IS420PDIAH1A | GE Electric 16 channel isolated analog input module
Product Function
The IS420PDIAH1A is a 16-channel isolated analog input module designed for GE’s Mark VIe industrial control systems. It converts field-level DC voltage/current signals (e.g., sensors, transmitters) into digital data for turbine controllers, providing high-accuracy monitoring with galvanic isolation and fault diagnostics.
Product Specifications & Parameters
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Category
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Specification
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Manufacturer
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GE Digital
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Series
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Mark VIe Turbine Control System
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Type
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Analog Input Module
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Form Factor
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VME-9U (compatible with IS200VCCCH1D chassis)
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Channels
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16 single-ended / 8 differential
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Input Types
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±10V DC, 0–10V DC, 0–20mA, 4–20mA (software-selectable per channel)
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Accuracy
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±0.05% FSR @ 25°C
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Resolution
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16-bit ADC
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Sampling Rate
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100 samples/sec (all channels)
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Isolation
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1500V AC channel-to-channel & channel-to-backplane
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Common-Mode Rejection
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>120 dB @ 50/60 Hz
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Power Consumption
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5W @ +5V DC (backplane-powered)
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Operating Temp.
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-40°C to +70°C
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EMC Compliance
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IEC 61326, IEEE 1613
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Certifications
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CE, RoHS, UL Class I Div 2 (hazardous locations)
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Connection Interface
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Removable terminal block (TB1: Ch1–8, TB2: Ch9–16)
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Series Information
Part of GE’s Mark VIe I/O Pack Series – interoperable with:
- Controllers: IS420UCSxH1x
- Chassis: IS200VCCCH1D, IS200VCRCH1B
- Companion Modules:
- IS420ESWBH3A (Discrete I/O)
- IS420ESELH1B (TMR Safety I/O)
- IS420EPDMG3A (Power Supply)
Key Features
- Auto-Ranging: Automatically detects 4–20mA/0–10V/±10V signals.
- Open-Wire Detection: Flags broken sensor loops (4–20mA range).
- Overload Protection: ±35V DC sustained / ±50V DC transient.
- Lead Resistance Compensation: Up to 100Ω for RTDs/thermocouples (with external card).
- Hot-Swap Support: Replaceable without rack power-cycle.
- Real-Time Diagnostics: Per-channel health status via LED indicators.
Role & Purpose
- Signal Conditioning: Digitizes analog inputs with noise filtering.
- Isolation Barrier: Prevents ground loops in harsh electrical environments.
- Data Acquisition: Feeds sensor data (pressure, temp, flow) to Mark VIe controllers.
- Predictive Maintenance: Tracks drift/errors via ToolboxST™ software.
Applications & Use Cases
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Industry
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Application
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Power Generation
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Turbine lube oil temp/pressure, exhaust gas thermocouples
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Oil & Gas
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Pipeline pressure transmitters, compressor vibration sensors
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Chemical Processing
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Reactor level transducers, pH analyzer inputs
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Water Treatment
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Flowmeter signals (0–10V), dissolved oxygen sensors
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HVAC Supervisory
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Chiller/boiler temp monitoring in critical facilities
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Renewable Energy
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Solar inverter DC voltage/current monitoring
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Technical Notes
- Wiring Configuration:
- Voltage Inputs: Ch± to TBx terminals, AGND for shield
- Current Inputs: 250Ω shunt resistor auto-enabled (4–20mA)
- Status Indicators:
- Green LED: Channel active
- Red LED: Fault (open wire, overrange, calibration error)
- Module Health: Dual-color LED (green=OK, amber=warning, red=fail)
- Calibration:
- Automatic zero/span adjustment via ToolboxST™
- Drift <±0.01%/year
- Safety Limits:
- SIL 2 capable (with TMR controller)
- HART protocol support (with IS420ETHCx gateway)
Integration Rules:
- Max. 4 modules per IS200VCCCH1D chassis.
- Field wiring: 18–22 AWG shielded twisted pair.
- Grounding: Single-point chassis ground at TB1/TB2.
Typical Signal Mapping
IS420PDIAH1A Channel Allocation:
Ch1–4 : Gas Turbine Bearing Temps (RTD inputs)
Ch5–8 : Fuel Valve Positions (4–20mA)
Ch9–12 : Exhaust Duct Pressures (±10V)
Ch13–16: Vibration Analyzer Signals (0–10V) 
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