The GE IS220PDOAH1A, also cataloged as the IS220PDOA Discrete Output Pack, operates as a dedicated hardware component for discrete relay output control and feedback monitoring within GE Mark VIe control networks. Mounted directly to compatible terminal boards such as SRLY and TRLY, the module drives up to 12 solid-state or electromagnetic relays across dual redundant RJ45 Ethernet communication channels powered by a 28 VDC supply.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IS220PDOAH1A |
| Brand | General Electric (GE) |
| Series | Mark VIe |
| Product Type | Discrete Output Pack |
| Dimensions | 3.25 in H x 1.65 in W x 4.78 in D |
| Power Consumption | 28 VDC nominal input |
| Relay Channels | 12 |
| Ethernet Ports | 2x RJ45 connectors |
| Connectors | 3 (1x DC power connector, 2x RJ45 Ethernet) |
| Memory | Flash memory and RAM |
| Compatible Terminal Boards | SRLY, TRLYH1B, TRLYH1C, TRLYH1D, TRLYH1E, TRLYH1F |
| LED Indicators | 4x (Power, Attention, TxRx, Link) |
Firmware Flash Compatibility and Output Execution Logic
The IS220PDOAH1A utilizes onboard Flash and RAM memory to maintain local firmware execution and parameter storage. Dual RJ45 Ethernet ports handle deterministic IONet network communications, transmitting command signals to the processor board embedded within the pack. Internal logic features an independent hardware output enable mechanism that keeps all 12 relay channels dropped out during startup, holding the outputs in a disabled state until all power-up self-tests successfully clear.
Frequently Asked Questions
Q: How does the IS220PDOAH1A prevent unintended relay coil energization during system initialization?
A: Internal hardware logic enforces an output disable state during power-up, keeping all 12 relay channels de-energized until internal self-test routines are fully completed.
Q: Which terminal boards support solid-state versus electromagnetic relays with this pack?
A: Solid-state relays are driven through TRLYH1B, C, D, and F terminal boards, while electromagnetic relays interface via TRLYH1E terminal boards.
Q: What status information do the four front-panel LEDs convey?
A: The LEDs report real-time module operational states: Power indicates DC voltage input, Attention signals fault or diagnostic conditions, TxRx indicates active network data transmission, and Link confirms physical Ethernet link integrity.
Field Installation Guidelines
- Isolate and lock out the 28 VDC power source feeding the mounting terminal board before installing the pack.
- Put on an electrostatic discharge (ESD) grounding wrist strap prior to removing the IS220PDOAH1A from its conductive packaging.
- Align the multi-pin DC connector and mechanical standoffs on the pack with the mating receptacles on the SRLY or TRLY terminal board.
- Press the pack firmly onto the terminal board until fully seated, then hand-tighten the mounting screws to secure the chassis.
- Connect dual RJ45 Ethernet cables to ports 1 and 2, ensuring connector latches engage securely before applying power.
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