device library

Phoenix Contact EMpro EEM-MA370 power meter

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

pointaddress (0-based)typescaleunit
firmware_revision256U32BE1
day_of_production336U161
month_of_production337U161
year_of_production338U161
hour_of_production339U161
minute_of_production340U161
second_of_production341U161
serial_number342U32BE1
hardware_revision346U161

link settings as documented (unverified): RTU/TCP; default 19200 8E1; unit ID 1; FC 03,04,06,16; Modbus/TCP opens port 502. Up to four Modbus/TCP connections can be open in parallel.

⚠ Only use external current transformers with reinforced or double isolation. Install current transformers and corresponding measuring devices only when the power supply of the system is disconnected. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)
terminalsGND, B-, A+, Ω
A/B polarityA+ (non-inverted), B- (inverted)
terminationIntegrated 120 Ω resistor, activated by bridging terminals Ω and A+
connectorRS-485 connection, RJ45 Ethernet connection
isolationBasic insulation against neighboring devices up to 300 V OVC III. Minimum clearance of 6 mm to neighboring elements must be maintained to achieve double insulation.
shield/groundGND: Shield of signal line
wiring notesMaximum tightening torque for the relevant screws: 0.5 Nm ... 0.6 Nm.
response timeout250 ms
broadcastsupported
protocol notesThe device does not differentiate between holding and input registers. Both function codes return the same registers.
identification notesThe device has three NetBios names, including manufacturer-specific NetBios names containing the device name and serial number.
power100 V AC ... 230 V AC ±20%, 150 V DC ... 250 V DC ±20%
accuracyWhen measuring by means of current transformers or Rogowski coils, the accuracy is greatly influenced by the quality of the current sensors used.
doc revisionUM EN EMpro DIN rail, Revision 00
field reports — community-sourced, unverified (checked 2026-06-11)
  • confirmed: Modbus/TCP opens port 502. Up to four Modbus/TCP connections can be open in parallel. — confirmed by Phoenix Contact EMpro DIN rail User Manual (109357_en_00) Section 11.2.3
  • confirmed: The device has three NetBios names, including manufacturer-specific NetBios names containing the device name and serial number. — confirmed by Phoenix Contact EMpro DIN rail User Manual (109357_en_00) Section 11.1.3
  • confirmed: response_timeout_ms: 250 — confirmed by Phoenix Contact EMpro DIN rail User Manual (109357_en_00) Section 7.5 / 11.2.4 (default gateway timeout is 250 ms)

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

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