GE Multilin D20MX – Advanced Substation Substation Controller


The Multilin™ D20MX Substation Controller is designed to execute communications and energy management applications for the monitoring and control of electrical substations. It is capable of amalgamating data from multiple slave devices and D20 I/O modules connected via communication channels into a single database using various protocols.

Key Benefits:

  • Supports multiple partitions which eases the upgrade of D200 multi-processor configurations
  • Reduces legacy D20/D200 RTU upgrade expenditures by over 50% through backwards compatibility with existing D20/D200 installed accessories, such as chassis, modems and D20 I/O peripheral modules
  • Minimizes operation and maintenance costs of existing D20/D200-based SCADA infrastructure by leveraging existing designs, processes and infrastructure
  • Enables simpler and more efficient compliance with NERC-CIP requirements through the application of native cyber security features built into the D20MX Substation Controller
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The D20MX represents the next innovation in GE’s cyber secure RTU technology for NERC-CIP environments. The D20MX is built upon the field-proven Multilin D20 technologies and continues the tradition of reliable automation and control through high quality and long term product availability.

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.

The 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.

The Multilin D20MX provides a cost-effective alternative to upgrades of legacy D20/D200 RTUs. This means that the investments made in GE’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 continues to invest in a partnership with their customers through advanced modular design principals


Download the D20MX brochure here:



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