IS230STCIH6A
IS230STCIH6A
IS230STCIH6A
IS230STCIH6A
IS230STCIH6A

GE IS400TDBTH2A | Mark VI TMR Discrete I/O Terminal Board – Field Service Notes

  • Model:
  • Series: GE Speedtronic IS400 / Mark VI (also compatible with Mark VIe)
  • Type: TMR Discrete I/O Terminal Board (DISCRETE BD TMR TB)
  • Key Feature: 32-channel digital input + 12-channel relay output, triple-modular redundant (TMR)
  • Interface: Connects field wiring ↔ Mark VI PDIO (Programmable Digital I/O) modules
  • Use Case: Critical digital I/O termination for gas/steam turbine controls
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Part number: IS400TDBTH2A
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Description

Hard-Numbers: Technical Specifications

  • Digital Inputs: 32× TMR 24V DC discrete inputs (R/S/T triplicated)
  • Relay Outputs: 12× Form-C (SPDT) mechanical relays
    • Relay Rating: 2A @ 30V DC / 120V AC
  • Isolation: 2500 VDC channel-to-backplane galvanic isolation
  • Termination: Screw terminal blocks (14–22 AWG)
  • Logic: Passive terminal (no CPU/software); TMR signal routing
  • Backplane: 2× high-density PCB connectors (to PDIO modules)
  • Operating Temp: -30°C to +65°C
  • Power: Passive (draws logic power from PDIO backplane)
  • Dimensions: ~178 × 144 × 40 mm
  • Weight: ~0.6 kg
  • Certifications: UL, CE, Class I Div 2, ATEX, RoHS
IS230STCIH6A

IS230STCIH6A

Real-World Value & Applications

Turbine systems need reliable digital sensing (valve positions, pressure switches, run permissives) and fail-safe relay outputs (trips, shutdowns). Single-point failures risk unplanned outages.

delivers:

  • TMR redundancy: 3 independent input paths prevent single-channel failure
  • Relay safety: 12 Form-C outputs for critical shutdown/control
  • Noise isolation: Protects PDIO modules from field transients and ground loops
  • Industrial ruggedness: For power plants, offshore drilling, oil/gas compressor controls

Typical Installs:

  • Mark VI/VIe turbine control cabinets
  • Digital I/O termination panels
  • Safety shutdown & permissive circuits

 

Hardware Architecture (Under the Hood)

  1. Field Wiring: Sensors/switches → input terminals; loads → relay outputs
  2. TMR Splitting: 32 inputs split into R/S/T trios → 3 independent PDIO modules
  3. Relay Logic: 12 Form-C relays driven by PDIO output channels
  4. Protection: On-board fusing, TVS diodes, EMI filtering
  5. Backplane Connection: Direct interface to Mark VI PDIO I/O packs
  6. Status LEDs: Input power/relay actuation indicators for quick diagnostics
IS230STCIH6A

IS230STCIH6A

Field Service Pitfalls (What Rookies Mess Up)

1. Wrong Input Polarity

  • Issue: 24V DC inputs miswired → no signal or module damage
  • Fix: Label +24V / COM clearly; verify with multimeter pre-power

2. Overloading Relays

  • Issue: Exceeding 2A → relay welding/burnout
  • Rule: Use interposing relays for loads >2A or inductive loads (motors/solenoids)

3. Poor TMR Channel Labeling

  • Issue: Unlabeled R/S/T → miswiring → TMR voting faults
  • Fix: Mark each terminal R/S/T; continuity-test before commissioning

4. Ground Loops

  • Issue: Multiple ground points → noisy inputs / erratic readings
  • Fix: Single-point ground at ; float field grounds

 

Commercial Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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