GE D20 EME 10BASE-T

Description

Technical Parameters (Key Specs)

• I/O Capacity: 16 digital inputs, 8 digital outputs, 4 analog inputs (configurable 0–20 mA / 4–20 mA / ±10 V)

• Digital Inputs: Wet/dry contacts, 24–125 V DC (wide range)

• Digital Outputs: Form C relays, 5 A @ 250 V AC / 30 V DC (NO + NC)

• Analog Input Resolution: 16-bit, accuracy ±0.1% of full scale

• Ethernet Port: 1x 10BASE-T (10 Mbps only, RJ45, half/full duplex, auto-negotiation to 10 Mbps only) – this is the defining feature of the GE D20 EME 10BASE-T

• Additional Comms: 1x RS-232/485 (MODBUS RTU, DNP3 serial)

• Protocol Support: DNP3 (serial/TCP), MODBUS (RTU/TCP), IEC 61850 (GOOSE/MMS), IEC 101/104

• Power Supply: 24–48 V DC or 110–250 V DC/AC (field-selectable)

• Operating Temp: –40°C to +85°C (extended)

• Protection Class: IP40 with conformal-coated PCB

• Mounting: DIN-rail or panel mount

• Compliance: IEC 61850-3, IEEE 1613 (substation), CE, UL

Advantages & Features

• Legacy network compatibility – the GE D20 EME 10BASE-T connects directly to older SCADA master stations that only support 10 Mbps Ethernet, eliminating the need for media converters

• Substation-hardened design – withstands high EMI, transients, and temperature extremes per IEEE 1613

• Multi-protocol simultaneous operation – the GE D20 EME 10BASE-T can speak DNP3 to the master and MODBUS to local devices simultaneously

• IEC 61850 Edition 2 support – native GOOSE messaging and MMS over the 10BASE-T interface

• Hot-swappable I/O – replace cards without powering down the GE D20 EME 10BASE-T

• Cybersecurity features – secure authentication, role-based access control, and encrypted communication

• 1 ms sequence-of-events (SOE) – time-stamped event logging for fault analysis

• Redundant power input – dual feed option for high availability

Application Cases

• Legacy substation retrofits – the GE D20 EME 10BASE-T integrates into older 10 Mbps Ethernet networks while upgrading I/O capability, avoiding costly network infrastructure overhauls

• Distributed generation monitoring – wind and solar farms use the GE D20 EME 10BASE-T to report via DNP3 over 10BASE-T to legacy utility SCADA systems

• Water distribution SCADA – pump stations with older Ethernet switches that only support 10 Mbps benefit from the GE D20 EME 10BASE-T‘s native compatibility

• Railway traction power – trackside substations using the GE D20 EME 10BASE-T for catenary monitoring over established 10 Mbps fiber media converters

Comparison with Competitors

The GE D20 EME 10BASE-T is uniquely positioned for legacy network integration, offering cost savings over the standard GE D20 EME when 10/100 capability is not required. Compared to Siemens, the GE D20 EME 10BASE-T provides wider temperature range and standard conformal coating at a competitive price.

Selection Suggestions

• Network compatibility: Choose the GE D20 EME 10BASE-T only if your SCADA network strictly operates at 10 Mbps – for modern 100 Mbps or Gigabit networks, select the standard GE D20 EME or newer variants

• Application environment: The GE D20 EME 10BASE-T is designed for utility substations with extreme temperatures – ideal for outdoor/unconditioned enclosures

• Protocol requirements: If your master station uses DNP3 and local IEDs use MODBUS, the GE D20 EME 10BASE-T handles both – verify firmware version for specific protocol profiles

• I/O expansion: The GE D20 EME 10BASE-T can be daisy-chained with other D20 modules – plan total I/O count (max 8 units per D20 controller)

• Redundancy: For critical substations, order the GE D20 EME 10BASE-T with dual power input and pair with a redundant main processor

• Cable type: Use CAT3 or higher twisted-pair for 10BASE-T operation – the GE D20 EME 10BASE-T supports cable runs up to 100 meters

Precautions

• Speed mismatch – the GE D20 EME 10BASE-T cannot auto-negotiate to 100 Mbps – ensure your switch port is manually set to 10 Mbps or supports auto-negotiation down to 10 Mbps; otherwise, no link will be established

• ESD sensitivity – handle the GE D20 EME 10BASE-T with proper grounding despite conformal coating – use wrist straps during installation

• Power supply isolation – if using 110–250 V AC, ensure line-to-neutral only – the GE D20 EME 10BASE-T can be damaged by phase-to-phase connection

• Analog input wiring – use 4-wire connections for transmitters to avoid ground loops; analog inputs are differential but common-mode range is ±10 V – stay within range

• Digital output relay life – relays are rated for 100,000 operations at full load – for frequent cycling, use external solid-state relays to extend onboard relay life

• Firmware compatibility – when replacing a GE D20 EME 10BASE-T in an existing system, ensure the replacement unit has the same firmware version as the rest of the D20 network

• Grounding – the GE D20 EME 10BASE-T requires solid earth ground (≤ 1 Ω) – use dedicated ground terminal, not DIN-rail as primary ground

• Ethernet cable shielding – use shielded CAT5e (even though 10BASE-T only requires CAT3) – the GE D20 EME 10BASE-T is in high-EMI substation environments; shielding prevents communication errors

• IEC 61850 GOOSE – if using GOOSE messaging, verify switch multicast filtering – the GE D20 EME 10BASE-T can be overwhelmed by broadcast storms on a 10 Mbps link if not properly configured

• Storage – if stored > 6 months, re-apply power for 24 hours before deployment to reform capacitors

• Do not exceed I/O ratings – analog inputs are not isolated from each other (common reference) – using transmitters with different ground potentials can cause errors; use isolated transmitters if ground differences exceed 0.5 V

• Disposal – contains lead-based solder (pre-RoHS revisions) and lithium battery – dispose per local electronic waste regulations

GE 8521-EB-MT
SCHNEIDER MM-PM41400C/PM+4000
SIEMENS 319-3