2. Features

• 16 Isolated Channels: Module‑level isolation between field and internal circuits.

• Dry‑Contact Input: Compatible with no‑voltage contact signals.

• Dual‑Redundancy: Hot‑standby pairing with seamless switchover.

• Fast Response: ≤40 ms maximum input response time.

• High Isolation: 2 kV AC dielectric withstand (1 min) between input and system.

• LED Indicators: PWR, RUN, and CH1–CH16 status LEDs.

• Industrial Reliability: Withstands EMI and transient overvoltage.

3. Specifications

• Model: SDV144‑S33

• Type: Digital Input (DI)

• Channels: 16 (module‑isolated)

• Input Signal: Dry contact (no‑voltage)

  • ON: ≤1 kΩ

  • OFF: ≥100 kΩ

• Input Current: 6 mA ±20% (24 V DC, 0 Ω contact)

• External Power: 24 V DC (+20%/−10%), 200 mA

• Max Input Voltage: 30 V DC (instantaneous)

• Response Time: ≤40 ms

• Isolation: 2 kV AC (1 min) between input and system

• Power Consumption:

  • 5 V DC: ≤290 mA

  • 24 V DC: ≤140 mA

• Operating Temperature: 0°C to +55°C

• Storage Temperature: −20°C to +70°C

• Humidity: 5%–95% RH (non‑condensing)

• Dimensions (W×H×D): 32 × 106 × 130 mm

• Weight: Approx. 0.285 kg

• Mounting: Rack‑mount in SNU/FCU cabinet.

4. System Compatibility

• Safety Systems: ProSafe‑RS (SSC50/60, SNB10D)

• DCS Platforms: CENTUM VP, CENTUM CS3000 (R3+)

• Bus Interface: ESB bus (via EC401‑50 coupler)

• Redundancy: Dual‑redundant module pairing supported.

5. Installation & Wiring

• Mounting: Insert into designated SNU/FCU slot; secure with latch.

• Wiring:

  • Connect field dry contacts to the terminal block.

  • Apply 24 V DC external power to module terminals.

  • Ensure proper grounding to minimize EMI.

• Redundant Setup: Install two SDV144‑S33 modules in adjacent slots; system auto‑configures hot‑standby synchronization.

6. LED Indicators

• PWR (Green): ON when 5 V DC backplane power is normal.

• RUN (Green): ON when operational and communicating with the controller.

• CH1–CH16 (Yellow): ON = contact closed (ON); OFF = contact open (OFF).

7. Diagnosis & Fault Handling

• Self‑Diagnostics: Monitors hardware, communication, and input status.

• Fault Detection: Identifies open/short circuits, overvoltage, and communication errors.

• Alarm Reporting: Sends fault codes to HMI/maintenance station.

• Redundancy Switchover: Seamless takeover by standby module if active module fails (no data loss).

8. Applications

• Process Industries: Petrochemical, power generation, oil & gas, water treatment, pharmaceuticals.

• Safety Functions: ESD, fire & gas (F&G) detection, interlock systems.

• Control Applications: Monitoring switch status, valve position, and equipment run/stop status。