The GE IS220PDOAH1A (PDOA) is a high-performance Discrete Output I/O Pack designed for the Mark VIe control system. While often referred to in the industry as a “processor module” due to its onboard high-speed CPU, its primary function is to act as the electrical interface between the controller’s Ethernet-based I/O network and discrete output terminal boards. It converts digital commands from the control processors into physical relay actions.
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Technical Description and Parameters
The PDOA pack is a self-contained unit featuring an embedded processor board and a specialized acquisition board. It supports high-speed data processing and includes non-volatile flash memory for application code.
- Module Type: Discrete Output (Relay) I/O Pack
- Series: Mark VIe (Speedtronic)
- Processor: High-speed processor with RAM and 128 MB Flash memory
- Output Channels: Controls up to 12 relays
- Response Time: Approximately 6 ms (Ethernet command to output)
- Ethernet Ports: 2 x RJ45 10/100 Mbps (Redundant network support)
- Power Supply: 28V DC nominal (via 3-pin connector)
- Feedback: Accepts terminal board-specific feedback for relay state monitoring
Physical Characteristics and Hardware
- Dimensions: 8.26 cm (H) x 4.19 cm (W) x 12.1 cm (D)
- Weight: 0.5 kg (approx. 1.1 lbs)
- Interface: Connects directly to terminal boards via a DC-37 pin connector
- Indicators: 4 Status LEDs (Power, Attention, TxRx, Link)
- Coating: Conformal PCB coating for protection against humidity and dust
Application Fields
The IS220PDOAH1A is a standard component in GE’s distributed gas turbine control systems:
- Turbine Control: Operating hydraulic solenoids, fuel valves, and ignition circuits.
- Power Generation: Managing circuit breaker tripping and status signaling.
- Industrial Sequencing: Controlling motors, pumps, and fans in large-scale manufacturing.
- Safety Interlocks: Managing discrete safety signals in complex industrial processes.
Product Instructions for Use
- Mounting: Plug the I/O pack directly into the DC-37 connector of a compatible terminal board (e.g., TRLY or SRLY). Secure it using the threaded studs to avoid mechanical stress on the connector.
- Ethernet Wiring: Connect one or two Ethernet cables. In redundant systems, connect ENET1 to the network associated with the primary (R) controller.
- Power Application: The module features soft-start capability, allowing you to plug in the power connector even while the cable is live; it will automatically manage inrush current.
- Configuration: Use ToolboxST to configure the PDOA pack. The module will perform an internal self-test and verify the Electronic ID of the terminal board before becoming operational.
Q&A: Frequently Asked Questions
Q: What is the “Output Enable” feature? A: This is a safety mechanism that keeps all outputs disabled during power-up until internal self-tests are completed. It ensures relays don’t “flicker” or trip accidentally during system initialization.
Q: Can I use this with solid-state relays? A: Yes. It is compatible with TRLYH1B, C, D, and F boards for electromagnetic relays and TRLYH1E for solid-state relays.
Q: Does it support TMR (Triple Modular Redundancy)? A: Yes. You can install three PDOA packs on a TMR-capable terminal board for high-reliability applications where a single point of failure must not trip the process.
Related Product News
As industrial facilities move toward more integrated digital twins, GE Vernova has enhanced the diagnostic reporting of the Mark VIe series. The IS220PDOAH1A now benefits from advanced Asset Performance Management (APM) integration, allowing the processor to report not just the “on/off” state, but also health metrics related to relay coil health and switching cycles. This helps maintenance teams predict relay wear-out before a failure occurs. Recent 2026 firmware updates also include improved cybersecurity protocols for the I/O network, hardening the PDOA pack against unauthorized network access in satellite-connected or distributed control environments.
