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M91 Modbus

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The logic that you displayed appears correct. Have you also configured the M91 controller for use as as MODBUS master? The U90 help file under Communications/ MODBUS describes how to configure the controllers Network ID, timerout, retries, time delay, and baud rate. If this is not set up properly or the baud rate is not matched to the device you are communicating with this could cause an issue.

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Thank you for your quick response.
I have found my mistake. Modbus I have set correctly.
I am trying to control with the Mobus an inverter. This accepts the command only when a number of bytes currently being used as bytes consist of a MSB and LSB.
So I SI143 set to 10.
Now the inverter is running.

Greeting Cook





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