Product Overview

The IS220PDIOH1A is a versatile, high-density Discrete I/O module engineered for the General Electric Mark VIe control platform. This "all-in-one" pack consolidates the capabilities of traditional input and output modules into a single, compact unit, designed to bridge one or two Ethernet IONet branches with a discrete terminal board. Capable of managing up to 24 contact inputs and 12 relay outputs, it provides a deterministic interface for binary field signals. By utilizing Software Implemented Fault Tolerance (SIFT), the IS220PDIOH1A supports both simplex and Triple Modular Redundant (TMR) architectures, ensuring that mission-critical digital control loops maintain maximum availability and signal integrity.

Equipment Specifications and Hardware Layout

• Module Function Combined Discrete Input and Relay Output Pack

• System Lineage Mark VIe Distributed Control System (DCS)

• Digital Capacity 24 Contact Inputs and 12 Relay Outputs

• Network Connectivity Dual RJ45 Ethernet ports with 10/100 MB/s auto-negotiation

• Field Interface High-density DC-62 connector for terminal board communication

• Signal Protection Opto-isolated inputs with individual signal conditioning

• Internal Protections Soft-start power sequencing and integrated RFI/EMI shielding

• Diagnostic Tools Onboard LED status indicators and an infrared port for local serial diagnostics

• Physical Mass 0.38 kg

• Footprint 6.0 cm x 13.0 cm x 8.3 cm

• Lifecycle Status Active (Current Production)

• Manufacturing Origin USA

Industrial Operational Scenarios

The IS220PDIOH1A is a standard component for binary signal management in complex industrial automation:

Gas and Steam Turbine ControlMonitoring limit switches, pressure switch contacts, and auxiliary motor feedbacks while simultaneously commanding solenoid valves and trip relays during sequence-of-events processing.

Redundant Safety Logic ExecutionParticipating in TMR (Triple Modular Redundant) voting schemes where three PDIO packs work in parallel to ensure that a single component failure does not lead to an accidental turbine trip or a failure to trip on demand.

Distributed I/O Network ScalingServing as a remote node in a distributed plant architecture, where dual Ethernet IONet ports provide a redundant data path back to the central controller without signal degradation over distance.

Real-Time Diagnostic SupervisionUtilizing board-specific feedback signals to monitor the health of the output relay coils and the integrity of the contact input wiring, allowing for predictive maintenance before a hardware failure occurrs.

Space-Constrained Cabinet OptimizationReplacing separate PDIA and PDOA hardware sets with this dual-purpose module, effectively halving the required cabinet space for discrete signal termination in modern power plant retrofits.