The M550 is a fully programmable three phase power transducer with an isolated RS485 based communication port supporting a subset of Modicon's Modbus protocol.

Its accuracy is class 0.2% for input signals down to 10% Un and 10% In, (1% of reading for energy measurements.IEC1036), 50-60Hz.

The M550 measures Voltages, Currents, Import/Export Power (W, VAr, VA), True Power Factor, Frequency, Import/Export Demands(Wd, VArd, VAd, Ad) and Import/Export Energy (W.h, VAr.h, VA.h, and A.h, pulsed through a relay)

All measured quantities can be extracted from the transducer, the system's parameters can be set up remotely, important data can be saved to computer and the order of the Modbus registers themselves can be changed.

The relay installed in the M550 can be used as a flexible monitoring relay.

N.B. for firmware revisions 0.3.01.00-03-09-04 and later, the M550’s relay can have up to eight conditions attached to it, creating a very flexible monitoring system.

See also
(Release date 2012)
3X and duplicated 3X Registers
3X Register Order
4X Registers

Models pre 2012
M550/M560/M570 3X and duplicated 3X Registers
M550/M560/M570 3X Register Order
M550/M560/M570 4X Register

Firmware revisions 0.3.01.00-03-09-04 and later
M550/M560/M570 Assigning parameters to relays
M550/M560/M570 Reading the status of the relays