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Johanb

MODBUS Question

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Is there a way to change the status from the inputs 18;19;32;33 from a Danfoss inverter in a Modbus telegram .

regards Johan

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This is the Omron forum, not sure if you meant to post this here or not, but you are unlikely to get a response to this question here.

 

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Hallo Michael .

I am using a OMRON PLC with a SCU42 card to communicate with a Danfoss inverter .

The OMRON PLC runs a MODBUS RTU master prog .

The Value for the program are set in a NS5 screen with FINS/TCP connection

The Danfoss inverter communicate in MODBUS to the SCU42 card .

I was hoping to find someone that knows how to send a MODBUS telgram with 16 bit instead of the default 8 bit .

 

regards Johan

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Ah, well that is different.  Lets see if someone can help you...

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Its been a while since I used Modbus Protocol, but isnt it possible to define your own telegrams, meaning that you can transmit the two required bytes by including them when defining the telegram itself?

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Hallo Hanselot .

I have tryed to make my own telegram .

the problem I have is that the I use macro's in the NS5 screens to make the telegram .

but MODBUS sends 8 Bit and the Controle Word from DANFOSS is 16 bit .

if you have a telegram that can do 16 bit .

i wil try it .

regarsd Johan

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