IS220PDOAH1A
IS220PDIOH1B
IS220PDIOH1B
IS220PDIOH1B
IS220PDIOH1B

GE IS220PDIOH1A | Combined Discrete I/O Pack for Mark VIe – Field Notes

  • Model: IS220PDIOH1A
  • Alt. P/N: 336A4940CSP23 (internal board P/N)
  • Product Series: GE Speedtronic Mark VIe
  • Hardware Type: Packaged Discrete Input/Output (PDIO) Module
  • Key Feature: 24 optically isolated inputs, 12 relay outputs, on-board processor
  • Primary Field Use: Reads field contacts and drives actuators in turbine control/SIS loops
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Part number: GE IS220PDIOH1A
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Description

Hard-Numbers: Technical Specifications

  • Protocol Support: IONet (Mark VIe proprietary), 100Mbps Ethernet
  • Port Count: 2× RJ45 Ethernet, 1× DC-37 field I/O connector
  • Input Channels: 24 discrete, dry contact / 5–24V DC compatible
  • Output Channels: 12 Form C relays, 5A @ 250V AC / 30V DC
  • Isolation Rating: 1500 VAC optical (field-to-backplane)
  • Input Filter: 4 ms hardware debounce
  • Power Draw: 3.5 W typical; 28.0 VDC nominal input
  • Operating Temperature: -20°C to +65°C
  • Storage Temperature: -40°C to +70°C
  • Dimensions: 158.75 × 107.95 × 30 mm (W×H×D)
  • Weight: 0.8 kg
  • Hazardous Rating: Class I Div 2, Zone 2 approved
IS220PDIOH1B

IS220PDIOH1B

The Real-World Problem It Solves

Turbine systems waste cabinet space with separate input and output modules. Unisolated I/O creates ground loops and EMI-induced false trips.Where you’ll typically find it:

  • Gas turbine starter valve and fuel stop relay control
  • Steam turbine ETS trip circuit monitoring and actuation
  • Compressor anti-surge valve position feedback and command loops

Bottom line: cuts rack footprint and eliminates cross-talk in mixed DI/DO turbine loops.

 

Hardware Architecture & Under-the-Hood Logic

uses a dedicated 32-bit RISC processor with independent input/output isolation. It handles I/O scanning locally to reduce controller load.

  1. Field inputs/outputs terminate at the DC-37 connector.
  2. Inputs pass 1500V optical isolation; outputs drive electro-mechanical relays.
  3. On-board filtering cleans input signals; relay drivers include flyback protection.
  4. Local processor scans states, validates signals, and logs per-channel diagnostics.
  5. Data transmits over dual redundant Ethernet to the Mark VIe controller.
  6. Front-panel LEDs show power, fault, Ethernet link, and I/O status.

 

Field Service Pitfalls: What Rookies Get Wrong

Under-Voltage Relay ChatterTechnicians set supply to 24.0 VDC and report output relay buzzing. Minimum reliable voltage is 27.4 VDC under full load.

  • Field Rule: Set supply to 28.0 VDC. Verify at module terminals with all outputs energized.

Mixed Shield GroundingRookies ground input shields at the module and output shields at the marshalling panel. Creates ground loops that corrupt input readings.

  • Quick Fix: Terminate all cable shields only at the marshalling cabinet; float module ends.

Hot-Swap Backplane FaultsSwapping under power causes transient voltage spikes. Locks the I/O node and requires a hard reset.

  • Field Rule: De-energize the I/O rack or disable node via Toolbox. Wait 60 seconds before removal.
IS220PDIOH1B

IS220PDIOH1B

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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