GE IS220PIOAH1A ARCNET Interface I/O Module

Function: Position I/O Analog High-Power Pack (PIOAH) — provides high-resolution analog inputs and proportional outputs for actuator and sensor interfacing

Power Supply: 28 V DC nominal

Analog Inputs: 8 channels, 4–20 mA (± 0.1 % accuracy)

Analog Outputs: 4 channels, 0–20 mA (configurable 0–10 V)

Response Time: ≤ 5 ms end-to-end

Ethernet Ports: 2 × 10/100 Mbps RJ-45 (IONet I/O network)

Operating Temperature: –30 °C to +65 °C

Humidity: 5 – 95 % RH non-condensing

Mounting: Surface-mount with conformal-coated PCB

High-Density Analog I/O: Combines multiple precision analog inputs and outputs in a single module

Redundant Network Connectivity: Dual Ethernet ports support simplex, dual-channel, and hot-backup configurations

Auto-Configuration: Plug-and-play module identification and parameter loading from the Mark VIe controller

LED Diagnostics: Front-panel LEDs for link status, power, module health, and channel activity

Rugged Construction: Conformal coating and industrial-grade components for reliable operation in harsh environments

Hot-Swap Capability: Enables live replacement without interrupting the I/O network or control logic

Integrated Filtering: Onboard hardware filtering to suppress electrical noise and ensure stable analog measurements

Hot-Swappable Module: Facilitates maintenance without downtime

Conformal-Coated Electronics: Protects against harsh environmental conditions

Hazardous Area Use: Suitable for deployment in explosive environments and offshore installations

In the 798 MW integrated coal gasification combined cycle unit, the PIOA module provides an ARCNET communication bridge for the excitation control loop, working with the main controller to achieve high-reliability excitation regulation.

This plant has been running continuously for 15+ years without unplanned downtime, and the PIOA Pack ensures real-time interconnection and condition monitoring of the excitation system with the Mark VIe control network.

In the GT13E1 unit reconstruction project, the PIOA module is used for distributed excitation control, achieving higher system availability and maintenance efficiency.