IS220PDOAH1A | GE Electric (TMR) Analog Output Module
Product Description
The GE IS220PDOAH1A is a Triple Modular Redundant (TMR) analog output module from GE’s Mark VIe Speedtronic series, designed for critical process control in turbine systems. It provides three independent 4–20mA output channels with fault-tolerant voting logic to ensure signal integrity for safety-critical actuators like fuel valves, governors, and dampers in power generation environments.
Product Parameters & Specifications
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Category
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Specification
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Model
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Series
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Mark VIe Turbine Control System
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I/O Type
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Triple Modular Redundant (TMR) Analog Output
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Channels
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3 independent channels (1 channel per TMR leg)
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Output Signal
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4–20 mA DC (sourcing)
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Load Capacity
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≤ 750 Ω per channel (24V DC supply)
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Resolution
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16-bit (0.0015% full scale)
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Accuracy
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±0.1% of span @ 25°C
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Update Rate
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10 ms per channel
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Isolation
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1500V AC channel-to-backplane
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Voltage Range
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24V DC (±10%)
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Temperature Range
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-40°C to +70°C (-40°F to +158°F)
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Safety Certification
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SIL2 (IEC 61508)
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Communications
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100 Mbps Ethernet (Via PDM backplane)
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Status
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Discontinued (Legacy product)
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Key Features
- TMR Architecture: Triple-channel redundancy with 2-out-of-3 (2oo3) voting for fault tolerance.
- Hot Swap Support: Replace modules without system shutdown.
- Diagnostic LEDs: Per-channel status indication (OK/Fault/Active).
- Signal Conditioning: Built-in transient protection and noise filtering.
- Synchronization: Optical TripleBus+ sync (<100 ns skew) with other Mark VIe modules.
- Hardware Watchdog: Auto-disables outputs on critical failure.
Function & Purpose
Converts digital control signals from Mark VIe controllers (e.g., IS420UCSCH1A) into robust analog 4–20mA currents to drive field actuators. Performs continuous self-checks and voting to ensure signal validity, enabling failsafe control of:
❶ Fuel flow valves
❷ Inlet guide vanes (IGVs)
❸ Bypass dampers
❹ Lube oil pumps
Applications
- Gas/Steam Turbine Fuel Control Systems
- Compressor Anti-Surge Valve Positioning
- Boiler Feedwater Regulation
- Emissions Control (NOx Dampers/SCR Systems)
Application Fields
- Power Plants (Combined-cycle, Peaking, Base-load)
- Oil & Gas (Pipeline Compression, Offshore Platforms)
- Petrochemical Process Control
- District Energy Systems
- Marine Propulsion Control
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