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WEG Modbus register maps

Updated 25 October 2026

1 WEG model, 62 registers in all, each re-typed from WEG’s own free documentation and checked against it.

• Variable frequency drive

  WEG CFW500 frequency inverter (Modbus RTU)

  WEG CFW500 drives as a Modbus RTU slave on the RS-485 port of the plug-in module (Modbus RTU User's Guide 10002253377 rev 04); parameter scaling from the V2.2X programming manual.

  62 registers · 30 writable · RTU
  Also known as: CFW500 VFD, CFW500-IOS, CFW500-CRS485, CFW500-CUSB, CFW500-CRS232

WEG: default communication settings

Factory defaults as the manufacturer documents them. Change one setting at a time on site and write down what you changed. Word order applies to 32-bit values; the addressing column says how the manufacturer prints register numbers (every map on this site also gives the 0-based wire address).