Modbus Register Maps

Free, downloadable register maps for PLCs, VFDs, sensors, and industrial devices. Built by engineers, for engineers.

Industrial Modbus devices — a power analyzer, a variable-frequency drive, and a PLC
93,700+ registers and growing!
Vendor Device Family Type Registers Updated
ABB M4M Energy Efficency Digital Network Analyzers 1364 Aug 17, 2026
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