IS220PHRAH1B, REV C - HART-Enabled Analog I/O Module

SPECIFICATIONS:

Part Number: IS220PHRAH1B, REV C
Manufacturer: General Electric
Series: Mark VIe
Product Type: HART-Enabled Analog I/O Module
Number of channels: 12
Input span: 4-20 mA
Technology: Surface Mount
Input Converter Resolution: 16-bit
Output Converter: 14-bit
Common Mode Voltage Range: ±5 V
Maximum Lead Resistance: 15 Ohms
Analog output current: 0-20 mA
Operating temperature: -30 to 65 °C
Size: 8.26 cm high x 4.19 cm
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

IS220PHRAH1B, REV C is a HART-Enabled Analog I/O Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Control Systems. The HART-Enabled Analog Input/Output (PHRA) pack provides an electrical interface between one or two I/O Ethernet networks and an analog input/output terminal board. The PHRA pack supports up to 10 analog input channels. The first eight inputs can be configured as either 5 V voltage inputs or 4-20 mA current loop inputs. The remaining two inputs can be set as either 4-20 mA or 1 mA current inputs. Load termination resistors for current loop inputs are located on the terminal board, and the PHRA measures the voltage across these resistors.
In addition to inputs, the PHRA includes two outputs for 4-20 mA current loops. When operating in 4-20 mA mode, the PHRA can also transmit HART messages between HART-enabled field devices and an Asset Management System (AMS). Any input or output channel can be used to connect HART-capable field devices.

INSTALLATION:

• To install the PHRA I/O pack, directly connect it to the terminal board using the provided connector.

• Secure the pack mechanically using the threaded studs located beside the Ethernet ports. These studs are designed to fit into a mounting bracket that matches the specific terminal board style.

• Ensure the bracket is positioned to avoid applying direct, straight-angle force to the DC-62 pin connector between the pack and the terminal board. Typically, only one alignment adjustment is needed over the product’s lifespan.

• Depending on your system configuration, connect one or two Ethernet cables. The pack will operate with either port, but when using both, it’s standard practice to connect ENET1 to the network linked to the R controller.

• Power the battery by connecting the side power connector on the pack to a suitable power source. Due to the built-in soft-start feature, which controls current inrush during power-up, it is not necessary to power down before plugging in the cable.

OPERATION:

The processor board interfaces with an acquisition board tailored to the specific function of the I/O pack. When input power is applied, a soft-start circuit gradually increases the voltage supplied to the processor board. The local power supplies are activated in sequence, and the processor reset is released. Following this, the processor performs self-diagnostic tests and loads the appropriate application code for the I/O pack type from flash memory. The application code then verifies the board ID information to ensure it correctly corresponds with the acquisition board and terminal board. If the match is valid, the processor initiates Ethernet communication by requesting a network address.

This address request is handled through the industry-standard Dynamic Host Configuration Protocol (DHCP), using a unique identifier obtained from the terminal board. Once Ethernet initialization is complete, the processor programs the on-board logic, executes the application, and activates the acquisition board. The processor board is standardized across all Mark VIe Ethernet I/O packs or modules and includes the following components:

• High-speed processor with RAM and flash memory
• Two fully independent 10/100 Ethernet ports with connectors
• Hardware watchdog timer and reset circuit
• Internal temperature sensor
• Status-indication LEDs
• Electronic ID and the ability to read IDs on other boards
• Input power connector with soft start/current limiter
• Local power supplies, including sequencing and monitoring

ANALOG INPUT HARDWARE:

The PHRA receives input voltage signals from the terminal board for all ten analog input channels. The analog input section includes an analog multiplexer, multiple gain and scaling options, and a 16-bit analog-to-digital converter (ADC). When configured for current input, the terminal board supplies a 250-ohm burden resistor, which produces a 5 V signal at 20 mA. All analog input signals pass through a second-order passive low-pass filter network, with cutoff frequencies at 12.5 Hz and 48.3 Hz, to reduce noise. In addition to external input signals, the analog input section of the PHRA also monitors internal signals such as voltage feedback from the analog output circuits and calibration voltages.

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FREQUENTLY ASKED QUESTIONS:

How many analog inputs and outputs does the PHRA support?

The PHRA pack supports up to 10 analog inputs. Channels 1 through 8 can be configured either as 5 V voltage inputs or 4–20 mA current loop inputs, depending on the application. Channels 9 and 10 can be set as either 4–20 mA or 1 mA current inputs. In addition to inputs, the PHRA includes two analog output channels, both supporting 4–20 mA current loop operation for sending signals to field devices.

What is the function of the HART-Enabled Analog I/O Module (PHRA)?

The PHRA (Pack HART-Enabled Remote Analog) module serves as a high-performance interface between Ethernet-based I/O networks and analog field instrumentation. It facilitates both analog signal acquisition and transmission, while simultaneously supporting HART digital communication over existing 4–20 mA loops.

How does HART communication integrate with the PHRA module?

The PHRA provides bi-directional HART protocol communication when operating in 4–20 mA mode. This allows digital HART signals to be superimposed over analog current loops, enabling interaction with HART-compliant field devices. The pack acts as a communication conduit, passing HART data to higher-level systems like an AMS (Asset Management System) over Ethernet, facilitating remote device configuration, diagnostics, and calibration without disrupting analog signal integrity.