12/29/2021 5:50 PM | |
Joined: 12/19/2021 Last visit: 1/9/2022 Posts: 19 Rating: (0) |
Hi, I try to program a temperature controll loop with Siemens Logo. I will use two PT100 Sensor and calculate the difference with a Mathemical Instruction. I do want to keep the difference of 5°C as the setpoint value and controlling a 3 way linear valve by using a PI controller and a analogue output. If I set Tin greater by 5°C compared to Tout, Math Instruction shows the correct difference of 50 (5°C) but what I do not understand why does the PV input not showing the correct value on the Graph of 50 but only a negative value? Pv increases only reaching the Sp when incresing deltaT by 400 instead of 50? I'm missing something. Thank you for your help AttachmentPiTempLoop.pdf (696 Downloads) |
12/29/2021 5:55 PM | |
Joined: 12/18/2014 Last visit: 10/14/2024 Posts: 33954 Rating: (4221)
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Why do set in the amplifier other values as the default values? |
12/29/2021 6:06 PM | |
Joined: 12/19/2021 Last visit: 1/9/2022 Posts: 19 Rating: (0) |
Hi, Which amplifier do you mean? B002 and B003 are set as default for PT100 |
12/29/2021 6:07 PM | |
Joined: 12/18/2014 Last visit: 10/14/2024 Posts: 33954 Rating: (4221)
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The amplifier in the PI controller .... |
12/29/2021 6:16 PM | |
Joined: 12/18/2014 Last visit: 10/14/2024 Posts: 33954 Rating: (4221)
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Take a look at the attached example ...
AttachmentPI_controller_example_0BA8.Standard.zip (652 Downloads) |
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