GE IS230TNDSH2A | Mark VIe Discrete I/O Terminal Board – Field Service Notes
GE IS230TNDSH2A | Mark VIe Discrete I/O Terminal Board – Field Service Notes - Image 2
GE IS230TNDSH2A | Mark VIe Discrete I/O Terminal Board – Field Service Notes - Image 3
GE IS230TNDSH2A | Mark VIe Discrete I/O Terminal Board – Field Service Notes - Image 4

GE IS230TNDSH2A | Mark VIe Discrete I/O Terminal Board – Field Service Notes

  • Model: IS230TNDSH2A
  • Alt. P/N: IS200TDBSH2ACC (legacy cross-reference)
  • Series: GE Speedtronic Mark VIe / VIeS
  • Type: PDIO Discrete I/O Terminal Board (Simplex)
  • Pair With: IS220PDIOH1A / IS220PDIOH1B digital I/O pack
  • Key Feature: 24× isolated discrete inputs, 12× Form-C relay outputs, DIN-rail mount
  • Use: Field wiring interface for turbine digital I/O (valves, limit switches, alarms)
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Description

Hard-Numbers: Technical Specifications

  • Input Channels: 24× discrete contact inputs (18–32 VDC wetting)
  • Output Channels: 12× Form-C relay outputs (5A @ 250VAC / 30VDC)
  • Isolation: 2500VAC field-to-backplane; channel-to-channel isolated
  • Power Input: 24 VDC (18.5–32 VDC), 10 W max
  • Relay Life: ≥10M mechanical, ≥100K electrical (full load)
  • Response Time: Input ≤10ms, Output ≤5ms
  • Temp: -40°C to +70°C; Humidity 5–95% (non-condensing)
  • Dimensions: 233 × 150 × 64 mm; Weight: 1.5 kg
  • Mount: 35mm DIN-rail
  • Cert: UL, CE, Class I Div 2, ATEX Zone 2
  • Protection: Over-voltage, surge suppression, reverse polarity

The Real-World Problem It Solves

Turbine systems have hundreds of digital field signals (limit switches, solenoids, alarms). Uncontrolled wiring causes ground loops, EMI noise, and intermittent I/O faults. provides isolated, surge-protected termination with relay outputs to drive field loads safely.

Typical Applications:

  • Gas/steam turbine valve position feedback
  • Emergency stop (E-stop) and safety interlock circuits
  • Pump starter and motor control signals
  • Alarm annunciation and discrete status monitoring

Bottom line: stabilizes digital I/O and prevents noise-induced trips.

 

Hardware Architecture & Under-the-Hood Logic

is a passive-active interface with no microprocessor. It conditions and routes discrete signals:

  1. Field devices wire to pluggable euro-style terminals.
  2. Inputs: 24× isolated channels with surge/EMI filtering.
  3. Outputs: 12× Form-C relays driven by PDIO module signals.
  4. Galvanic isolation separates field grounds from control system.
  5. Status LEDs indicate input on/off, relay energized, power OK.
  6. Direct backplane connection to IS220PDIOH1B I/O pack.
  7. Over-voltage clamping protects against inductive load spikes.

 

Field Service Pitfalls: What Rookies Get Wrong

Under-sized Relay WiringUsing 22 AWG for 5A relay loads causes voltage drop and overheating.

  • Field Rule: Use 18 AWG stranded for relay outputs; max 3m length.

Missing Surge Suppression on Inductive LoadsSolenoids/valves generate voltage spikes that destroy relay contacts.

  • Quick Fix: Install flyback diodes (1N4007) or RC snubbers on all DC outputs.

Daisy-Chaining Input Wetting VoltageSingle power feed to all inputs creates common-mode failure risk.

  • Field Rule: Split inputs into 2–3 groups; use separate 24 VDC sources.

Poor Grounding PracticesMixing field and cabinet grounds causes 5–20% signal error.

  • Field Rule: Terminate shields ; float remote ends.

Commercial Availability & Pricing 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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