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How to read more than 125 Registers in Modbus TCP/IP through DTM Broeser?

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AhmadJamal1997
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Posted: ‎2025-05-23 08:13 AM

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Posted: ‎2025-05-23 08:13 AM

How to read more than 125 Registers in Modbus TCP/IP through DTM Broeser?

 

Hello,

I'm trying to read around 190 registers by DTM Browser in M580 through BMENOC301_2:

1. First Request: 125 Registers.

2. Second Request: 71 Registers.

 

125+71 Registers.png

 

but I received only the first 125 Regiters, Can I toggle the requests cyclically by disabling connection bits (I don't know where they are)?

 

 

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ciupol
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Posted: ‎2025-05-28 05:25 AM

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Posted: ‎2025-05-28 05:25 AM

You shouldn't need to toggle connection bits. All the registers should be read. A device DDT is created for this connection. See below. Free0 is the data for your first request and Free1 is the data for your second request.

ciupol_0-1748435126108.png

 

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AhmadJamal1997
Crewman AhmadJamal1997
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Posted: ‎2025-05-31 05:02 AM

In response to ciupol
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Posted: ‎2025-05-31 05:02 AM

Thanks for your reply @ciupol 
I have already implemented it the same way, but it didn't work.

It only accepts the first request.

DTM Browser.png

 

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ciupol
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Posted: ‎2025-06-02 06:52 AM

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Posted: ‎2025-06-02 06:52 AM

Not sure what you are communicating with but is it possible that your Modbus device supports only single connection?

 

According to NOC301 manual (below), turning connections ON/OFF is possible by object ID. I have never done this and I am not sure what does that mean.

ciupol_0-1748872227273.png

 

If your device truly supports only single connection it may be easier for you to use READ_VAR block rather then use DTM browser.

 

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