Pepperl+Fuchs KFD2-SCD-EX1.LK Analog Output Module | Safe Driver

Global PLC Spare HUB Insight

The KFD2-SCD-EX1.LK by Pepperl+Fuchs is a high-precision analog output driver designed specifically for HART-enabled field devices in hazardous environments. Unlike standard current loops, this SMART Current Driver maintains bi-directional communication, allowing for seamless configuration and diagnostic monitoring of valve positioners or I/P converters. We recommend the KFD2-SCD-EX1.LK for process control loops where field-device health monitoring is essential for predictive maintenance. Its low power dissipation and robust galvanic isolation make it an ideal choice for high-density safety instrumented system (SIS) cabinet designs.

Technical Performance Parameters

• Manufacturer: Pepperl+Fuchs
• Model: KFD2-SCD-EX1.LK
• Category: SMART Current Driver / Analog Output Isolated Barrier
• Input Signal: 4 ... 20 mA (HART compliant)
• Output Signal: 4 ... 20 mA field-side current
• Output Load Capacity: 100 Ω to 700 Ω
• Voltage Drop: ~4 V (or 200 Ω internal resistance at 20 mA)
• Supply Voltage: 20 V to 35 V DC (Power Rail compatible)
• Safety Rating: Intrinsically safe output
• Protection Class: IP20
• Physical Footprint: 20 mm x 115 mm x 115 mm (Housing B1)
• Mounting: 35 mm DIN Rail (EN 60715)

Diagnostic Capability & Application Utility

• HART Transparency: The module supports full digital signal pass-through, allowing control systems to read device diagnostics directly from the field instrument.
• Precise Signal Driving: Engineered to maintain signal integrity over long cable runs, ensuring the loop current stays within strict tolerances regardless of field-side impedance changes.
• System Versatility: Suitable for driving I/P (current-to-pressure) converters, smart valve positioners, and remote proportional displays in petrochemical, oil/gas, and water treatment sectors.
• Fault Management: Provides stable output characteristics that minimize control loop jitter, even under varying ambient thermal conditions.

Shipping & Quality Commitment

• Global Distribution: Efficient logistics via FedEx, UPS, or DHL.
• Rapid Fulfillment: Orders are processed and dispatched within 24 to 48 hours.
• Standard Warranty: 12-month comprehensive performance guarantee included.
• Package Contents: 1x KFD2-SCD-EX1.LK driver unit and standard technical documentation.

Professional FAQ

Question: Does the KFD2-SCD-EX1.LK support non-HART analog output devices?

Answer: Yes, while optimized for HART communication, the unit functions perfectly as a standard isolated 4-20 mA driver for non-smart analog instrumentation.

Question: What should I consider when selecting a load resistance for this driver?

Answer: Ensure the total loop resistance (including cable and field device) stays between 100 Ω and 700 Ω; exceeding 700 Ω will cause the output to saturate and fail to reach the full 20 mA command.

Question: Can I daisy-chain the power supply for multiple modules?

Answer: Yes, utilizing the Power Rail system is highly recommended for multi-module installations, as it eliminates individual power wiring and reduces potential point-of-failure connections.

Question: Is there a way to verify the input-to-output accuracy without a PLC?

Answer: You can verify performance by injecting a precise 4-20 mA current into the input terminals and measuring the output with a calibrated multimeter, ensuring the voltage drop remains consistent with the technical specs.

Question: Why does the unit have an input resistance specification of >100 kΩ?

Answer: This high input impedance ensures that the upstream PLC analog output card is not overloaded, allowing one PLC channel to potentially drive multiple barriers if the loop power budget allows.

Procurement Advisory

• Compatibility Check: Before installation, verify the HART communication version of your field device to ensure optimal performance with the driver's pass-through logic.
• Environment Setup: Due to the IP20 rating, ensure the KFD2-SCD-EX1.LK is installed in a clean, dry, and climate-controlled cabinet environment to maintain the 12-month warranty life-cycle.
• Configuration Note: If you experience signal drop-out, re-check the field-side wiring resistance; if it falls below 50 Ω, the internal resistance monitoring may trigger an alert.

Tags