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connecting thermocouple to SIEMENS AI cards
Created by: hdhosseini at: 9/21/2010 10:02 AM (2 Replies)
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| 9/21/2010 10:32 AM | |
Joined: 10/7/2005 Last visit: 9/13/2024 Posts: 3020 Rating:
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Hello hdhosseini the only way to fully avoid the creation of a cold junction in a field termination box is to use wires that are made from the same material as the thermocouple (and use internal compensation for the AI card which is now your "cold junction"). If the above is not feasible (i.e. youmust have copper cable from the AI card to the field terminal of the thermocouple), you can opt for an external compensation with a compensation box. All of the above is quite well explained in the documents below and Wikipedia hasalso general good thermocouple background info (see HERE): SIMATIC S7-300 Module data (see chapter 4.6) SM331; AI 8 x 12 Bit Getting Started part 3: Thermocouples I hope this helps |
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