Basic Information

• Brand: GE

• Series: Mark VIe (Speedtronic / Distributed I/O Pack)

• Model: IS220PDIAH1A

• Product Type: Discrete Contact Input Terminal Board / I/O Pack – Discrete Input Module

Technical Specifications

Product Description

The GE IS220PDIAH1A is a high‑performance discrete input module designed for use in the Mark VIe distributed I/O architecture frequently applied in turbine control, power generation and industrial process systems. This I/O pack serves as the interface between field discrete‑contact input devices (such as limit switches, safety interlocks, relay contacts, position sensors) and the control rack / network via dual Ethernet. With 24 discrete input channels, robust optical isolation, hardware input filtering and dual Ethernet connectivity, the module offers reliable signal acquisition in harsh industrial environments.

This device integrates a processor board common to the Mark VIe I/O packs, along with a discrete‑input acquisition board dedicated to capturing and conditioning input signals. It plugs directly into compatible discrete input terminal boards (e.g., TBCIH1, TBCIH2, TBCIH3, TICI, STCI series) and supports simplex, dual or triple‑modular‑redundant configurations. The dual Ethernet ports provide network redundancy or separation of traffic, enhancing fault tolerance and communication reliability.

Within systems such as gas/steam turbine controls, the IS220PDIAH1A captures discrete status signals such as valve limit positions, breaker or shutdown switch positions, emergency stop contacts, and other feedback elements. It thereby becomes a vital element in the monitoring, sequencing and protection logic of rotating equipment or critical process units. Its rugged design, wide temperature/humidity range and industrial certification make it suited for demanding applications in power plants, oil & gas facilities, and heavy industry.

Applications

This module is applicable in the following scenarios:

• Discrete input acquisition for turbine control systems (gas turbines, steam turbines) where multiple switch status or limit contacts must be monitored.

• Distributed I/O architecture in power generation plants, especially when discrete signal count is high and network communication must be robust.

• Industrial process automation where discrete contact signals (e.g., pump status, motor start/stop, interlock signals) must be fed into a distributed control network.

• Systems requiring redundant network connectivity via dual Ethernet ports, enabling higher availability and separation of control and monitoring traffic.

• Retrofit or spare part use in legacy Mark VIe control racks where the discrete input I/O packs have reached end‑of‑life and must be replaced without major redesign.

Advantages

The IS220PDIAH1A offers several significant benefits:

1. High channel count – With 24 discrete input channels, the module can monitor numerous contact signals, reducing the number of modules required.

2. Robust isolation – Optical isolation up to 1500 V across all inputs ensures signal integrity even under high noise or ground potential differences.

3. Dual Ethernet connectivity – Enables redundant or segregated communications, improving system resilience and availability.

4. Harsh‑environment readiness – With operating range of ‑40 °C to +70 °C (and higher in storage), high humidity tolerance, and IP20 protection, it is built for demanding industrial sites.

5. Modular retrofit capability – Compatible with Mark VIe I/O racks, the module allows simpler replacement or expansion of existing systems.

6. Diagnostic support – The module supports LED status indicators and diagnostic features, simplifying maintenance and fault‑finding.

7. Scalable reliability architecture – Supports simplex, dual and TMR configurations, making it suitable for both standard and highly redundant installations.

8. Reduced system complexity – By consolidating many discrete inputs in one module and integrating networking, system design is simplified and cabinet space is saved.

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