Writing input current limit with modbus

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tryhou-victor asked Mar 25, '22

Writing input current limit with modbus

Hello

I want to change the input current limit with a plc via Modbus. Now it's working with a DMC panel, but I want to automate it. I've written a value to address 22 with the correct Unit-id but nothing is changing. I have no idea what's wrong. If someone can help me, it would be nice.

Regards Tryhou Victor

Venus OS Modbus TCP Digital Multi Control

2 |3000

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Modifications Space

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Answer 1 · 2022-03-25T14:39:44Z

shaneyake answered · Mar 25, 2022 at 02:39 PM

Have you turned Modbus on the GX?
It that same window under Services - > Modbus. It will show any errors. That is a good place to start.

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2 |3000

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tryhou-victor commented · Mar 29, 2022 at 12:57 PM

Modbus is enabled on the GX and I can read values. Writing don't succeed.

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shaneyake tryhou-victor commented · Mar 29, 2022 at 04:09 PM

What error are you seeing on the GX screen? Settings - > Services - > Modbus
It has a Modbus status area that will show any errors.

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tryhou-victor shaneyake commented · Mar 30, 2022 at 07:55 AM

I have no errors. I wrote the value 300 to the adress 22. But nothing change. Is it possible, I have to activate an adress before I can write to adress 22? I work with a Venus GX.

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knipsel.png (26.9 KiB)

shaneyake tryhou-victor commented · Mar 31, 2022 at 03:57 PM

Can you post the code you are using to write? If you have no errors here and it isn't changing then possibly you aren't writing?

Is the GX firmware up to date?

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