Integrated I/O Capabilities
Integrated Input and Output Functions

Combines PDIA (discrete input) and PDOA (discrete output) functions within a single module, reducing I/O module count, saving installation space, and simplifying system wiring and maintenance. This integrated design is particularly suitable for single-redundancy and space-constrained system architectures.

Redundancy Support

Fully compatible with Mark VIe single, dual, and triple-modular redundant (TMR) system architectures. The module can be configured redundantly with controllers to enhance both signal acquisition and control output reliability, making it well suited for mission-critical applications in power generation and petrochemical industries.

Advanced Diagnostic Capability

Real-time LED indicators display module, communication, and channel status. The built-in infrared diagnostic serial port supports local diagnostics, enabling rapid detection of faults such as:

Field voltage loss

Non-responsive or stuck contacts

Terminal board mismatch

Communication or channel abnormalities

Hot-Swap Capability

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

Industrial-Grade Reliability

Designed with multilayer PCBs and high-reliability surface-mount components. The module offers strong resistance to vibration and electromagnetic interference, ensuring stable long-term operation in harsh industrial environments.

Typical Applications
Gas and Steam Turbine Control Systems

Acquisition of fuel valve status

Inlet guide vane (IGV) limit signals

Safety interlock and protection contacts

Output of discrete commands for valve actuation, motor start/stop, and protection logic
Supports turbine start-up, shutdown, and safety protection sequences.

GE IS220PDIOH1A｜Discrete Contact Input/Output Pack｜

Generator Set Control

Monitoring of circuit breaker status and excitation system switches

Output of control commands such as breaker open/close and fault alarms
Ensures safe and reliable operation of power generation equipment.

Petrochemical and Metallurgical Equipment

Monitoring operating status of compressors and pump units

Output of start/stop commands and interlock protection signals
Enables process monitoring and automated control.

Distributed Control System (DCS) Expansion

Acts as a discrete signal interface node between Mark VIe systems and field devices, suitable for centralized monitoring and control of multiple distributed devices.

environments such as power generation, petrochemical, and heavy industry.