PDIO IS220PDIOH1A GE Module Parts PDIO Discrete Input/Output Module

The GE IS220PDIOH1A is a PDIO (Discrete Input/Output) I/O Pack designed for the GE Mark VIe turbine control system. It provides an electrical interface between one or two I/O Ethernet networks and a discrete input/output terminal board.

The module consists of a processor board shared across Mark VIe distributed I/O packs and an acquisition board specifically designed for discrete signal processing. The IS220PDIOH1A supports up to 24 contact inputs and controls up to 12 relay output channels. It also receives terminal-board-specific feedback signals for monitoring and control operations.

The module is widely used in gas turbine control, steam turbine automation, power generation, and industrial distributed control systems.

1. Digital Input Acquisition — Receives up to 24 external contact input signals from switches, sensors, limit switches, and other field devices.
2. Relay Output Control — Controls up to 12 relay output channels for operating external equipment and control circuits.
3. Electrical Signal Isolation — Provides 1500 V optical isolation for input signal protection and improved electrical reliability.
4. Ethernet Communication — Connects to one or two I/O Ethernet networks, enabling communication with the Mark VIe controller.
5. Signal Feedback Monitoring — Receives feedback information from the associated terminal board to support accurate system monitoring.
6. Diagnostic Functions — Includes LED indicators, watchdog circuitry, internal temperature monitoring, and local diagnostic communication.
7. Configurable Signal Processing — Supports configurable input logic, signal inversion, filtering, and sequence-of-events recording.