Product Overview

The Yokogawa NFDV161-P51 is a 64-channel digital input module. This module accepts 24V DC input signals. All channels are isolated for noise protection. The module has two MIL connector sets with 50 pins each. It supports status input and push button edge counting functions. Common wiring is per 16 channels (plus or minus common).

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Part Number Breakdown (Tree Structure)

• NFDV161 → Model Series
  • Digital Input Module
  • 64-channel configuration
  • 24V DC input voltage
  • Isolated channels
• P → Suffix Code 1
  • Standard specification
• 51 → Suffix Code 2
  • Specific configuration variant

Key Specifications

• Brand: Yokogawa
• Part Number: Yokogawa NFDV161-P51
• Product Type: Digital Input Module
• Number of Channels: 64 channels
• Input Voltage: 24V DC
• Isolation: Yes, per channel
• Weight: 0.3 kg

Input Response and Timing

• Input Response Time (Status): 8 ms or less
• Minimum ON Detection Time (Push Button): 20 ms
• Maximum ON/OFF Cycle (Push Button): 25 Hz

Connector Specifications

• MIL Connector Sets: 2 sets
• Pins per Set: 50 pins
• Common Wiring: Per 16 channels
• Common Type: Plus or minus common (selectable)

Functions

• Status Input: Standard digital input monitoring
• Push Button Edge Count: Counts ON/OFF transitions
• Up to 25 Hz counting frequency
• 20 ms minimum ON detection

Power Consumption

• Maximum Current (5V DC): 550 mA

Installation Guide

• Turn off all power before installation.
• Mount the module in the designated slot.
• Connect field devices using MIL connectors (50 pins each).
• Wire common per 16 channels (choose plus or minus common).
• For status input, signal response time is 8 ms maximum.
• For push button input, ensure ON time is at least 20 ms.
• Do not exceed 25 Hz switching frequency for counting.
• Apply power and verify input status LEDs.

Maintenance Tips

• Check MIL connector pins for damage or bending.
• Verify input voltage stays at 24V DC nominal.
• Test each channel periodically with a known signal.
• Keep module dry and free from dust.
• Replace module if response time exceeds 8 ms.

Application Scenarios

• Digital signal monitoring in DCS systems
• Push button panel interface for operator control
• Limit switch and proximity sensor input
• Relay contact status monitoring
• High-density digital input applications (64 channels)
• Industrial automation with Yokogawa systems

Diagnostic Capabilities

• Monitor input status per channel via LEDs.
• Check push button edge count accuracy.
• Verify response time within 8 ms specification.
• Test common wiring for plus or minus configuration.
• Use status input for real-time device monitoring.

Compatibility Notes

• Works with Yokogawa DCS and PLC systems.
• Use with 24V DC dry contacts or NPN/PNP sensors.
• MIL connectors require compatible cables (50-pin type).
• Common wiring per 16 channels reduces wiring complexity.

Package Contents

• One Yokogawa NFDV161-P51 digital input module
• Two MIL connectors (50-pin each, attached)
• One product label

Warranty and Shipping

• 12 months factory warranty from shipment date.
• Warranty covers manufacturing defects only.
• Overvoltage or wrong wiring voids the warranty.
• Shipping options: FedEx, UPS, DHL.
• Tracking number provided after shipment.

Frequently Asked Questions (FAQ)

Q1: How many channels does the NFDV161-P51 have?

The Yokogawa NFDV161-P51 has 64 digital input channels. All channels accept 24V DC signals. Each channel is isolated for noise immunity.

Q2: What is the input response time for status inputs?

Status input response time is 8 ms or less. This provides fast detection of field device changes. For push button inputs, minimum ON detection is 20 ms.

Q3: What connectors does this module use?

The module uses two MIL connectors with 50 pins each. These connectors provide high-density wiring. Use compatible MIL cables for system connection.

Q4: What is the maximum switching frequency for push button counting?

The maximum ON/OFF cycle is 25 Hz for push button input. Minimum ON detection time is 20 ms. This supports standard push button and switch counting applications.

Q5: How is the common wiring configured?

Common wiring is per 16 channels. You can choose plus common or minus common. This flexibility matches different field device wiring requirements.

Buying Guide

When you buy a Yokogawa NFDV161-P51 digital input module, follow these tips. First, count your digital input needs. This module gives 64 channels. Second, check your input voltage. This module uses 24V DC only. Third, verify your response time requirement. Status input is 8 ms, push button is slower. Fourth, consider your connector type. This module uses MIL 50-pin connectors. Fifth, plan your common wiring. Choose plus or minus common per 16 channels. Sixth, calculate your power budget. The module draws 550 mA at 5V DC. Seventh, decide if you need edge counting. Push button function supports up to 25 Hz. Eighth, review warranty terms. We offer 12 months coverage. Ninth, choose your shipping method. We use FedEx, UPS, and DHL. Finally, test a few channels before wiring all 64 field devices.

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