Product Overview

The General Electric IS420YDOAS1B is a high-performance Discrete Output (DO) I/O pack designed for the Mark VIe control architecture and EX2100 Excitation Control systems. This module acts as the digital intelligence layer between the controller's Ethernet network and the physical terminal boards. It is specifically engineered to drive up to twelve independent relay outputs while simultaneously monitoring terminal board feedback to ensure loop integrity.

Housed in a ruggedized outer chassis, the IS420YDOAS1B facilitates high-speed communication via dual RJ45 Ethernet ports, supporting redundant network topologies. It translates digital commands into physical actuation through a high-density DC37 connector, making it a critical component for controlling motor starters, solenoids, and process interlocks in turbine and generator environments. As an active product within the GE Speedtronic family, it represents a modern solution for reliable discrete signal management.

Technical Characteristics and Architecture

• Redundant Network Interface: Equipped with dual Ethernet ports to allow for seamless integration into Ionet architectures, ensuring control is maintained even if one network link fails.

• Twelve-Channel Relay Control: Manages twelve discrete outputs with dedicated feedback monitoring for each relay to verify successful state changes.

• Advanced Visual Diagnostics: The front panel includes a comprehensive LED array. Twelve yellow LEDs provide immediate confirmation of relay activation, while "BBPx" and "ATTN" LEDs communicate processor health and application status through specific flash patterns.

• Operational Intelligence: Built-in firmware tracks internal hardware health, triggering specific system alarms (such as Remote I/O mode alerts) if a configuration mismatch or hardware fault is detected.

• Rugged Mechanical Shielding: The internal circuitry is protected by a specialized metallic chassis designed to dissipate heat and shield sensitive electronics from electromagnetic interference (EMI).

• Simplified Connectivity: Utilizes a standard three-pin power input and a DC37 pin connector for direct, secure coupling with the discrete output terminal board.

  
  

Technical Specifications

• Manufacturer: General Electric (GE)

• Model Number: IS420YDOAS1B

• Product Family: Mark VIe / EX2100

• Module Type: Discrete Output I/O Pack

• Output Quantity: 12 Channels

• Communication: Dual 10/100 Ethernet (RJ45)

• Connector: DC37 Pin

• Weight: 0.22 kg

• Dimensions: 2.1 x 18.6 x 26.3 cm

• Operating Status: Active

• HS Code: 8537101190

Industrial Application Areas

• Excitation Control: Managing field flash relays and de-excitation contactors within the EX2100 system.

• Turbine Sequencing: Controlling auxiliary pumps, fans, and heating elements in steam or gas turbine operations.

• Emergency Shutdown (ESD): Actuating safety-related discrete outputs in integrated control and safety systems.

• Power Generation: Coordination of generator breaker trip and close signals within a Mark VIe DCS.