The GE IS220PDOAH1A/B is a discrete output module designed for use in GE’s distributed control systems, particularly those in the Mark VI series4. It serves as a crucial component in facilitating the management of relay outputs and feedback signals related to the terminal board5.

This module provides the electrical interface between one or two I/O Ethernet networks and a discrete output terminal board4. It contains a processor board common to all Mark VI distributed I/O packs and an acquisition board specific to the discrete output function4. The pack can control up to 12 relays and accepts terminal – board – specific feedback4. It supports both electromagnetic relays (with types TR LYH1B, C, D, and F terminal boards) and solid – state relays (with type TR LYH1E boards)4. Input to the pack is through dual RJ45 Ethernet connectors and a three – pin power input, while output is through a DC – 37 pin connector that directly interfaces with the associated terminal board connector4. Visual diagnostics are provided through indicator LEDs, and local diagnostic serial communications are possible through an infrared port4.