4/13/2020 3:38 PM | ||||||
Joined: 7/7/2010 Last visit: 8/22/2024 Posts: 15105 Rating:
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You need an RTD analog input module, or an RTD to voltage/current signal conditioner. If you only have one RTD signal, you might consider a signal board to accept the RTD signal.
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science guy |
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4/13/2020 3:45 PM | ||||||
Posts: 174 Rating:
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4/13/2020 3:50 PM | ||||||
Joined: 7/7/2010 Last visit: 8/22/2024 Posts: 15105 Rating:
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With a Siemens RTD analog input module or signal board, the hardware configuration telling the PLC how to interpret the RTD (by telling the PLC what type of RTD is attached) gives you the temperature with 1 or 2 decimal places directly. No conversions. If you use a signal conditioner, it can come into the plc as voltage or current and you will need to scale it in plc logic (using NORM_X and SCALE_X).
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science guy |
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4/13/2020 3:54 PM | ||||||
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yOU MEAN iF iGET AI support RTD and change AI device properties, whatever the value receive is temperature which can display on HMI. |
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4/13/2020 3:55 PM | |
Joined: 7/7/2010 Last visit: 8/22/2024 Posts: 15105 Rating:
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Exactly correct. You should download and review the S7-1200 System Manual when you are not sure how things work. It will help you very much with Siemens hardware and software. |
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4/13/2020 4:46 PM | |
Joined: 9/27/2006 Last visit: 8/23/2024 Posts: 12279 Rating:
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Hello jibemathew; One detail: The value you will read in the PLC, when using a RTD module, is a multiple of 10,0 of the actual temperatire read by the RTD. If you read 1250, your temperature is 125.0 C. If you read 523, your temperature is 52.3 C. This is valid when the temperature read is within the standard range accepted by the RTD module. If you exceed this limit, you get a reading 32767; if you undershoot, you will read -32768. you can use these values to trigger an alarm signals. See the attachment, from the S7-1200 System manual: https://support.industry.siemens.com/cs/ww/en/view/109772940 Hope this helps, |
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