GE IS220PAICH1A Analog I/O Pack Mark VI Series

June 15, 2026 • 3 min read • wayne • BLOG

Product Summary

The IS220PAICH1A Analog I/O Pack is a critical module for General Electric Mark VI Series systems. This device operates reliably in hazardous and non-hazardous locations. It integrates seamlessly with triple modular redundant architectures for maximum uptime. The unit processes analog signals with precise voltage and current specifications. Engineers use it to ensure safe and efficient turbine control applications.

Expert Technical Evaluation & Performance Review

Hazardous Location Certifications and Safety

The IS220PAICH1A holds multiple certifications for diverse industrial environments. It is certified for Class I Zone 2 Group IIC hazardous locations. The pack also meets Class I Division 2 Groups A, B, C, and D standards. Its ATEX Zone 2 Group IIC certification ensures European compliance. The UL E207685 certification applies to numerous installation locations. The UL DEMKO 12 ATEX 1114875X certification adds further global validity. These credentials make the module safe for volatile gas environments.

Core Voltage and Current Specifications

The module operates on a power supply voltage of 28.6 V dc with a 0.49 A dc current draw. Inputs one through eight accept a maximum voltage of 10 V dc. These inputs handle a maximum current of 20 mA dc. Inputs nine and ten use a maximum voltage of 5 V dc with the same current limit. The outputs provide a maximum voltage of 16.3 V dc at 20 mA dc. The analog transmitter channel outputs a max voltage of 25.2 V dc at 21 mA dc.

Triple Modular Redundant Architecture Integration

This I/O pack works specifically within a triple modular redundant (TMR) system. The TMR setup includes an individual control module, I/O net, and main processor card. The IS220PAICH1A typically resides in a thirteen or twenty-one slot VME rack. This placement allows for high-density signal processing in critical control loops. The TMR architecture provides fault tolerance for essential turbine operations. The module supports the system's need for continuous, uninterrupted performance.

Functional Revision and Hardware Design

The IS220PAICH1A is the sole A-rated functional revision of its series. Its parent model, the IS220PAICH1, lacks this advanced revision. The product number indicates a conformal protective coating on the PCB. This coating guards against moisture, dust, and chemical contaminants. The module belongs to group one of the Mark VI Series product grouping. This design ensures compatibility with existing Mark VI system components.

Compatible Terminal Board Models

The IS220PAICH1A requires a specific input-output terminal board for field wiring. Compatible models include the IS200STAIH1A and IS200STAIH2A terminal boards. The IS20TBAIH1C model also works perfectly with this I/O pack. These boards connect field sensors and actuators to the analog pack. They simplify wiring and improve signal integrity for the system.