This module is a 16-channel isolated discrete contact input I/O module for the GE Speedtronic Mark VIe control system. It is designed to reliably acquire dry and wet contact signals across both DC and AC voltage levels, providing high isolation, strong noise immunity, redundancy support, and advanced diagnostics for critical industrial applications.

Technical Specifications
Input Characteristics

Number of channels: 16 independent isolated discrete inputs

Signal types: Dry contact / Wet contact

Supported input voltages:

24 VDC

115 VAC

230 VAC

Terminal board compatibility:

TBCI

TICI

STCI

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

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

Environmental Conditions

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

Protection level: IP20 (installation inside control cabinet)

Conformal coating: Three-proof coating (moisture-proof, dust-proof, corrosion-resistant)

Status Indication

LED indicators:

Power status

Communication status

Channel normal / fault indication

Module status

Core Features
Multi-Voltage Input Compatibility

Supports 24 VDC, 115 VAC, and 230 VAC discrete inputs, enabling direct connection to a wide range of field contact signals. Compatible with TBCI / TICI / STCI terminal boards for flexible system configuration.

High Isolation and Noise Immunity

1500 VAC optical isolation effectively blocks field interference, ensuring accurate and reliable signal acquisition in environments with strong electromagnetic interference.

Redundancy Support

Fully compatible with Mark VIe single, dual, and triple-modular redundant (TMR) architectures. The module can operate in redundant configurations with controllers to improve signal acquisition reliability in mission-critical systems.

Advanced Diagnostic Capability

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

GE IS220PDIIH1B 336A5026ADP1｜Isolated 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 Reliability

Designed with multilayer PCBs and surface-mount components, featuring high vibration resistance (up to 5 G) and strong EMI immunity. Suitable for long-term operation in harsh industrial environments such as power generation, petrochemical, and heavy industry.