This module is a 24-channel discrete contact input I/O module for the GE Speedtronic Mark VIe control platform. It is designed to acquire dry and wet contact signals with high reliability, multi-voltage compatibility, advanced diagnostics, and full support for redundant control architectures in critical turbine and industrial control applications.

Technical Specifications
Input Characteristics

Number of channels: 24 independent discrete inputs

Signal types: Dry contact / Wet contact

Supported input voltages:

24 VDC

48 VDC

125 VDC

Terminal board compatibility:

TBCI

TICI

STCI

Isolation and Noise Immunity

Electrical isolation:

Channel-to-channel

Channel-to-backplane

Isolation rating: 1500 VAC optical isolation

AC voltage suppression: 60 Vrms (50/60 Hz), preventing false triggering

Signal Conditioning

Hardware input filtering: 4 ms (standard)

Software filtering: Adjustable from 0.5 ms to 100 ms

Communication Interfaces

Ethernet: Dual RJ45 ports (IONet)

Diagnostic interface: Infrared diagnostic serial port

Terminal interface: DC-37 pin terminal board connector

Electrical Characteristics

Power supply:

24 VDC backplane power

Compatible range: 22.8–28 VDC

Typical power consumption: ≤ 4 W

Environmental Conditions

Operating temperature: –40 °C to +70 °C

Protection level: IP20 (installation inside control cabinet)

Status Indication

LED indicators:

Power status

Communication status

Channel normal / fault indication

Core Features
Multi-Voltage Input Adaptation

Supports 24/48/125 VDC discrete inputs and both dry and wet contact signals. Compatible with TBCI, TICI, and STCI terminal boards, allowing flexible adaptation to various field device contact types and wiring practices.

Redundancy Compatibility

Fully supports Mark VIe single, dual, and triple-modular redundant (TMR) architectures. Can be configured redundantly with controllers to improve signal acquisition reliability in mission-critical applications such as power generation and petrochemical plants.

Advanced Diagnostic Capability

LED indicators provide real-time visibility of module, communication, and channel status. The infrared diagnostic serial port enables local diagnostics, allowing rapid identification of wiring errors, channel short circuits, and other faults.

GE IS220PDIH1BD｜Discrete Contact Input I/O Pack｜

Hot-Swap Capability

Supports live replacement in accordance with system specifications, minimizing maintenance downtime and improving overall system availability.

Industrial-Grade Stability

Built with industrial-grade components featuring high vibration resistance and strong electromagnetic interference (EMI) immunity. Designed for long-term stable operation in harsh industrial environments.