Phoenix Contact EEM-MA370

Three-phase energy meter

Connect the EEM-MA370 Ethernet meter to Edge over Modbus TCP. Start with frequency, compare it with the display, then add electrical readings. Configure external 1 A or 5 A CTs for the installation.

  • Modbus TCP
  • HTTP
  • MQTT

Three-phase energy meter

Ask an engineer

Compatibility

Compatible with EpiSensor Edge over Modbus TCP

Phoenix Contact documents FC03/FC04 reads and 32-bit float encoding for its public process-data example. This is a source-documented starting procedure, not a physical Edge test.

Best-effort starting map for EEM-MA370 order 2907983. Compare readings with the display and record firmware; adjust the point configuration if needed. Monitoring only.

Connect it with

EEM-MA370 is configured on the local network

  • Modbus
  • Edge
  • Platforms
Three-phase energy meter
Interface
Gateway
Edge
Output
EEM-MA370EEM-MA370
Protected EthernetSegmented LAN
ZGW-20 GatewayHosts Edge locally
EpiSensor EdgeModbus client + register map
Customer platformMQTT · API · files
Modbus TCP
Protected Ethernet
Runs locally
Optional onward data
Connect the meter RJ45 port to the local monitoring network and add its IP address to the Edge Modbus TCP configuration. Use read operations; retain the existing meter settings. The customer-platform output is optional; Edge remains the local system of record.

Models

Download
ModelsInterfaceRoute into Edge
EEM-MA370, order number 2907983Display model for external 1 A or 5 A current transformers; Modbus/TCP over RJ45; REST from firmware 1.1.0 and MQTT from firmware 1.7.0Ethernet Modbus TCP to Gateway running Edge. Start with the frequency read below.
EEM-MA370-R, order number 2907980Related display model with Modbus/TCP and Modbus RTUTreat as a separate model. The serial interface on the -R variant is not present on the EEM-MA370 covered here.
EEM-MA371 and EEM-MA391 variantsRelated models for Rogowski or low-voltage current-transformer inputsDo not reuse the EEM-MA370 current-input assumptions or point configuration.

Specifications

Phoenix Contact identifies order number 2907983 as the EEM-MA370 display model with current-transformer inputs and Modbus/TCP. The -R and 24 V DC variants have different interface or supply contracts and must be identified separately.1

Measurement
Three-phase voltage and external 1 A or 5 A CT current inputs; continuous simultaneous acquisition2
Voltage range
18 to 690 V AC phase-phase and 11 to 400 V AC phase-neutral2
Current range
External CT primary from 1 A to 20,000 A with 1 A or 5 A secondary2
Energy accuracy
Active energy class 0.5 S under IEC 62053-22; reactive energy class 2 under IEC 62053-232
Ethernet
100Base-TX RJ45 with Modbus/TCP, REST API and firmware-dependent MQTT12
Environment
-25 to +70 degrees Celsius; IP20 housing and IP40 display; up to 2,000 m altitude2

Interface

Documented measurements and integration boundaries for EEM-MA370.

  • Frequency: address 32780, 2 registers, Hz.
  • System current: 32825; system conductor voltage: 32829; total active power: 32790. Each uses 2 registers.
  • The optional mapped read area starts at 57600 and holds 125 registers, not 125 measurements. Its content depends on the web configuration.
  • Keep configuration and resets outside the monitoring client.

Assessment

EEM-MA370 order 2907983, using the published starting map and display checks.

InteroperabilitySupported with conditions
Documented Modbus TCP reads, encoding and example electrical addresses support a practical starting point.345
AccuracySupported with conditions
Electrical ranges and accuracy are documented. Correct CT configuration and display comparisons establish the installation measurement scale.2
SecurityLimited
The published Modbus/TCP path has no stated peer authentication or encryption, and the device exposes writable configuration areas.3
ReliabilityNot yet assessed
Point-specific unavailable-value codes are not established in the retained documentation.3
RuggednessSupported with conditions
Temperature, enclosure and altitude limits are published for a suitable electrical panel installation.2
ScalabilitySupported with conditions
A configurable contiguous process map can reduce requests, subject to controlled mapping, network design and a bounded polling plan.3
LifecycleSupported with conditions
Dated OEM documentation supports a starting map. Record firmware and retain the configuration used at commissioning.12

Setup

First read: supply frequency

Use the published process-data example for a best-effort initial read. Check the result against the local display.

Function
FC03 (FC04 returns the same registers)
Start address
32780 decimal (0x800C). Use the raw address; a client using one-based register labels may display 32781.
Length
2 registers
Decode
32-bit IEEE 754 float, low word first (CDAB wire-byte order). Phoenix calls this little-endian byte swap.
Example
Words 0x0000, 0x4248 reconstruct 0x42480000 = 50.0 Hz. This is a decoding example, not a measured device response.

Acceptance: Accept a finite value matching the display. If it differs, check the client address convention and word order. Mark failed reads as missing.

  1. Confirm the exact article

    Record EEM-MA370 and order number 2907983 from the device. Capture firmware, serial number, supply variant and Ethernet configuration.

  2. Record the measurement circuit

    Document voltage wiring, CT primary and secondary ratings, CT polarity and phase assignment. Verify the configured values against the installation drawings.

  3. Read frequency first

    Use FC03 at address 32780 for 2 registers. FC04 returns the same data. Start with the published address and compare with the display.

  4. Decode and expand

    Decode a 32-bit IEEE 754 float with the low word first. Compare current, voltage and power with the display before adding them to monitoring.

  5. Use the mapped block when useful

    The web configuration can group readings for fewer requests. Record the mapping before polling it; retain individual addresses for troubleshooting.

Common questions

Can Edge read the EEM-MA370 over Modbus TCP?
Yes, use the documented Modbus TCP read path and the first-read procedure below. Compare with the display before expanding the point set.1345
Is the EEM-MA370-R the same integration?
No. The -R variant adds Modbus RTU, while order number 2907983 covered here is the Modbus/TCP display model. Identify the exact order number before designing the network.1
Does class 0.5 S make the Edge record suitable for billing?
No. The meter specification describes the instrument. A copied or calculated Edge series does not inherit an approved revenue or settlement role.2
Can Edge configure the 125-register mapped area?
Configure the optional map in the meter web interface, then read it from Edge. Keep allocation writes outside the monitoring client.3

Sources

  1. EMpro product overview for rail-mounted meters with display (opens in a new tab) Phoenix Contact
  2. EEM-MA370 technical data (opens in a new tab) Phoenix Contact
  3. EMpro Modbus mapping (opens in a new tab) Phoenix Contact
  4. EMpro Modbus read functions (opens in a new tab) Phoenix Contact
  5. EMpro data types and word order (opens in a new tab) Phoenix Contact

Further reading

Product names and trademarks belong to their owners. Publication does not imply endorsement or a commercial relationship.