/2012 6:21 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/16/2026 Posts: 16379 Rating: (2522)	Maybe a wiring or device hardware configuration problem if the 202.5 degree is incorrect. CheckAppendix A.8.2 in S7-1200 System Manual, dated 04/2012 for wiring details. Check the device configuration in the project tree in portal. What about the other RTD inputs? Do they all read -202.5 degrees? If you jump across one of the other rtd inputs, does it provide reasonable results for the loopback? Post your results!
	Last edited by: huggy_d1 at: 10/3/2012 6:23 PM science guy
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10/3/2012 6:39 PM	Rate (0)
nguyenvudtd Posts: 37 Rating: (0)	hello but I was measured at room temperature . thank very much
nguyenvudtd Posts: 37 Rating: (0)
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10/3/2012 8:10 PM	Rate (0)
NathanT Posts: 10 Rating: (1)	nguyenvudtd HELLO I CONNECT AS IMAGE . BUT PLC MEMORY IW96 = - 2025 .ITVALUE negative.SENSOR I USED TYPE WIRE 2 . THANK VERY MUCH . This is the proper way to hook-up a 2wire configuration. (see Attachment) Suggest using Twisted Shielded pair 18-22 AWG wire. Also could you please provide information about your Sensor. Type/Coef. i.e. Pt100, α= 0.00385 Also provide information about your Configuration Setting for this channel. Thank You Nate Attachment C:\Documents and Settings\TrenNR\Desktop\RTD_2Wire.jpg (443 Downloads)
NathanT Posts: 10 Rating: (1)	Last edited by: NathanT at: 10/3/2012 8:15 PM
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10/4/2012 5:49 AM	Rate (0)
nguyenvudtd Posts: 37 Rating: (0)	hello I am using sensor as image Attachment DSC_0171.jpg (361 Downloads)
nguyenvudtd Posts: 37 Rating: (0)
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10/4/2012 3:40 PM	Rate (0)
NathanT Posts: 10 Rating: (1)	nguyenvudtd hello I am using sensor as image Thank you for the picture of your sensor. However, that does not helpwith knowing what type of sensor it is. (Pt100, Cu10, Ni120,Res150, etc.) The picture also does not show how you have it attached to the module. It would be nice to see a similar picture as shown inmy previous post. I also asked how the channel in question configured... (see Attachement) Attachment C:\Documents and Settings\TrenNR\Desktop\HW_Config.jpg (448 Downloads)
NathanT Posts: 10 Rating: (1)
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