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LOGO Modbus TCP

Created by: greenwlad at: 3/27/2024 3:37 PM (30 Replies)

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3/27/2024 5:24 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	To see the online values correct, select the F/I blocks. The appears a little pair of glasses. Click on them ...

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3/28/2024 7:22 AM	Rate (0)
greenwlad Posts: 15 Rating: (0)
greenwlad Posts: 15 Rating: (0)
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3/28/2024 7:34 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	You have select the wrong data input type. You have select "Double". That is a 64 bit data type. You must select "Float". That is a 32 bit data type.

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3/28/2024 7:49 AM	Rate (0)
greenwlad Posts: 15 Rating: (0)	I missed that. But the result is the same with float
greenwlad Posts: 15 Rating: (0)
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3/28/2024 7:55 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	I'm sorry, but then I don't know how I can help you more. I don't know the Modbus device and don't know what needs to be parameterized there.

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3/28/2024 7:57 AM	Rate (0)
greenwlad Posts: 15 Rating: (0)	OK, thank you for all your help. If I manage to solve it I will let you know
greenwlad Posts: 15 Rating: (0)
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This contribution was helpful to 1 thankful Users ixo65

3/28/2024 10:36 AM	Rate (0)
greenwlad Posts: 15 Rating: (0)	I think I have found the reason. It seems that the power meter sends word in little endian order. I made a python program where I changed the word order from BIG to LITTLE and then I can read the correct values. The bit order is BIG endian but the word order is LITTLE endian Is it possible to chanege the word order in LOGO ?
greenwlad Posts: 15 Rating: (0)
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3/28/2024 10:47 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	There's no block for a swap function. This has to be done manually in the program by reading and writing back to another area of the VM memory.

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3/28/2024 11:02 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	What kind of swapping do you mean? Wordwise? W1, W2 > W2, W1 Or byte by byte? B1, B2, B3, B4 > B4, B3, B2, B1

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3/28/2024 11:19 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	So you can make swapping wordwise.

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This contribution was helpful to 1 thankful Users greenwlad

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