Cost Effective Upgrade Solution

Utilities have large investments in hard wired automation systems. As a piece of equipment ages it fails more frequently, takes longer to repair, and eventually reaches the end of its life. Re-design and forklift replacements require utilities to re-engineer substation designs, replace field wiring, and re-train staff to manage and maintain the system, which is a costly endeavor.

The D.20 RIO option with support for D.20 communications provides a cost effective alternative to upgrades of legacy D20 RTUs. Simply replace the failed or end of life D20 unit with a D400 Gateway and D.20 RIO module, plug the D.20 interface cable into the D.20 RIO, connect the D.20 RIO to the D400 or an Ethernet port in the substation LAN and you are ready to add modern functionality to the D400 series of Substation Gateways including:

  • Cyber security features for integration into NERC CIP environments
  • Secure real time browser access
  • Browser-based HMI interface
  • Secure remote engineering access
  • IEC 61850 capabilities
  • Automatic record retrieval (fault records, SOE, settings files, any other file available in the IED)
D20 RTU Upgrade process explained

I/O Where You Need It, Minimizing Wiring Cost

The D.20 RIO Distributed I/O Controller is a small form factor stand-alone device that supports two D.20 link channels for communication with the D20 series of input / output modules.

  • Interface with standard D20 I/O (status, analog input, control and combination input) peripheral modules
  • Support for up to 30 I/O modules in a single D.20 RIO, or distributed over up to four D.20 RIO devices within the substation
  • Small form factor with multiple mounting options for installation flexibility: 19" Rack, panel mount or DIN Rail

Use the D.20 RIO module to install input / output modules in the substation LAN. No substation LAN? No problem, connect the optional D.20 RIO device directly to the built-in D400 Ethernet switch.

I/O Where You Need It, Minimizing Wiring Cost

User Interface

Front Panel 

Back Panel

Multilin D20 RIO controller with labeled features including power, D20 link, and Ethernet ports

Technical Specifications

Technical Specifications

Manufacturing for the D20MX portfolio has been discontinued. Please contact GE Vernova for availability.

Multilin D20MX Substation Controller Legacy

Simple to Advanced Substation Automation Control

Manufacturing for the D20MX portfolio has been discontinued. Please contact GE Vernova for availability.

Advanced Controller

The Multilin D20MX Substation Controller collects, filters, and sorts data from a wide range of intelligent devices (RTUs, relays, meters) in the substation. The D20MX preserves original data time stamps for accurate sequence of event (SOE) logs, allowing data from large diverse geographic regions and time zones to be analyzed in extreme detail. Data can be presented simultaneously to multiple SCADA hosts. The D20MX comes with a built-in suite of protocols and security applications to facilitate integration with various substation devices and SCADA hosts.

D20MX is the sixth generation of D20 CPUs designed to provide a smooth migration path for D20 users to extend the life of aging D20 systems. It introduces a new and modern network security feature suite that enables effective compliance with NERC-CIP requirements, using open and trusted standards and protocols that allow integration with modern cyber security systems and tools.

Advanced Substation Controller Connectivity

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D20MX Upgrade Process

The Multilin D20MX provides a cost-effective alternative to upgrades of legacy D20/D200 RTUs. This means that the investments made in GE Vernova’s automation systems keep paying dividends beyond their originally projected end of life. Simply replace the Multilin D20/D200 processor module with a Multilin D20MX and migrate the device configuration to extend the life of the existing D20/D200 Controller. Add cyber security features for integration into NERC-CIP environments. As technology changes with market demands, GE Vernova continues to invest in a partnership with their customers through advanced modular design principals

D20MX upgrade solutions table

Integration into NERC-CIP Environments

The Multilin D20MX supports a comprehensive set of security functions to allow a seamless integration with existing IT department policies. Built-in cyber security features, such as Remote Authentication Dial-In User Service (RADIUS), Role Based Access Control (RBAC), and user activity logging, provide a complete security toolkit required to enable simpler and more efficient compliance with NERC-CIP requirements, using open and trusted standards and protocols, that allow integration with modern cyber security systems and tools.

Centralized Authentication and Authorization

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Hardware Overview

Backwards Compatibility with Earlier Vintages of Multilin D20 RTUs

The Multilin D20MX is an embedded single board computer powered by a 667 MHz PowerQUICC II Pro processor pin-for-pin compatible unit with existing D20 Processors and accessories, such as chassis, D20 remote I/O peripherals, modems.

Fully Equipped Out-of-the-Box

Previous generations of D20/D200 RTUs required add-on system components and software to support Ethernet communications and optional memory expansion. The new D20MX is equipped by default with integrated memory, 10/100/1000BASE-TX or 100BASE-FX IEEE 802.3 compliant communications and a core load firmware with a comprehensive set of key substation automation applications.

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D20 I/O options

A complete family of substation hardened I/O modules makes the D20MX controller scalable to both large and small substations. A distributed architecture with both ring and star topologies allows for easy expandability and remote placement of I/O modules. The following I/O modules are available in a variety of models with I/O ranges up to 300VDC.

D20S - 64 channel status input moduleBuy Now
D20A - 32 channel DC Analog input moduleBuy Now
D20K - 32 channel control output moduleBuy Now
D20KI - 8 external interposer relay pairs moduleBuy Now
D20C - 16 status input, 8 control output, optional 16 DC analog inputs or 8 analog inputs and 8 analog outputsBuy Now
I/O with DNP Communication

The DNP I/O modules are data collection and control devices that combine the DNP 3.0 communications protocol with our existing industry proven and robust line of I/O modules. The DNP I/O modules implement the industry standard DNP 3.0 (Level 2) slave protocol over a single RS485 interface to provide expandable I/O functionality for the D400, D25 and iBox product lines, as well as third-party products.
The following DNP I/O modules are available:

DNPIO-DI (D20S)Buy Now
DNPIO-DCAI (D20A)Buy Now
DNPIO-CO (D20K)Buy Now
DNPIO-C (D20C)Buy Now

Manufacturing for CHC has been discontinued.  As an alternative, please refer to P153, P14N or

CHC Instantaneous Overcurrent - Legacy

Manufacturing for CHC has been discontinued.  As an alternative, please refer to P153, P14N or

Manufacturing for CFVB has been discontinued.

CFVB Voltage-balance Relay - Legacy

Manufacturing for CFVB has been discontinued.

Manufacturing for CFD has been discontinued.

CFD High Speed Differential Relay - Legacy

Manufacturing for CFD has been discontinued.

Manufacturing for CEYG has been discontinued . As an alternative, please refer  to D60 or P443.

CEYG – Legacy

Reactance and Mho Phase Directional – Distance Relay

Manufacturing for CEYG has been discontinued . As an alternative, please refer  to D60 or P443.

Manufacturing for this product  has been discontinued. As an alternative, please refer to the 3 Series relays.

CEY Reactance and Mho Phase Directional-distance - Legacy

Manufacturing for this product  has been discontinued. As an alternative, please refer to the 3 Series relays.

Manufacturing for this product has been discontinued. As an alternative, please refer to the 3 Series relays.

CEX Angle Impedance Relay - Legacy

Manufacturing for this product has been discontinued. As an alternative, please refer to the 3 Series relays.

Manufacturing for CEH has been discontinued.

CEH Loss of Excitation Relay - Legacy

Manufacturing for CEH has been discontinued.

Manufacturing for this product has been discontinued. As an alternative, please refer to the 3 Series relays.

CEB Offset Mho Directional-distance - Legacy

Manufacturing for this product has been discontinued. As an alternative, please refer to the 3 Series relays.