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Modbus refnum


fipm
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Hi,

 

I am trying to establish Modbus communication between Power PMAC and a HMI.

 

The HMI has an offset in the address of some of the variable types. For example, the float variables start in the 300000 register. Inputting Modbus Client On-Line Commands to the PMAC related with float variables returns me an error regarding the 'refnum' parameter. As I have checked in the documentation, the refnum range is 0 – 8191, so clearly does not match with HMI's.

 

How could I solve this? Is it possible to add an offset?

 

Thanks in advance

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Modbus addresses are only 16-bit values, so the max is $FFFF or 65535 and 300000 will not work in any Modbus device. I guess you would have to use a different set of addresses for passing thru Modbus.

 

Hi,

 

I am trying to establish Modbus communication between Power PMAC and a HMI.

 

The HMI has an offset in the address of some of the variable types. For example, the float variables start in the 300000 register. Inputting Modbus Client On-Line Commands to the PMAC related with float variables returns me an error regarding the 'refnum' parameter. As I have checked in the documentation, the refnum range is 0 – 8191, so clearly does not match with HMI's.

 

How could I solve this? Is it possible to add an offset?

 

Thanks in advance

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