Industrial 57404-2C Network Communications Module

The Reliance Electric 57404-2C Network Communications Module is a compact printed circuit board designed to function as the network interface for Reliance Electric Automax PLC systems. This is a legacy module that is no longer in active production. The front panel features a red power switch, a green LED labeled ON, and two small openings, with clearly labeled MONITOR and NETWORK ports for external connections, as well as two faceplate openings at the top and bottom for mounting screws. The unit slides into its chassis slot and is secured with screws, presenting a small, purpose-built enclosure for network communications within the Automax NC family. In catalog terminology, the 0-57404-2 designation is associated with this family, and alternative listings reference the 57404-2C variant; related network modules in the same lineage include 57C404B, which is described as a network communications module for Automax PLCs. Because these components are legacy, they are typically encountered through refurbishers or used-parts suppliers rather than new inventory. The module’s role is to provide a dedicated network interface for Automax control architectures, enabling data exchange and monitoring between the PLC and external networks within the constraints of the original Reliance Electric NC platform. When matching for replacement or integration, verify compatibility with the specific Automax chassis and renewal options from reputable refurbishers or catalog providers to ensure proper pinout and fit.