fipm Posted July 14, 2017 Share Posted July 14, 2017 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 Link to comment Share on other sites More sharing options...
Gregs Posted July 17, 2017 Share Posted July 17, 2017 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 Link to comment Share on other sites More sharing options...
Clopedandle Posted July 18, 2017 Share Posted July 18, 2017 The ModBoss strikes again. Link to comment Share on other sites More sharing options...
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