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Reading AI1 over modbus TCP

Created by: TC135 at: 6/20/2023 1:13 PM (4 Replies)

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6/20/2023 1:13 PM	Rate (0)
TC135 Member Joined: 1/26/2022 Last visit: 1/23/2025 Posts: 46 Rating: (0)	Hello, I currently have a project where i am logging run time, cycles & pressure. Using an IoT gateway that can read from the logo with modbus TCP. I am getting the values back to my cloud system for run time & cycles but for some reason i am only getting a 1 or 0 when trying to read the AI1 (pressure sensor ranged 0-100) my JSON configuration file is set to read input register 1, per what the logo manual says. Can anybody help please?

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6/20/2023 2:07 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/4/2025 Posts: 35925 Rating: (4496)	Hmmm ... It's always bad to make a correct statement if you can't see exactly what was programmed. Please upload your program as a ZIP file.

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6/20/2023 2:44 PM	Rate (0)
TC135 Member Joined: 1/26/2022 Last visit: 1/23/2025 Posts: 46 Rating: (0)	I have attached this for you. I have also made the assumption that AI1 is a 16bit integer, is this correct? Attachment logo program.zip (487 Downloads)

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6/20/2023 2:57 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/4/2025 Posts: 35925 Rating: (4496)	The LOGO! reads the analog inputs and convert it to 0-1000 units, it's a 16-bit signed interger value. In your project have you set the LOGO! as a server. So I don't can see what you have make on the JSON side. The LOGO! has by modbus addresses a offset of +1. Try to read it as IR0, not as IR1.

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This contribution was helpful to 1 thankful Users TC135

6/20/2023 3:07 PM	Rate (0)
TC135 Member Joined: 1/26/2022 Last visit: 1/23/2025 Posts: 46 Rating: (0)	Thank you SO much, i was completely stumped on this one, but you have solved my issue. Once i changed the JSON file to look at ir0 it fixed my issue.

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This contribution was helpful to 1 thankful Users ixo65

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Reading AI1 over modbus TCP

Created by: TC135 at: 6/20/2023 1:13 PM (4 Replies)

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Reading AI1 over modbus TCP

Created by: TC135 at: 6/20/2023 1:13 PM (4 Replies)

Rating (1) Thanks 2

5 Entries

TC135

ixo65

TC135

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ixo65

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TC135

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