Description
IS220PDOAH1A Product Overview
The IS220PDOAH1A is a “pack-style” discrete output module used inside GE Mark VIe Speedtronic turbine and compressor control cubicles. It combines 12 relay outputs (Form-C contacts) with an embedded processor and dual 100 Mb Ethernet ports on one card, allowing the controller to drive medium-power field devices without external interposing relays.
The IS220PDOAH1A is a “pack-style” discrete output module used inside GE Mark VIe Speedtronic turbine and compressor control cubicles. It combines 12 relay outputs (Form-C contacts) with an embedded processor and dual 100 Mb Ethernet ports on one card, allowing the controller to drive medium-power field devices without external interposing relays.
In the automation hierarchy the pack sits at the “field-actuator” layer: it receives output commands over the I/O Ethernet network, time-stamps the data, energises the appropriate relays, and returns contact-status feedback to the controller. A local serial port (infrared) and front-panel LEDs provide on-site diagnostics, while transformer-isolated logic keeps the 24 VDC field side separate from the 5 V backplane.
The module plugs straight onto a Mark VIe terminal board (TRLYH1B/C/D/F for magnetic relays or TRLYH1E for solid-state relays), so no external 24 V wiring is required beyond the terminal board. Because the pack is certified for Zone 2 hazardous locations, it is accepted in compressor stations and off-shore platforms without additional barriers.
GE IS220PDOAH1A
Technical Specifications
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Model Number: IS220PDOAH1A
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Manufacturer: General Electric
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Product Type: Discrete Output Pack (PDOA)
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Outputs: 12 Form-C relay contacts
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Field Voltage: 24 VDC nominal (12–48 VDC/AC supported)
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Load Current: 3 A per channel max, 4 A total (field-fused)
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Logic Supply: 24 VDC via 3-pin backplane feed
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Response Time: ≈ 6 ms Ethernet command to contact closure
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Ethernet: Dual 100 Mb full-duplex RJ45 ports with on-board switch
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Isolation: 1500 V optical between field and logic
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Diagnostics: Front-panel LEDs, infrared serial port for local interrogation
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Terminal Boards: TRLYH1B/C/D/F (magnetic relays) or TRLYH1E (solid-state)
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Temperature: -40 … +70 °C operational (variant dependent)
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Weight: ≈ 120 g
Core Features & Customer Value
12-relay density – One pack replaces multiple interposing relays, freeing Mark VIe slots and reducing spare-part count while keeping the same 3 A per-channel capability.
12-relay density – One pack replaces multiple interposing relays, freeing Mark VIe slots and reducing spare-part count while keeping the same 3 A per-channel capability.
Dual Ethernet redundancy – Two 100 Mb ports with internal switch give redundant network paths for turbine-protection data, eliminating external hubs and cutting cabling cost.
On-board processor & diagnostics – Local CPU time-stamps commands and validates contact status, so welded relays or open coils are reported immediately—essential for overspeed or fire-gas protection loops.
TRLY terminal-board compatibility – Plugs straight onto TRLYH1B/C/D/F or TRLYH1E boards; no external 24 V wiring beyond the terminal board, simplifying installation and maintenance.
Zone 2 / marine certification – Module and mating terminal boards are certified for hazardous locations, so you can land field wires directly without additional isolation barriers.
GE IS220PDOAH1A
Typical Applications
In combined-cycle power plants the IS220PDOAH1A is installed in the “auxiliary output” section of Mark VIe panels that govern gas turbines. It drives 24 VDC lock-out valves, cooling-fan contactors, and fire-protection solenoids while reporting contact status back to the turbine controller—all on one card.
In combined-cycle power plants the IS220PDOAH1A is installed in the “auxiliary output” section of Mark VIe panels that govern gas turbines. It drives 24 VDC lock-out valves, cooling-fan contactors, and fire-protection solenoids while reporting contact status back to the turbine controller—all on one card.
In pipeline compressor stations the same pack energises 24 VDC anti-surge solenoid valves and indicator lamps, using the high-density layout to minimise marshalling cabinet footprint.
Because the pack is certified for marine and Zone 2 environments, it is also used on off-shore platforms for well-head valve control and fire-pump starter feedback without needing additional isolation relays.
