IS220PAOCH1B - Analog Output I/O Module

SPECIFICATIONS:

Part Number: IS220PAOCH1B
Manufacturer: General Electric
Series: Mark VIe
Product Type: Analog Output Module
Number of channels: Eight current output channels
Analog Outputs: 0-20 mA, up to 900 Ohms
Accuracy: ±0.5% over -30º to 65ºC
Size: 8.26 cm high x 4.19 cm wide x 12.1 cm
Availability: In Stock
Country of Origin: USA
Operating Temperature: -30 to 65°C
Size: 8.26 cm high x 4.19 cm wide
Availability: In Stock
Country of Origin: USA
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION OF IS220PAOCH1B:

IS220PAOCH1B is an Analog Output I/O Module designed and manufactured by General Electric as part of the Mark VIe Series used in GE Distributed Control Systems. The PAOCH1B provides the electrical interface between one or two I/O Ethernet networks and an analog output terminal board. The pack contains a processor board common to all Mark VIe distributed I/O packs and an acquisition board pair specific to the analog output function. The pack is capable of providing up to eight simplex 0-20 mA current loop outputs and includes an analog-to-digital converter for current feedback from each output. Input to the pack is through dual RJ45 Ethernet connectors and a three-pin power input. Output is through a DC-37 pin connector that connects directly with the associated terminal board connector. Visual diagnostics are provided through indicator LEDs, and local diagnostic serial communications are possible through an infrared port.

COMPATIBILITY:

PAOCH1B is compatible with the analog output terminal board TBAOH1C and the STAO board, but not the DIN-rail mounted DTAO board. Control mode refers to the number of I/O packs used in a signal path.

• Simplex uses one I/O pack with one or two network connections.
• Dual uses two I/O packs with one or two network connections.
• TMR uses three I/O packs with one network connection on each.

While the PAOC will mount on a TBAOH1A or TBAOH1B terminal board, the pack will not achieve full accuracy of the analog signals due to circuit differences between the terminal board revisions. For this reason, the PAOC is only compatible with the H1C version of TBAO and will report a board compatibility problem with any of the earlier revisions. No physical damage will result if a PAOC is powered up on an older board in error.

OPERATION:

The processor application code contains all the logic necessary to allow the pack to operate from one or two Ethernet inputs. When operated from two Ethernet inputs, both network paths are active all the time. A failure of either network will not result in any disturbance to the I/O pack operation, and the failure will be indicated through the working network connection. This arrangement is more tolerant of faults than a classic hot-backup system where the second port is only used after a primary port failure is detected.

The Ethernet ports on the processor auto-negotiate between 10 MB/s and 100 MB/s speed, and between half-duplex and full-duplex operation. An industry-standard infrared serial communications port is provided on the processor board. Accessible through the pack front, this port provides diagnostic information on the pack status and an ability to program the pack when both Ethernet connections fail. It is possible to communicate with this port using most notebook computers and most hand-held Personal Digital Assistants (PDA).

POWER MANAGEMENT:

The PAOCH1B includes power management in the 28 V input circuit. The management function provides soft start to control current inrush during power application. After applying power, the circuit provides a fast current limit function to prevent a pack or terminal board failure from propagating back onto the 28 V power system. When power is present and working properly, the green PWR indicator will light. If the current limit function operates, the indicator will be out until the problem is cleared.

WHY BUY FROM WOC?

World of Controls supplies GE Distributed Mark VIe automation hardware, including circuit boards, field terminal modules, and processor packs. Available in UNUSED and REBUILT conditions, our components come with warranty coverage to support industrial maintenance and equipment reliability. The GE PAOCH1B and other refurbished units undergo detailed technical inspection and functional testing to verify their condition before shipment. We also offer diagnostic troubleshooting, component repair, and exchange programs to help restore faulty hardware and reduce unplanned plant downtime. Our technical specialists provide 24/7 assistance with part identification, system compatibility, inventory confirmation, and urgent procurement requirements. Contact our sales team for competitive pricing, service options, and reliable worldwide shipping.

FREQUENTLY ASKED QUESTIONS:

What is the GE IS220PAOCH1B?

The IS220PAOCH1B is a Mark VIe analog output I/O pack manufactured by General Electric for industrial turbine control and distributed control applications. It interfaces with one or two I/O Ethernet networks and an analog output terminal board to deliver up to eight simplex current-loop outputs. The module also monitors output current through feedback circuitry, supporting signal verification and fault diagnosis.

What are the analog output capabilities of this module?

The module provides eight current output channels with a nominal range of 0–20 mA and supports loads up to 900 ohms. Its specified accuracy is ±0.5% over an operating temperature range of -30°C to 65°C. These outputs can interface with compatible field devices that accept current-loop control signals.

Which terminal boards are compatible with the IS220PAOCH1B?

The module is compatible with the TBAOH1C analog output terminal board and the STAO board. It is not compatible with the DIN-rail-mounted DTAO board. Although the pack can physically mount on earlier TBAOH1A and TBAOH1B revisions, those boards do not provide the required circuit compatibility for full signal accuracy.

How does the module maintain communication during an Ethernet failure?

The module can operate using one or two I/O Ethernet network connections. When both network paths are connected, they remain active simultaneously, allowing the pack to continue operating if one network path fails. The remaining functional connection can report the network fault, helping maintenance personnel identify communication issues without unnecessarily interrupting I/O operation.

How is output current monitored?

The acquisition circuitry includes feedback measurement for each current output channel. This feedback allows the control system to monitor the delivered output current and helps technicians investigate discrepancies between commanded and measured signals. Actual troubleshooting should also consider field wiring, terminal board compatibility, external loads, and the connected device.

What diagnostic features are available on the module?

The module provides front-facing LED indicators for status monitoring and an infrared serial communication interface for local diagnostics. The serial interface can provide access to status information and programming functions when Ethernet communication is unavailable. These features assist technicians in identifying power, communication, and module-level faults.

What does the PWR indicator indicate?

The green PWR LED indicates that the module's power supply is present and operating properly. The integrated power-management circuit provides soft-start control and fast current limiting on the 28 V input. If current limiting activates, the PWR indicator remains off until the underlying problem is cleared.