Description
IS220PDIOH1A Product Overview
The IS220PDIOH1A is a “pack” style I/O module used inside GE Mark VIe Speedtronic turbine and compressor control cubicles. It combines 24 discrete inputs and 12 Form-C relay outputs on one card, adds dual 100 Mb full-duplex Ethernet ports, and embeds a local processor so that field status changes are time-stamped and transmitted to the controller at wire speed.
The IS220PDIOH1A is a “pack” style I/O module used inside GE Mark VIe Speedtronic turbine and compressor control cubicles. It combines 24 discrete inputs and 12 Form-C relay outputs on one card, adds dual 100 Mb full-duplex Ethernet ports, and embeds a local processor so that field status changes are time-stamped and transmitted to the controller at wire speed.
In the automation hierarchy the card sits at the “field I/O & communication” layer: it mounts on a Mark VIe terminal board (TDBS for simplex or TDBT for TMR redundant loops) and converts dry-contact or 24 VDC field signals into digital codes that the turbine-control CPU consumes every scan. The on-board CPU also runs local diagnostics, so broken wires, relay coil shorts, or Ethernet link loss are reported immediately—essential for overspeed protection or fire-gas loops where a missed input can trip the unit.
Because the module is certified for hazardous locations and stores its personality in flash, it is accepted in Zone 2 compressor stations and off-shore platforms without additional barriers.
GE IS220PDIOH1A
Technical Specifications
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Model Number: IS220PDIOH1A
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Manufacturer: General Electric
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Product Type: Discrete Input / Output Pack Module
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I/O Count: 24 digital inputs + 12 relay outputs (Form-C)
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Field Voltage: 24 VDC nominal (12–48 VDC input range)
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Ethernet: Dual 100 Mb full-duplex RJ45 ports with on-board switch
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Local CPU: Embedded processor for data acquisition, filtering, and diagnostics
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Isolation: 1500 V optical between field and logic
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Power: 24 VDC @ typ. 300 mA (module derives power from terminal board)
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Indicators: Power, Ethernet link/activity, relay status, fault (front-panel LEDs)
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Terminal Boards: TDBS (simplex) or TDBT (TMR) hazardous-location approved
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Temperature: -20 … +50 °C operational; -40 … +70 °C storage
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Weight: ≈ 120 g
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Dimensions: ≈ 170 × 105 × 32 mm
GE IS220PDIOH1A
Core Features & Customer Value
Dual Ethernet on-board – Two 100 Mb ports with internal switch eliminate external hubs and give redundant network paths for turbine-protection data, cutting cabling cost and failure points.
Dual Ethernet on-board – Two 100 Mb ports with internal switch eliminate external hubs and give redundant network paths for turbine-protection data, cutting cabling cost and failure points.
24 DI + 12 DO in one pack – High-density layout replaces two separate I/O cards, freeing Mark VIe slots and reducing spare-part count while keeping the same 24 V logic levels used throughout the turbine skid.
Local CPU & diagnostics – On-board processor time-stamps input edges and validates relay continuity, so broken wires or welded contacts are reported immediately—essential for overspeed or fire-gas protection loops.
Hazardous-location approval – Module and mating terminal boards are certified for Zone 2 / Class I Div 2, so you can land field wires directly without additional isolation barriers, saving panel space and installation time.
Pack form factor – Plugs straight onto TDBS/TDBT terminal boards; no external 24 V wiring, no DIP switches, and identical mechanical envelope across all Mark VIe packs, simplifying maintenance and sparing.
Typical Applications
In combined-cycle power plants the IS220PDIOH1A is installed in the “auxiliary I/O” section of Mark VIe panels that govern gas turbines. It reads 24 V status from auxiliary lube-pump contactors, cooling-fan flow-switches, and fire-gas detectors while driving 12 relay outputs that energise lock-out valves and alarm horns— all on one card.
In combined-cycle power plants the IS220PDIOH1A is installed in the “auxiliary I/O” section of Mark VIe panels that govern gas turbines. It reads 24 V status from auxiliary lube-pump contactors, cooling-fan flow-switches, and fire-gas detectors while driving 12 relay outputs that energise lock-out valves and alarm horns— all on one card.
In pipeline compressor stations the same pack monitors 24 VDC limit-switch positions and drives 24 V solenoid valves for anti-surge control, using the dual Ethernet ports to publish real-time data to the station DCS over Modbus TCP.
Because the module is certified for marine and Zone 2 environments, it is also used on off-shore platforms for well-head valve position feedback and fire-pump starter control without needing additional isolation relays.
