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Question regarding writing to register on a Modbus compatible device

Created by: martin_f1 at: 7/13/2023 3:52 PM (16 Replies)

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7/17/2023 8:47 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/12/2024 Posts: 34207 Rating: (4260)	Sorry, but I can't help you in this case, the file is ok. Start a Support Request.

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This contribution was helpful to 2 thankful Users qwazee martin_f1

7/17/2023 8:56 AM	Rate (0)
martin_f1 Joined: 7/3/2023 Last visit: 8/8/2023 Posts: 11 Rating: (0)	ixo65 I have created the project in LSC V8.3.1. I have no problem to open the project file. This is exactly what I did before, but I did it with both an input but also using a logical high input. I have the same IP addresses. I tried to use it with a modbus simulation program on my computer aswell and that works like a charm. Is there anyway you can debug this problem? I was thikning about using WireShark on my computer for the local network but it doesnt seem to send anything at all from the PLC to the ModBus device. Best regards

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7/17/2023 9:03 AM	Rate (0)
qwazee Platinum Member Joined: 3/30/2020 Last visit: 11/12/2024 Posts: 4950 Rating: (1011)	martin_f1 ixo65 I have created the project in LSC V8.3.1. I have no problem to open the project file. This is exactly what I did before, but I did it with both an input but also using a logical high input. I have the same IP addresses. I tried to use it with a modbus simulation program on my computer aswell and that works like a charm. Is there anyway you can debug this problem? I was thikning about using WireShark on my computer for the local network but it doesnt seem to send anything at all from the PLC to the ModBus device. Best regards There is a possibility that your software is not working as it should. Please talk to Siemens as Mr. ixo65 suggests. Use the "Support Request" link. Consider adding a project from your side. It will be a bonus if Mr. ixo65 (or another forum volunteer) has a look at what you have. But all the volunteer assistance still would not help if your software do not run properly.
	Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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7/17/2023 9:07 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/12/2024 Posts: 34207 Rating: (4260)	I was thikning about using WireShark on my computer for the local network but it doesnt seem to send anything at all from the PLC to the ModBus device. Have you allowed the Modbus access? File > Properties > Offline Settings > General

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8/7/2023 3:57 PM	Rate (0)
martin_f1 Joined: 7/3/2023 Last visit: 8/8/2023 Posts: 11 Rating: (0)	Just wanted to note that I fixed my problem. So for example if I send to register address 10, the LOGO will send to address 9, so if I want to send to 10, I have to send it to 11 instead. It did not state anything regarding it in the manual, in case someone else has a similiar problem in the future.
	Last edited by: martin_f1 at: 08/07/2023 15:57:47
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This contribution was helpful to 1 thankful Users Jen_Moderator

8/7/2023 4:37 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/12/2024 Posts: 34207 Rating: (4260)	martin_f1 Just wanted to note that I fixed my problem. So for example if I send to register address 10, the LOGO will send to address 9, so if I want to send to 10, I have to send it to 11 instead. It did not state anything regarding it in the manual, in case someone else has a similiar problem in the future. It's known that the LOGO! has an offset of +1 in the Modbus addresses.

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8/8/2023 8:16 AM	Rate (0)
martin_f1 Joined: 7/3/2023 Last visit: 8/8/2023 Posts: 11 Rating: (0)	I did not know it because I couldn't see it anywhere, and I couldn't find it either in the manual of the LOGO! But at least it works now so I am happy :)

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