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Product Introduction
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
| Specification | Details |
|---|---|
| Model | NFAP135-S50 |
| Module Type | Pulse Input Module |
| Number of Channels | 16 isolated input channels |
| Input Signal Type | Pulse input (dry contact, open collector, TTL, and voltage type up to 24V DC) |
| Input Frequency Range | 0.1 Hz to 10 kHz |
| Input Voltage Range | 0 to 24V DC |
| Pulse Width | Minimum 100 µs |
| Input Impedance | Approx. 5.1 kΩ |
| Isolation | Channel-to-channel and channel-to-ground isolation |
| Internal Diagnostics | Open/short detection, line integrity monitoring |
| System Compatibility | ProSafe-RS, CENTUM VP |
| Certifications | SIL3 (IEC 61508), CE, FM, CSA, ATEX, RoHS |
| Power Supply | From system baseplate (24V DC nominal) |
| Power Consumption | Approx. 4.8 W |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5–95% RH (non-condensing) |
| Mounting | DIN rail or panel mounting via system baseplate |
| Dimensions (W × H × D) | 32.8 × 107.5 × 130 mm |
| Weight | 0.3 kg |
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.
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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.
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Water & Wastewater Treatment: Interface with flow sensors and turbine meters for tracking water usage and pump operations.
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Food & Beverage: Pulse signals from bottle counters, conveyor speed sensors, and production line metrics.
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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)
-
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. -
How many pulse inputs does the module support?
It supports 16 isolated input channels. -
What is the maximum pulse frequency supported?
The module can capture pulses up to 10,000 Hz (10 kHz). -
What type of pulse inputs can it accept?
It supports dry contact, open collector, TTL, and voltage input signals up to 24V DC. -
Is the module SIL3 certified?
Yes, it meets SIL3 safety standards under IEC 61508. -
Can the module detect signal wiring issues?
Yes, it includes built-in diagnostics for open and short circuit detection. -
Is each input channel isolated?
Yes, all 16 channels are isolated from each other and from the ground. -
Which control platforms is this compatible with?
It is fully compatible with Yokogawa’s ProSafe-RS and CENTUM VP systems. -
What is the installation method for this module?
It can be DIN rail mounted or panel mounted using a system baseplate. -
Does it require an external power supply?
No, it draws power from the system baseplate (24V DC typical).
Recommended Related or Series Models
| Model | Description |
|---|---|
| NFAP135-S00 | Base version of NFAP135 without advanced diagnostics. |
| NFAR141-S50 | Redundant input module for high-integrity applications. |
| NFAI143-S50 | Analog input module with 16 isolated channels and HART support. |
| NFAI841-S50 | Analog I/O module with 8 AI and 4 AO channels, SIL3 certified. |
| NFAO141-S50 | Analog output module for precise signal transmission. |
| NFAD141-S50 | Digital input module with high-speed response and SIL3 compliance. |
Popular Yokogawa Models (Same Brand)
| Model | Description |
|---|---|
| STARDOM FCN-RTU | Compact remote terminal unit for edge control and data logging. |
| CENTUM VP | Flagship DCS platform supporting large-scale automation and plant integration. |
| ProSafe-RS | Integrated Safety Instrumented System (SIS) platform certified to SIL3. |
| YS1500 | High-stability single-loop controller used in precision applications. |
| AXG Magnetic Flowmeter | Smart flowmeter offering HART and diagnostics for conductive fluids. |
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