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NFDV561-P51

The Yokogawa NFDV561-P51 is a 32-channel Digital Input (DI) Module designed for the ProSafe-RS Safety Instrumented System (SIS). Its primary function is to read 24 V DC dry contact or sourcing (NAMUR) signals from field devices such as emergency stop buttons, pressure switches, level switches, limit switches, and solenoid valves.

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Technical Specifications

Parameter Specification
Model NFDV561-P51
Compatible System ProSafe-RS Safety Instrumented System
Input Type Dry Contact: OFF: Open circuit, ON: Closed circuit
Voltage (NAMUR): OFF: ≤2 mA, ON: ≥6 mA (typically 8.5V supplied, NAMUR NE44 compliant)
Number of Channels 32
Input Impedance Approx. 4.7 kΩ (for voltage input)
ON Voltage / Current Dry Contact: Close to 0 V
Voltage Input: ≥6 mA (Typ. 8.5V supplied)
OFF Voltage / Current Dry Contact: Open circuit
Voltage Input: ≤2 mA
Response Time OFF to ON / ON to OFF: 10 ms max.
Supply Voltage for Field Approx. 8.5 V DC (for NAMUR sensors, short-circuit protected)
Common Mode Voltage 500 V AC (50/60 Hz) for 1 minute
Isolation Channel-to-Channel: Non-isolated (in groups)
Channel-to-System: Optically isolated
Internal Power Consumption 1.2 W (Typical)
LED Indicators RUN/ERR (Run/Error), MODE, ALM, CH STATUS (per channel, shows ON/OFF state)
Key Diagnostics For Voltage Input: Wire break/short circuit, sensor failure (burnout)
General: Module self-diagnosis, watchdog timer, communication error
Hot Swapping Supported
Operating Temperature -20 to 70 °C
Mounting FCS (Field Control Station)
Safety Certification SIL 2 / SIL 3 (IEC 61508)
Hazardous Area Certifications FM, CSA, ATEX, IECEx, NEPSI