GE IS220PDIAH1A – Isolated Discrete Input Terminal Board
- Series: Mark VIe (Part of GE’s Speedtronic family for turbine & industrial control, specifically within the PACSystems RX3i platform).
- Function: Provides high-density, isolated discrete (on/off) DC voltage inputs to the Mark VIe controller.
- Primary Role: Interfaces field devices (switches, sensors, relays) providing DC status signals to the Mark VIe Safety controller for monitoring and protection logic.
- Key Features:
- High Channel Density: 32 isolated input channels in a single-slot module.
- Electrical Isolation: Channels are optically isolated from each other and from the controller’s internal logic/bus (>1500V AC RMS typical). Critical for noise immunity and safety.
- Wide Voltage Range: Supports a broad range of DC input voltages.
- Dry Contact / Sourcing Input: Can interface with dry contact devices (switches, relays) or DC sourcing devices (proximity switches, encoders).
- Built-in Diagnostics: Monitors input status, channel health, and module functionality. Reports faults to the controller.
- LED Status Indicators: Per-channel LEDs (typically green) show input state (On/Off) and module health LEDs (Power OK, Fault).
- Redundant Power Input: Supports connection to two separate +24VDC power sources for increased availability.
- High-Speed Operation: Suitable for typical protection and sequence logic scanning speeds.
- Hot Swappable: Designed for replacement without powering down the entire system (requires proper procedures).
- Certified Safety: Designed for use in Safety Instrumented Systems (SIL 2 capable as part of a qualified system).
- Purpose: To reliably acquire the on/off status of critical field devices (e.g., pressure switches, limit switches, valve position indicators, trip signals, pushbuttons) and transmit this status digitally to the Mark VIe controller for processing within control, protection, and sequencing logic.
- Applications & Use Cases:
- Turbine Protection Systems (Gas & Steam).
- Critical Machine Sequencing & Interlocking.
- Plant Annunciator Systems (Alarm Initiation).
- Safety Shutdown System Inputs.
- Monitoring relay contacts and discrete sensors.
- General industrial process control where high-density, isolated DC inputs are required for reliability and safety.
- Application Fields:
- Power Generation (Gas Turbines, Steam Turbines, Combined Cycle Plants).
- Oil & Gas (Compressor Control, Pump Monitoring, Safety Shutdowns).
- Industrial Processing (Chemical, Petrochemical, Pharmaceutical).
- Water/Wastewater Treatment.
- Marine Propulsion Control.
GE IS220PDIAH1A Product Parameters & Specifications
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Parameter Category
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Parameter
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Specification / Value
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Notes
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|---|---|---|---|
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General
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GE Part Number
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IS220PDIAH1A
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Function
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Isolated Discrete Input Terminal Board
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32 Channels
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Controller Platform
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Mark VIe (PACSystems RX3i)
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Requires compatible controller (e.g., IC695xxx) and backplane
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Series
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Mark VIe I/O Pack (200-Series)
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Electrical – Inputs
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Number of Channels
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32
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Input Type
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Isolated Sink / Dry Contact
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Accepts sourcing field device outputs or dry contacts
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Input Voltage Range
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48 V DC to 125 V DC
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Standard Operating Range
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High Logic Level
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≥ 43 V DC
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Minimum voltage recognized as logic “1” (ON)
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Low Logic Level
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≤ 14 V DC
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Maximum voltage recognized as logic “0” (OFF)
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Input Impedance
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~ 7.8 kΩ
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Typical value
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Input Current (ON)
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~ 6 mA @ 48V DC, ~ 16 mA @ 125V DC
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Typical current draw when input is ON
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Isolation
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Channel-to-Channel: >1500V AC RMS
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Channel-to-Bus/Logic: >1500V AC RMS
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Maximum Field Wire Size
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16 AWG (1.31 mm²)
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Electrical – Power
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Supply Voltage
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+24 V DC Nominal
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Referenced to RTN (Return)
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Supply Voltage Range
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+19.2 V DC to +30 V DC
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Operating range
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Maximum Power Consumption
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~ 5 Watts
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Depends on active inputs & configuration
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Power Connections
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2 Independent Terminals (Redundant)
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Provides power supply redundancy
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Mechanical/Physical
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Form Factor
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Single-Slot Module
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Fits Mark VIe / RX3i rack
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Connector Type
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Removable Terminal Block (supplied)
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Spring-clamp or screw-clamp types exist (specify when ordering)
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Operating Temp Range
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-40°C to +70°C (-40°F to +158°F)
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Storage Temp Range
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-40°C to +85°C (-40°F to +185°F)
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Humidity
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5% to 95% non-condensing
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Compliance & Certifications
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Safety
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SIL 2 (as part of qualified system)
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IEC 61508 / IEC 61511
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EMC
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CE Marked, FCC Part 15 Class A
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Compliant with relevant industrial standards
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Hazardous Locations
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Typically intended for General Purpose
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Specific hazardous location ratings depend on overall system install.
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Diagnostics & Indicators
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Per-Channel Status
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Green LED per channel (Input On/Off)
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Module Status LEDs
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Power OK (Green), Module Fault (Red)
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Diagnostics Reported
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Open Wire, Short Circuit, Module Fault
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Reported to controller via backplane
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Important Notes:
- System Component: The IS220PDIAH1A is not a standalone device. It functions only when installed in a compatible Mark VIe / RX3i rack connected to a controller (e.g., IC695CPUxxx).
- Configuration: Requires configuration within the Mark VIe ToolboxST engineering software.
- Field Wiring: Strict adherence to GE’s installation guidelines for field wiring, grounding, and separation is critical for noise immunity, safety, and proper operation.
- Safety: While SIL 2 capable, achieving a specific SIL level requires a fully qualified system design and validation per IEC 61508/61511 standards.
- Variants: Configuration details (e.g., terminal block type – spring clamp vs. screw) might exist under the same base part number. Always verify the exact specification for your order.
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