Description
- Product Model: IS220PDIOH1B
- Manufacturer: GE
- System Platform: Mark VIe
- Power Supply Voltage: 28 V DC nominal (minimum 27.4 V DC at input), with transient tolerance to maintain stable operation during turbine power disturbances.
- Power Consumption: Typically under 10 W, supporting efficient thermal performance in multi-pack enclosures.
- Operating Temperature Range: -30 °C to +65 °C, extended industrial grade for turbine hall or outdoor deployment.
- Storage Temperature Range: -40 °C to +85 °C, enabling reliable long-term spare storage.
- Humidity Range: Up to 95% non-condensing, suitable for humid power plant atmospheres.
- Communication Interfaces: Dual RJ-45 10/100 Mbps Ethernet ports, providing redundant IONet connectivity with deterministic timing for TMR fault tolerance.
- Discrete Input Channels: 24 contact inputs, supporting dry contacts with pack-supplied wetting voltage.
- Discrete Output Channels: 12 form-C relay contacts, configurable for normally open/closed operation with load ratings suitable for interlock and command signaling.
- Contact Wetting Voltage: 32 V DC nominal (internally derived), ensuring dependable low-current contact detection without external supplies.
- Input/Output Isolation: Optical isolation on inputs and relay isolation on outputs (typically 1500 V), critical for noise suppression and safety in high-EMI turbine settings.
- Mounting Type: Plugs onto compatible discrete terminal boards (e.g., TBCI or STCI series) via DC-37 connector, with vibration-resistant DIN-rail or panel mounting.
- Environmental Protection: Conformal-coated PCB; certified for Class I, Division 2 hazardous locations (Groups A–D), allowing safe use in explosive atmospheres.
- Certifications and Standards: Compliant with IEC 61000 EMC series, IEC 61131-2, hazardous area approvals, and GE Speedtronic qualification for turbine controls.
- Mean Time Between Failures (MTBF): >200,000 hours typical for Mark VIe I/O packs, supporting continuous high-availability operation.
- Electromagnetic Compatibility (EMC): Meets industrial standards for immunity and emissions, minimizing interference near generators or power electronics.
- Diagnostics: Comprehensive monitoring of input states, output relay health, wetting supply, and Ethernet connectivity, with fault alarms via IONet.
Technical Architecture & Functional Positioning
The IS220PDIOH1B functions as a hybrid discrete I/O pack in the Mark VIe distributed framework, positioned at the field edge to consolidate input sensing and output actuation. It interfaces with terminal boards for field wiring, supplies wetting to inputs, optically isolates signals, scans states, drives relay outputs, and exchanges data over dual IONet Ethernet with the controller. This integrated design reduces separate input/output pack requirements, optimizing cabinet space and wiring in turbine applications.
Core technologies include optical isolators for input protection, form-C relays for versatile output switching, shared Mark VIe processor architecture for uniform diagnostics, and dual Ethernet for TMR voting on both inputs and outputs—ensuring high-integrity discrete logic. The pack’s wetting supply simplifies dry-contact integration, while relay feedback supports output verification.
These features tackle turbine-specific needs: reliable discrete permissives for sequencing and protection, fault-tolerant operation in TMR setups, and modular hot-swap capability to limit downtime. Onboard diagnostics track relay coil status, contact integrity, and network health, enabling predictive alerts that enhance system availability.
Typical Application Scenarios
- Deployed in gas turbine control for integrating discrete permissives, limit switches, and relay commands in startup, shutdown, and overspeed protection sequences.
- Used in steam turbine systems to handle breaker status, valve interlocks, and auxiliary equipment discrete signals for coordinated regulation.
- Serves as a direct replacement in Mark VIe turbine installations, maintaining IONet compatibility and terminal board flexibility.
- Supports combined-cycle plants by managing discrete signals from HRSG interlocks, pumps, or dampers tied to turbine operation.
- Utilized in hazardous-area turbine-driven compressors or mechanical drives, leveraging Div 2 certification for safe mixed discrete I/O.
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