This module is a 24-channel discrete contact input/output (DI/O) module designed for reliable acquisition of dry and wet contact signals in GE Mark VIe control systems. It supports multiple DC voltage levels, redundant system architectures, and advanced diagnostics for use in critical industrial applications.

Technical Specifications
Input Characteristics

Number of channels: 24 independent discrete input channels

Signal type: Dry contact / Wet contact

Supported input voltages:

24 VDC

48 VDC

125 VDC

Terminal board compatibility:

TBCI

TICI

STCI
(DTCI DIN-rail terminal boards not supported)

Isolation and Protection

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

Input filtering: 4 ms hardware filter for high-frequency noise suppression

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

Environmental Conditions

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

Protection level: IP20 (installation inside control cabinet)

Status Indication

LED indicators:

Power

Communication

Channel and module fault status

Core Features
Multi-Voltage Input Compatibility

Supports 24/48/125 VDC discrete inputs, allowing flexible connection to various field contact types. Fully compatible with TBCI / TICI / STCI terminal boards, simplifying system integration and wiring.

Redundancy Support

Compatible with Mark VIe single, dual, and triple-modular redundant (TMR) architectures, enabling redundant configurations with controllers to improve signal acquisition reliability and system availability.

GE IS220PDIAH1A 336A4940CSP1｜MKVIe 24 Discrete Contact in I/O Pack｜

Advanced Diagnostic Capability

Real-time LED indication of module, communication, and channel status, combined with an infrared diagnostic serial port, enables rapid fault detection and localization.

Hot-Swap Capability

Supports live replacement in accordance with system specifications, significantly reducing maintenance downtime and improving operational continuity.

Industrial-Grade Reliability

Designed with industrial-grade components and high EMC immunity, suitable for harsh environments such as power plants and petrochemical facilities, ensuring long-term stable operation.