The GE Fanuc IS220PAOCH1A is a high-reliability Analog Output (PAOC) processor module developed for the GE Speedtronic Mark VIe control system. This specialized functional module serves as a critical interface between the control system’s digital processing layer and industrial field actuators, such as control valves, guide vanes, and positioning systems. The IS220PAOCH1A receives digital control signals from the controller via dual Ethernet channels, converts them into precise analog outputs, and monitors the loop feedback to ensure exact system response. Engineered for high-availability applications like gas and steam turbine control, it supports redundant configurations to maximize plant uptime and features comprehensive internal diagnostics to detect open circuits, short circuits, and calibration drift instantly.
Product Specifications and Datasheet
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Manufacturer: GE Fanuc / General Electric
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Model Identifier: IS220PAOCH1A
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System Series: Speedtronic Mark VIe (MK VIe)
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Module Type: Analog Output (PAOC) Pack
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Number of Channels: 8 analog output channels
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Output Signal Range: 0-20 mA or 4-20 mA (software configurable per channel)
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Ethernet Ports: Two 100Base-TX RJ-45 connectors for IONet redundancy
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Operating Voltage: 28 V DC nominal (range of 18 V DC to 32 V DC)
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Current Consumption: 0.5 A maximum
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Microprocessor Type: 32-bit RISC processor
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Ambient Operating Temperature: -30°C to +65°C (-22°F to 149°F)
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Storage Temperature Range: -40°C to +85°C (-40°F to 185°F)
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Physical Dimensions: 153 mm Height x 45 mm Width x 123 mm Depth
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Net Weight: 0.68 kg (1.5 lbs)
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Country of Origin: United States
Applications
The GE Fanuc IS220PAOCH1A is predominantly utilized in heavy industrial power generation and mechanical drive systems governed by the Mark VIe platform. It is highly deployed in Gas Turbine Control Systems to regulate fuel control valves, water/steam injection valves, and variable inlet guide vanes. In Steam Turbine Operations, it manages governor and intercept valves to maintain correct turbine speed and load. Additionally, this module is widely applied in Combined Cycle Power Plants, Oil and Gas Compression Stations, and large-scale Petrochemical Refineries where continuous, fault-tolerant process control of variable speed drives and electro-hydraulic actuators is absolutely mandatory.
User Instructions and Operation Guide
Installation must be performed by certified control technicians within an ESD-protected and climate-controlled enclosure. The IS220PAOCH1A mounts directly onto a compatible Mark VIe terminal board (such as the TBAOH1C or TBAOH1D) via a high-density sub-D connector interface. Secure the module firmly using its integrated retention screws to guarantee a stable electrical ground and connection integrity.
Connect the dual IONet Ethernet cables to the designated RJ-45 ports to establish redundant communication with the control network. Ensure the field wiring connected to the terminal board is properly shielded, with the shields grounded only at the designated points on the terminal base to mitigate electromagnetic interference.
When power is initialized, monitor the module’s diagnostic LEDs. A solid green “Power” LED and a flashing green “Online” LED indicate a healthy status and successful network synchronization. Configuration, including channel assignment and current loops (0-20mA vs 4-20mA), must be completed via the GE ToolboxST software platform. Never unplug the module from the terminal board while field loops are actively energized to prevent damaging the sensitive digital-to-analog converter (DAC) circuitry.
Frequently Asked Questions
Q: Does the IS220PAOCH1A support TMR (Triple Modular Redundancy)? A: Yes. When paired with a TMR-capable terminal board, three separate IS220PAOCH1A modules can be connected together to vote on the analog output signals, ensuring uninterrupted operation even if one control pack suffers a total hardware failure.
Q: What does a steady amber “Fault” LED on the module front panel indicate? A: An amber or red fault light typically signals a hardware configuration mismatch, a loss of communication on both IONet ports, or an internal diagnostic failure during power-on self-test (POST). Connect through ToolboxST to retrieve the specific fault log entry.
Q: Can this module detect a broken wire or open loop in the field? A: Yes. The module features integrated loop readback diagnostics. If a field wire breaks or an actuator coil goes open circuit, the module detects that current is not flowing properly and reports an “Open Loop” diagnostic alarm to the master HMI.
Product Industry News
With global energy markets focusing heavily on grid stability and fast-start capabilities, power plants are upgrading legacy Speedtronic Mark V and Mark VI systems to the modern Mark VIe platform. Control engineering firms report a steady rise in lifecycle optimization projects utilizing parts like the IS220PAOCH1A. Turbine operators are choosing to update individual I/O packs and processors rather than undergoing complete control system overhauls. This targeted modernization strategy allows utility providers to gain advanced Ethernet-based diagnostics and cyber-security enhancements while avoiding the prohibitive costs and extended shutdowns associated with full control cabinet replacement.
