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Modbus Big/Little Endian and bits frame

Created by: jmonzon at: 11/10/2021 7:57 AM (6 Replies)

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11/10/2021 7:57 AM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	Hi everyone, Currently I'm in a proyect where a LOGO is used as a client in modbus communication. How can I change between Big Endian and Little Endian? Is there a option to do a swap? Related to this I would like to know how can I see the entire bits frame in the data table. I'm reading a 2 words register but only 16 bits are displayed in the data table. Maybe I'm missing something so any help will be aprecciated! Thank you very much in advance!!

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This contribution was helpful to 1 thankful Users JohnPE

11/10/2021 8:06 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/6/2025 Posts: 35929 Rating: (4497)	The LOGO! has big endian and this is not "switchable". You have to "manually" rearrange the bytes or words. There is no ready-made block for this function. In the data table you have to select the corresponding data type (e.g. VD) and the corresponding data format, then the 32-bit values or 32-bit are also displayed as a bit pattern.

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11/10/2021 10:03 AM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	ixo65 You have to "manually" rearrange the bytes or words. There is no ready-made block for this function. How can I do that?

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11/10/2021 10:05 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/6/2025 Posts: 35929 Rating: (4497)	Then give an answer: What will you swap? Bytes or words?

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11/10/2021 10:14 AM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	I want to swap words

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11/10/2021 10:28 AM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/6/2025 Posts: 35929 Rating: (4497)	See attachment. Attachment Untitled.png (571 Downloads)

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This contribution was helpful to 1 thankful Users jmonzon

11/10/2021 11:07 AM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	That's a very ingenious solution!! Thank you very much!!! [snip]
	Last edited by: Jen_Moderator at: 11/10/2021 14:02:54 Division of questions into separate topics.
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