General Description

The YDOA Discrete Output Module is a high-reliability relay output I/O module designed for GE Mark VIe and Mark VIeS control systems. It provides 12 isolated Form-C relay outputs, supporting both normally open (NO) and normally closed (NC) switching for industrial control and protection applications.

The module communicates with controllers via redundant IONet Ethernet connections and interfaces with field wiring through a dedicated terminal board. It is suitable for use in Simplex and TMR (Triple Modular Redundancy) architectures and meets SIL 3–compatible system requirements.

Output Characteristics

Number of output channels: 12

Output type: Form-C relay outputs (SPDT)

Contact configuration:

Normally Open (NO)

Normally Closed (NC)

Rated voltage: 24 VDC

Channel indication: Individual status LED per channel

Feedback capability: Supports terminal board feedback monitoring

Relay outputs are suitable for driving solenoids, contactors, interposing relays, alarms, and other discrete field devices.

Communication Interface

Network interface:

Dual RJ-45 Ethernet ports

IONet industrial Ethernet

Function:

Redundant communication with Mark VIe / VIeS controllers

High-availability data exchange for control and diagnostics

Electrical Interface

Output connector:

DC-37 pin connector

Connects to compatible Mark VIe terminal boards

Power supply:

24 VDC

3-pin power input

Power consumption:

Approximately 10 W (rated)

Isolation and Protection

Electrical isolation:

1500 V isolation between isolated channels

1500 V isolation between channels and control logic

Protection level:

IP20 (for installation inside control cabinets)

Isolation ensures high immunity to electrical noise and reliable operation in harsh industrial environments.

Environmental Specifications

Operating temperature: −40 ℃ to +70 ℃

Storage temperature: −40 ℃ to +85 ℃

Designed for continuous operation in demanding power generation and industrial automation environments.

Mechanical Specifications

Dimensions: approx. 121 mm × 82.6 mm × 41.9 mm

Weight: approx. 0.6 kg

Redundancy and System Compatibility

Supports Simplex and TMR (Triple Modular Redundancy) architectures

Fully compatible with Mark VIe and Mark VIeS control systems

Designed for use with redundant controllers and redundant IONet networks

Certifications and Compliance

CE

UL

IEC 61508 (SIL 3 compatible within system architecture)

Core Features

12 isolated Form-C relay outputs with LED status indication

Dual IONet Ethernet ports for redundant communication

High electrical isolation for noise immunity and safety

Terminal board feedback monitoring support

Wide temperature operating range

SIL 3–compatible design for high-integrity control systems

Typical Applications

Gas and steam turbine control systems

Compressor and generator control

Valve, solenoid, and actuator control

Alarm annunciation and interlock logic

Trip, permissive, and auxiliary control functions in Mark VIe / VIeS systems

Key Advantages

Flexible Form-C relay outputs support a wide range of field devices

Redundant Ethernet communication improves system availability

Robust isolation and industrial design ensure long-term reliability

Seamless integration with Mark VIe / VIeS TMR architectures

GE IS420YDOAS1B｜Discrete Output I/O Module｜