GE IS220PHRAH1A HART Analog I/O Pack for Gas and Steam Turbine Systems

Brand GE

Model GE IS220PHRAH1A HART-STOCK

Product Overview

The GE IS220PHRAH1A is a HART-enabled analog input/output pack developed for the GE Mark VIe and Mark VIeS Speedtronic turbine control platforms. It provides the direct electrical interface between field analog instrumentation and the control system’s I/O Ethernet network. With ten analog input channels and two analog output channels, the GE IS220PHRAH1A supports continuous signal acquisition and closed-loop control for gas turbine, steam turbine, generator, and balance-of-plant applications.

The module’s functional acronym is PHRA, which identifies it as a HART analog I/O pack. It is designed to mount directly to a compatible Mark VIe terminal board through a high-density DC-62 connector. The terminal board provides field wiring termination and associated signal-path components, while the GE IS220PHRAH1A performs analog-to-digital conversion, digital-to-analog conversion, signal conditioning, HART communication, diagnostics, and I/O-network data exchange.

A key feature of the GE IS220PHRAH1A is its ability to support standard 4–20 mA analog signals while simultaneously enabling HART communication on the same loop. This allows the control system and compatible asset-management applications to exchange digital device information with smart field instruments without requiring separate communication wiring. The pack supports dual 10/100 Mbps Ethernet ports for connection to redundant I/O networks, helping maintain communication continuity in high-availability control architectures.

The GE IS220PHRAH1A is typically applied in simplex, dual, or redundant Mark VIe configurations. Its combination of mixed analog input and output capability, HART support, deterministic network communication, and industrial operating specifications makes it suitable for both new turbine-control projects and spare-part replacement in operational plants.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	IS220PHRAH1A
Functional Acronym	PHRA
Manufacturer	GE
Product Type	HART Analog Input/Output Pack
Compatible Systems	GE Mark VIe and Mark VIeS
Analog Inputs	10 channels
Analog Outputs	2 channels
Input Channels 1–8	4–20 mA or ±5 V
Input Channels 9–10	4–20 mA or ±1 mA
Output Signal Range	0–20 mA or 4–20 mA
Input Resolution	16-bit A/D conversion
Output Resolution	14-bit D/A conversion
Communication	HART, IONet over dual Ethernet
Ethernet Ports	2 × 10/100 Mbps RJ45 ports
Terminal Board Interface	DC-62 connector
Supported Terminal Boards	SHRAH1A, SHRAH2A
Typical Scan Time	5 ms
Measurement Accuracy	Better than 0.1% of full scale
Input Power	28 VDC nominal
Operating Temperature	-30°C to +65°C
Form Factor	Mark VIe I/O pack
Hazardous Area Rating	Class I Division 2, ATEX Zone 2

Main Features and Advantages

The GE IS220PHRAH1A combines analog input and output functionality in one compact Mark VIe I/O pack. Channels 1 through 8 can be configured for 4–20 mA current loops or ±5 V signals, while channels 9 and 10 support additional current and voltage configurations. The two output channels provide 0–20 mA or 4–20 mA control signals for valves, actuators, and other analog final control elements. This mixed-signal design reduces the number of packs and terminal boards required in many turbine-control applications.

HART integration is one of the most valuable capabilities of the GE IS220PHRAH1A. The pack supports HART communication on its analog channels, allowing digital device data to be carried over the same wiring used for conventional 4–20 mA signals. This enables compatible host systems and asset-management software to read device diagnostics, verify configuration, and perform maintenance functions without interrupting the analog process variable.

Signal accuracy and noise immunity are supported by 16-bit analog-to-digital conversion, 14-bit digital-to-analog conversion, hardware low-pass filtering, and common-mode rejection. The GE IS220PHRAH1A also provides onboard diagnostics to support fault detection and troubleshooting. Together, these features help maintain measurement quality in electrically noisy turbine environments.

The dual Ethernet architecture allows the GE IS220PHRAH1A to connect to redundant I/O control networks. Front-panel indicators provide visual status information for power, HART communication, network activity, and attention conditions. When paired with the correct terminal board and configured through the appropriate Mark VIe engineering tools, the pack delivers a stable and serviceable interface between field instrumentation and turbine-control logic.