Technical Specifications

FAQ

1. What is the GE IS220PHRAH1A used for?
The GE IS220PHRAH1A is a HART-enabled analog I/O pack designed for the Mark VIe control system. It provides the electrical interface between the I/O Ethernet network and compatible analog terminal boards. The module handles both analog input and analog output signals, making it suitable for process measurement and control applications where transmitters, control valves, and other analog field devices need to be integrated into the Mark VIe system.

2. How many analog channels does the IS220PHRAH1A provide?
The IS220PHRAH1A provides 12 analog channels in total, consisting of 10 analog inputs and 2 analog outputs. Inputs 1 through 8 can be configured for either 4–20 mA current-loop signals or ±5 V voltage signals. Inputs 9 and 10 provide additional current and voltage measurement configurations according to the terminal-board setup.

3. Does the IS220PHRAH1A support HART communication?
Yes. The PHRAH1A is specifically designed as a HART-enabled analog I/O pack. Its analog input and output channels support HART communication, allowing compatible field devices to exchange both process-variable information and digital HART data. This can be useful for remote device diagnostics, configuration, identification, and maintenance without requiring a separate HART interface for every field instrument.

4. Which terminal boards are compatible with the IS220PHRAH1A?
The IS220PHRAH1A is designed to operate with compatible SHRAH-series terminal boards, including SHRAH1A and SHRAH2A configurations. The terminal board provides the field wiring interface and associated signal-conditioning components, while the PHRAH1A performs signal acquisition, conversion, processing, and communication with the Mark VIe control system. The terminal-board selection should match the required field wiring and system configuration.

5. What is the resolution of the analog input section?
The analog input section uses a 16-bit analog-to-digital converter. This provides relatively fine digital resolution for processing 4–20 mA and voltage signals. The input circuits also include hardware filtering and configurable software filtering to reduce electrical noise and improve signal stability in industrial environments.

6. What analog output signals are available on the IS220PHRAH1A?
The module provides two analog outputs, normally used for 4–20 mA process-control signals. The outputs use a 14-bit digital-to-analog converter and can drive loads up to approximately 800 Ω for a 4–20 mA output. Typical applications include sending control signals to valves, actuators, variable-speed equipment, or other analog-controlled devices.

7. How does the IS220PHRAH1A communicate with the Mark VIe control system?
The PHRAH1A uses I/O Ethernet communication through its RJ45 Ethernet ports. It acts as the interface between the Mark VIe control network and the connected analog terminal board. Depending on the system architecture, one or two Ethernet connections can be used. Correct network configuration, terminal-board wiring, module power, and controller configuration are important for reliable operation.

8. What should be checked if the IS220PHRAH1A reports an analog signal fault?
First check the field transmitter or analog device and confirm that its output signal is within the expected range. Then inspect the terminal-board wiring, power supply, Ethernet connections, and configuration of the corresponding analog channel. For a 4–20 mA loop, verify loop continuity, transmitter power, polarity, and burden resistance. If the field signal is correct but the value reported by the control system remains abnormal, check the channel configuration, filtering, communication status, and diagnostic information before replacing the I/O pack.