Yokogawa NFLR121-S50 STARDOM RS-422/RS-485 Communication Module

Product Overview

The Yokogawa NFLR121-S50 acts as a high-performance serial communication interface for the STARDOM FCN autonomous controller series. This module provides two independent ports for RS-422 or RS-485 connectivity, enabling seamless integration with third-party PLCs, motor drives, and field instruments. We supply this unit as 100% Brand New and Original, ensuring your control network maintains high-speed data integrity and deterministic communication across industrial serial links.

Part Number Breakdown

The NFLR121 nomenclature follows the Yokogawa modular classification system for STARDOM I/O and communication units:

Technical Specifications

The NFLR121-S50 offers versatile configuration options for complex multipoint networks:

• Port Type: 2 × RS-422/RS-485 Ports

• Communication Modes: Half-duplex or Full-duplex

• Synchronization: Start-stop (Asynchronous)

• Data Transmission: ASCII or Binary formats

• Character Length: 7 or 8 bits

• Parity: None, Even, or Odd

• Stop Bits: 1 or 2

• Maximum Distance: Up to 1200 m (At lower baud rates)

• Operating Temperature: 0 to 55°C

• Weight: 0.3 kg

Engineering Advantages

The NFLR121-S50 optimizes multi-vendor system integration through robust serial engineering:

• Dual-Port Versatility: Two independent ports allow the controller to manage two separate serial networks simultaneously. This architecture permits an engineer to poll high-speed power meters on one port while communicating with legacy sensor arrays on the second.

• Long-Distance Connectivity: The RS-422/RS-485 differential signaling supports cable runs up to 1200 meters. This capability eliminates the need for expensive repeaters when interfacing with remote field devices in large-scale plants.

• Flexible Protocol Support: By supporting both ASCII and Binary transmission with configurable character lengths and parity, the NFLR121-S50 communicates with a vast range of Modbus-RTU and proprietary serial devices.

• Multipoint Network Stability: The module handles complex multipoint connections effectively. Integrated circuitry manages the transceiver switching for half-duplex RS-485 loops, preventing data collisions and ensuring high network uptime.

• Hardware-Level Reliability: The 0.3 kg compact design withstands the vibrations found in standard industrial cabinets. The module integrates directly into the FCN baseplate, drawing power from the system bus and reducing external wiring complexity.

FAQs

Q: Can I use Port 1 for RS-422 and Port 2 for RS-485 simultaneously?

A: Yes. Each port functions independently. You can configure the hardware jumpers and software settings for each port to match the specific requirements of the connected field devices.

Q: Does the NFLR121-S50 require external termination resistors?

A: For long-distance RS-485 communication or high baud rates, you must install a 120-ohm termination resistor at the end of the bus to prevent signal reflections. Consult the wiring diagram for specific terminal locations.

Q: Is this module compatible with the FCN-500 controller series?

A: Absolutely. The "S50" suffix represents the current hardware revision designed for the FCN-500 and FCN-RTU architectures within the STARDOM ecosystem.

Q: How do I verify the module's "Brand New" condition?

A: Every NFLR121-S50 arrives in its original factory box with the manufacturer’s seal intact. Each unit includes a unique serial number and a factory inspection certificate to ensure 100% authenticity.