Im trying to migrate working vfd modbus control from mach3 to mach4. However if I use the same register numbers, some get “Illegal data address exception response”
Read registers work fine. Write registers have this issue.
Im using Delta VFD-E. Troublesome registers are 2000H(control) and 2001H (frequency) (8192 and 8193)

Hi,
there was/is a current thread which has an idea that you should investigate:

https://www.machsupport.com/forum/index.php?topic=47113.0

It concerns register addressing. Some installations number the registers 0,1,2,3......8192......etc whereas some others number them 1,2,3.....8192....etc.
There is a setting in the Mach4 Modbus plugin which allows you to select either protocol.

Craig

Thank you very much, it worked. im just going to mention, that it’s useful to restart mach4 between some modbus configuration changes.