Description
- Manufacturer: General Electric (GE)
- Part Number: IS220PAOCH1A
- Product Type: PAOC Analog Output I/O Pack
- Platform: GE Mark VIe Control System
- Function: Interface between Mark VIe I/O Ethernet networks and an analog output terminal board
- Analog Outputs: 8 simplex 0-20 mA current outputs
- Ethernet: 2 independent RJ45 Ethernet ports
- Power: 28 VDC input through a 3-pin connector
- Terminal Connection: DC-37 connector to the compatible terminal board
- IR Interface: Front-accessible infrared diagnostic/programming port
- Physical Dimensions: 8.26 × 4.19 × 12.1 cm / 3.25 × 1.65 × 4.78 in (H × W × D), according to the GE system guide.
- Estimated Shipping Weight: Approximately 0.4–0.8 kg depending on packaging; one current commercial listing reports 0.44 kg for the unit.
- What’s in the Box: IS220PAOCH1A I/O pack unless the purchase order specifically includes a terminal board, cables, or documentation.
Product Introduction
The IS220PAOCH1A is the GE Mark VIe PAOC Analog Output Pack, designed to convert controller commands into eight simplex 0-20 mA analog output signals. The pack communicates with one or two I/O Ethernet networks and connects directly to an associated analog output terminal board through its DC-37 interface. GE’s system documentation identifies the PAOC as a distributed I/O pack containing a common processor section and an acquisition-board section dedicated to analog output service.
This revision deserves close attention during replacement. PAOCH1A is not simply interchangeable with every TBAO revision: GE specifies compatibility with the TBAOH1C terminal board and the STAO family, while earlier TBAOH1A/H1B boards can mount physically but do not provide full analog accuracy. The GE guide explicitly states that the PAOC reports a board-compatibility problem with those earlier revisions (a useful distinction when validating warehouse substitutions).
Core Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | General Electric |
| Model | IS220PAOCH1A |
| Marking / Functional Type | PAOC Analog Output |
| System | Mark VIe |
| Output Channels | 8 |
| Output Signal | 0-20 mA |
| Output Configuration | Single-ended, one side connected to common |
| Maximum Load | 900 Ω burden |
| Compliance Voltage | 18 V |
| D/A Resolution | 16-bit |
| Accuracy | ±0.5% over -30 to 65°C and 0-900 Ω load |
| Typical Accuracy | ±0.25% at 25°C and 500 Ω load |
| Frame Rate | 100 Hz on all eight outputs |
| Ethernet Ports | 2 independent 10/100 Ethernet |
| Ethernet Connectors | RJ45 |
| Terminal Interface | DC-37 |
| Power Input | 28 VDC |
| IR Port | Yes |
| PCB Technology | Surface mount |
| Operating Temperature | -30 to +65°C |
| Physical Size | 8.26 × 4.19 × 12.1 cm |
| Power Consumption | A secondary commercial listing reports 7.5 W maximum; treat this value as supplier-reported rather than a controlled GE specification. |
GE also specifies current-feedback monitoring for all eight outputs. A 50 Ω burden resistor on the terminal board, together with a 16-bit ADC, is used to compare measured output current with the commanded value.
Important Thermal Limitation
Do not use 65°C as an unconditional eight-channel operating limit. GE’s thermal table shows that the allowable ambient temperature inside the cabinet must be reduced as channel count and output-loop loading increase. With all eight outputs active, the specified maximum can fall to 45°C at 0 Ω minimum output resistance, rising to 55°C at 500–1000 Ω.
GE IS220PAOCH1A
Global Compliance & Industry Certifications
Certification should be verified against the specific assembly, terminal-board combination, system configuration, and production lot.
- CE Mark: Verify the applicable Mark VIe system conformity documentation for the installed configuration.
- UL / cUL: Confirm the certification applicable to the complete control equipment rather than assuming standalone approval of the I/O pack.
- ATEX / IECEx: Hazardous-area suitability must be established from the approved system configuration and terminal-board combination. Do not classify the I/O pack as independently hazardous-area certified without documentary evidence.
- Marine approvals: DNV or other marine certification requires confirmation for the exact equipment configuration and installation environment.
- EMC / installation compliance: Cabinet grounding, shielding, power distribution, and signal wiring are part of the overall compliance assessment.
Verify specific lot certifications with OEM.
Long-Term Storage & Asset Preservation Guide
- Maintain ESD protection. Store the PAOC inside its original static-protective packaging or an approved ESD bag. Protect the exposed RJ45, DC-37, and power interfaces from contamination.
- Control humidity. A clean, dry warehouse with relative humidity below approximately 60% is preferred. Avoid condensation cycles that can attack connector contacts and exposed metal.
- Inspect before energization. Check the PCB coating, connector condition, mounting hardware, and evidence of moisture or corrosion. Record the part number and revision before installation rather than relying only on the warehouse description.
Physical Installation Prerequisites
- Install the PAOC only with the correct compatible terminal board. GE specifies TBAOH1C and STAO compatibility; earlier TBAOH1A/H1B versions are not acceptable for full specified accuracy.
- Secure the terminal board before attaching the I/O pack.
- Plug the PAOC directly into the terminal-board connector and mechanically secure it using the threaded studs adjacent to the Ethernet connectors.
- Adjust the mounting bracket so that the DC-37 connector is not subjected to right-angle mechanical force. GE specifically calls this out in the installation procedure.
- Connect one or two Ethernet cables according to the system architecture. With dual networking, GE identifies ENET1 as the normal connection to the R-controller network.
- Supply the pack through the specified 28 VDC input.
- Preserve cabinet airflow. The PAOC uses a dense multi-board construction, and GE provides explicit thermal de-rating guidance for loaded analog outputs.
- Before commissioning, confirm output-loop resistance and expected signal range for every channel.
- Capture existing ToolboxST configuration data before replacement. The pack performs electronic-ID matching between the processor, acquisition board, and terminal board during initialization.
Buyer’s FAQ
Q: What HS tariff code should be used for IS220PAOCH1A?
A: Some commercial suppliers quote 85389091, but that should not be treated as a binding classification. The correct code depends on the importing jurisdiction, product function, and local tariff interpretation. Have the customs broker validate the classification before commercial shipment.
Q: What is the country of origin?
A: Commercial listings commonly state USA for this GE part. For an audit-controlled shipment, use the actual unit’s manufacturer marking and a supplier-issued Certificate of Origin or equivalent traceability documentation rather than relying solely on a catalog field.
Q: Does IS220PAOCH1A support redundant Ethernet?
A: Yes. The pack has two independent 10/100 Ethernet ports and can operate using one or two Ethernet inputs. GE states that, with two connections, both paths remain active, and a failure of either network does not interrupt I/O pack operation.
Q: Does it require the latest firmware before commissioning?
A: Do not assume that a replacement unit contains the site’s current approved firmware/configuration. GE documentation states that the pack loads application code from flash, verifies the hardware IDs, and can generate configuration/firmware compatibility alarms. The replacement should therefore be checked against the site’s approved Mark VIe software baseline and ToolboxST configuration before being placed into service.
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