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PT100 periodically reading 0°C

Created by: Luwarick at: 2/25/2025 10:42 AM (17 Replies)

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2/25/2025 2:25 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	So far I have assumed that you only have one LOGO!. You didn't write before that it is a larger project. The situation looks different. Are you sure that the value in the LOGO! goes to zero? Or only on the HMI? Or only on the second LOGO!? You should describe in more detail what exactly is happening.

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2/25/2025 3:18 PM	Rate (0)
Ella_68 Gold Member Joined: 6/11/2019 Last visit: 8/31/2025 Posts: 2623 Rating: (122)	A second logo ? It's not that the error is in the data transfer or double use of the memory. Which logo types are installed and is the firmware of all logos up to date ? Ella_68

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2/25/2025 3:28 PM	Rate (0)
Luwarick Advanced Member Joined: 7/6/2017 Last visit: 6/30/2025 Posts: 53 Rating: (2)	Hi ixo65, sorry should have elaborated more. I am reading 0.0°c on my HMI, but I believe the Logo is reading/processing it as 0 also, as I am using this sensor as a weather compensator and switching target flow temps depending on the reading of AI8. The Logo is switching to the desired flow temp of 0°C. The Logo are setup as master master on the network and they do passed data between each other and both pass data back and forth with the HMI, however this section of the program with AI8 does not pass data or has any connection with the program in the other Logo. I have a few things I now need to check so will report back any conclusions.
	Last edited by: Luwarick at: 02/25/2025 15:33:11
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2/25/2025 3:33 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	I'm sorry, but I don't understand. I'd rather see the program so I can understand it. I'm almost certain now that the error isn't in the hardware.

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2/25/2025 3:54 PM	Rate (0)
Luwarick Advanced Member Joined: 7/6/2017 Last visit: 6/30/2025 Posts: 53 Rating: (2)	Logo program attached in ZIP file.
	Last edited by: Luwarick at: 02/25/2025 16:21:48
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2/25/2025 4:18 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	You manipulate the temp value after the scaling. You referenced the value to the mathematical instruction B026. And with the flag M1 you determine which value is transmitted to the HMI. If M1 = 0, then the temperature of AI8. If M1 = 1, then the value 0. Then you don't need to be surprised that the HMI shows 0 °C.

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This contribution was helpful to 3 thankful Users Moderator_Lan Luwarick Ella_68

2/25/2025 4:21 PM	Rate (0)
Luwarick Advanced Member Joined: 7/6/2017 Last visit: 6/30/2025 Posts: 53 Rating: (2)	Doh! Thank you

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2/25/2025 4:27 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	Luwarick Doh! Thank you You scored a nice own goal there... Without seeing the program, we could have guessed for a long time ...

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