The Yokogawa NFAP135-S50 Pulse Input Module is an advanced signal acquisition module specifically designed for collecting high-speed pulse data from field instruments. As part of the ProSafe-RS series, this module is engineered for SIL3 safety applications as defined by IEC 61508, making it ideal for high-integrity industrial systems that demand dependable and accurate signal collection.

This module supports 16 isolated input channels designed to accept pulse-type signals such as frequency, contact closure, and voltage pulses from a wide range of transmitters including flow meters, turbine meters, and encoders. It is optimized for use within Field Control Stations (FCS) and supports real-time monitoring, diagnostics, and system integration in distributed control and safety environments.

With high noise immunity, built-in diagnostics, and precise timing capabilities, the NFAP135-S50 ensures that even in demanding process environments, pulse signals are accurately captured, time-stamped, and transmitted for further control or logging operations.

Product Specifications

Product Applications

The NFAP135-S50 Pulse Input Module serves critical roles in safety and process control systems where high-speed pulse data is essential:

• Oil & Gas: Pulse input for flow metering in pipeline monitoring, custody transfer, and offshore production.

• Chemical Processing: Frequency-based feedback from dosing and metering systems to ensure precision chemical addition.

• Power Generation: Integration with turbine speed sensors and pulse-type encoders for equipment protection and synchronization.

• Water & Wastewater Treatment: Interface with flow sensors and turbine meters for tracking water usage and pump operations.

• Food & Beverage: Pulse signals from bottle counters, conveyor speed sensors, and production line metrics.

• Metallurgy and Mining: Used in ore flow rate calculations, conveyor belt monitoring, and feeder speed tracking.

Product Advantages

• High-Speed Pulse Capture

  Supports up to 10 kHz input frequency, suitable for turbine meters and fast counters.

• SIL3-Certified Safety Compliance

  Fully certified under IEC 61508 standards for use in safety-critical environments.

• Comprehensive Input Compatibility

  Accepts dry contact, TTL, and voltage-type pulse inputs, providing broad field device compatibility.

• 16 Isolated Channels

  Each channel is isolated to reduce noise and interference, enhancing overall reliability.

• Built-in Diagnostics

  Continuous loop integrity monitoring and diagnostics for open, short, and fault conditions.

• Compact and Modular

  The slim 35 mm-wide design optimizes panel space while maintaining high channel density.

• Wide Operating Range

  Built to perform under harsh temperature and humidity conditions without degradation.

• Simple Integration

  Seamlessly integrates into ProSafe-RS and CENTUM VP environments for unified control.

Frequently Asked Questions (FAQ)

1. What is the primary function of the NFAP135-S50 module?

   It is designed to receive and process pulse signals from field devices such as flow meters and encoders.

2. How many pulse inputs does the module support?

   It supports 16 isolated input channels.

3. What is the maximum pulse frequency supported?

   The module can capture pulses up to 10,000 Hz (10 kHz).

4. What type of pulse inputs can it accept?

   It supports dry contact, open collector, TTL, and voltage input signals up to 24V DC.

5. Is the module SIL3 certified?

   Yes, it meets SIL3 safety standards under IEC 61508.

6. Can the module detect signal wiring issues?

   Yes, it includes built-in diagnostics for open and short circuit detection.

7. Is each input channel isolated?

   Yes, all 16 channels are isolated from each other and from the ground.

8. Which control platforms is this compatible with?

   It is fully compatible with Yokogawa’s ProSafe-RS and CENTUM VP systems.

9. What is the installation method for this module?

   It can be DIN rail mounted or panel mounted using a system baseplate.

10. Does it require an external power supply?

    No, it draws power from the system baseplate (24V DC typical).