Pepperl+Fuchs KCD2-SOT-1.LB SIL 2 Certified Isolated Safety Barrier with

The KCD2-SOT-1.LB is a high-performance 1-channel switch amplifier from Pepperl+Fuchs' K-System, specifically engineered to transfer digital signals from field devices to control systems with complete galvanic isolation. This signal conditioner accepts NAMUR sensors (acc. to EN 60947-5-6) or dry contact inputs and provides two passive transistor outputs that can be configured as dual signal outputs or one signal output and one error output.

With a compact 12.5 mm width and 24 V DC power supply (via Power Rail or terminals), the KCD2-SOT-1.LB can be used as a signal splitter (1 input to 2 outputs), making it the ideal solution for applications requiring redundant signal distribution or combined signal and fault monitoring.

Certified for SIL 2 (SC 3) acc. to IEC/EN 61508, the KCD2-SOT-1.LB delivers reliable, safety-rated performance for demanding industrial automation and process control applications.

The ".LB" suffix denotes the version with configurable second output (signal or fault message), distinguishing it from standard models.

• Signal Splitter Functionality: One input drives two passive transistor outputs — use as a signal splitter for redundant control systems or for driving multiple devices from a single field sensor
• Configurable Second Output: The second output can be configured via DIP switch as either a signal output (duplicating the input signal) or a fault message output (indicating line fault conditions) — providing application flexibility
• Dual Input Compatibility: Accepts both NAMUR sensors (acc. to EN 60947-5-6) and dry contact (mechanical switch) inputs — flexible field device connectivity
• Line Fault Detection (LFD): Monitors field wiring for breakage (I ≤ 0.1 mA) and short-circuit (I ≥ 6.5 mA) conditions — provides diagnostic information for predictive maintenance
• Reversible Mode of Operation: DIP-switch configurable for normally open or normally closed operation — adapts to any application requirement
• Galvanic Isolation: Reinforced insulation (300 Veff) between input/output and input/power supply — ensures safe separation of field and control circuits
• SIL 2 Certified: Safety Integrity Level 2 (SC 3) acc. to IEC/EN 61508 — suitable for safety-related applications
• High Switching Frequency: Operates up to 5 kHz — supports high-speed digital signal processing
• Fast Response Time: ≤ 200 µs response — ensures real-time signal transfer
• Power Rail Compatibility: Connects to Pepperl+Fuchs Power Rail for simplified daisy-chained power distribution
• LED Status Indicators: Visual indication of channel status, fault conditions, and power supply — simplifies troubleshooting

The KCD2-SOT-1.LB provides complete galvanic isolation between field circuits and control circuits. The device transfers digital signals from NAMUR sensors (proximity sensors, level switches, flow monitors) or dry contacts (mechanical switches, relays, push buttons) from the field to the control system.

• The input signal controls two passive transistor outputs independently
• Output I always provides the signal output (following the input state)
• Output II can be configured via DIP switch as either:
  • Signal output: Duplicates the input signal (signal splitter mode)
  • Fault message output: Indicates line fault conditions (breakage or short-circuit)
• The mode of operation can be reversed via DIP switches (normally open / normally closed)
• Line fault detection (LFD) monitors field wiring integrity and can be disabled if not required
• Fault conditions are indicated via front-panel LEDs according to NAMUR NE44 and a collective error message output on the Power Rail

The KCD2-SOT-1.LB is specifically designed for digital signal transfer and distribution in demanding industrial environments:

• NAMUR inductive proximity sensors (EN 60947-5-6)
• NAMUR capacitive level switches
• Mechanical dry contacts (push buttons, limit switches, relays)
• Intrinsically safe sensors via Zener barriers

• Signal Splitter Mode: One sensor feeding two PLC input cards (redundant architecture)
• Signal + Fault Mode: One output to control system, second output to alarm panel for fault notification

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