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GE IS220PDOAH1A

Product Name: Mark VIe 12-Channel Relay Output Pack (Discrete Output Pack)
Product Overview: 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 pack sits at the “field-actuator” layer, receiving output commands over the I/O Ethernet network, time-stamping the data, energizing the appropriate relays, and returning contact-status feedback to the controller.
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Detailed content

Key Specifications:
  • Outputs: 12 Form-C relay contacts
  • Field Voltage: 24 VDC nominal (12–48 VDC/AC supported)
  • Load Current: 3 A per channel max, 4 A total (field-fused)
  • Logic Supply: 24 VDC via 3-pin backplane feed
  • Response Time: ≈ 6 ms (Ethernet command to contact closure)
  • Ethernet: Dual 100 Mb full-duplex RJ45 ports with on-board switch
  • Isolation: 1500 V optical between field and logic
  • Diagnostics: Front-panel LEDs, infrared serial port for local interrogation
  • Terminal Boards: Compatible with TRLYH1B/C/D/F (magnetic relays) or TRLYH1E (solid-state)
  • Operating Temperature: –40°C to +70°C (variant dependent)
  • Storage Temperature: –55°C to +85°C
  • Relative Humidity: 5%–95% non-condensing
  • Weight: 120 g (some configurations up to 640 g)
  • Dimensions: 3.25″ H × 1.65″ W × 4.78″ D
  • Memory: Flash and RAM
  • LEDs: Four (Power, Attention, TxRx, Link)
  • Hazardous Location: Certified for Zone 2
Core Features:
  • 12-relay density: one pack replaces multiple interposing relays, freeing Mark VIe slots
  • Dual Ethernet redundancy: two 100 Mb ports with internal switch for redundant network paths
  • On-board processor & diagnostics: local CPU time-stamps commands and validates contact status — welded relays or open coils are reported immediately (essential for overspeed or fire-gas protection loops)
  • TRLY terminal-board compatibility: plugs straight onto TRLY boards, no external 24 V wiring beyond the terminal board
  • Zone 2 / marine certification: can be landed in hazardous locations without additional isolation barriers
Application Scenarios:
  • Combined-cycle power plants: installed in the “auxiliary output” section of Mark VIe panels governing gas turbines
  • Drives 24 VDC lock-out valves, cooling-fan contactors, and fire-protection solenoids while reporting contact status back to the turbine controller
  • Compressor stations and offshore platforms (Zone 2 certified)
Installation & Usage Notes:
  • Plugs directly onto a Mark VIe terminal board (TRLYH1B/C/D/F for magnetic relays or TRLYH1E for solid-state)
  • No external 24 V wiring required beyond the terminal board
  • Transformer-isolated logic keeps the 24 VDC field side separate from the 5 V backplane
  • Use front-panel LEDs and infrared port for local diagnostics
  • Verify relay assignments and field voltage (12–48 VDC/AC) match application before energizing

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