IS220PDOAH1A
IS220PDOAH1A
IS220PDOAH1A
IS220PDOAH1A
IS220PDOAH1A

GE IS220PDIAH1A | 24-Ch Discrete Input Pack for Mark VIe – Field Notes

  • Model: IS220PDIAH1A
  • Alt. P/N: 336A4940CSP1 (control board P/N)
  • Product Series: GE Speedtronic Mark VIe
  • Hardware Type: Packaged Discrete Input (PDIA) I/O Module
  • Key Feature: 24 optically isolated input channels, 4ms hardware filtering
  • Primary Field Use: Reads dry contacts and 24V DC sensors in turbine safety/control loops
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Part number: GE IS220PDIAH1A
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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/24V DC compatible
  • Input Voltage: 18–32 VDC (nominal 24 VDC)
  • Isolation Rating: 1500 VAC optical (input-to-backplane/channel-to-channel)
  • Input Filter: Fixed 4 ms hardware debounce
  • Power Draw: 2.5 W typical; 28.0 VDC nominal input
  • Operating Temperature: -30°C to +65°C
  • Storage Temperature: -40°C to +85°C
  • Dimensions: 12.4 × 7.4 × 17.3 cm (H × W × D)
  • Weight: 0.5 kg
  • Hazardous Rating: Class I Div 2, Zone 2, ATEX / IECEx approved
IS220PDOAH1A

IS220PDOAH1A

The Real-World Problem It Solves

Turbine and generator systems suffer from noisy contact signals and ground loops that cause false trips and intermittent faults. Unfiltered inputs lead to unstable logic and unplanned downtime.

Where you’ll typically find it:

  • Gas turbine starter/ignition permissive contacts
  • Steam turbine emergency trip (ETS) limit switches
  • Generator breaker and auxiliary system status inputs

Bottom line: eliminates cross-talk and stabilizes discrete signals in high-EMI environments.

 

Hardware Architecture & Under-the-Hood Logic

uses a dedicated local microprocessor and isolated opto-couplers. It scans inputs independently, reducing controller load. No backplane power runs through field circuits.

  1. Field contacts/voltages terminate at the DC-37 connector.
  2. Signals pass through 1500V optical isolation barriers.
  3. On-board hardware filter removes transient noise (4ms fixed).
  4. Microprocessor reads channel states and applies diagnostics.
  5. Data buffers and transmits over dual Ethernet to the Mark VIe controller.
  6. Channel status, fault, and power conditions drive front-panel LEDs.
  7. Open-circuit detection flags bad wiring or disconnected sensors.

 

Field Service Pitfalls: What Rookies Get Wrong

Under-Voltage OperationTechs feed 24.0 VDC and see intermittent dropouts. Minimum reliable input is 27.4 VDC under load.

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

Shield Ground LoopsRookies ground field cable shields at both ends. Induced currents create false input triggers.

  • Quick Fix: Terminate shield only at the marshalling cabinet; leave module end floating.

Mechanical Connector StressOver-tightening mounting studs bends the backplane connector. Leads to intermittent communication faults.

  • Field Rule: Hand-tighten studs only. Use a washer to distribute force; avoid side loading.
IS220PDOAH1A

IS220PDOAH1A

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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