Yokogawa NFLR121-S00 S1 Serial Communication Module

Technical Performance and Network Versatility

The Yokogawa NFLR121-S00 S1 actively functions as a high-performance Serial Communication Module within the CENTUM series and various PLC architectures. This module provides dual RS-422/RS-485 ports, which allow operators to establish complex multipoint network connections across a plant floor. Because it supports both half-duplex and full-duplex communication modes, the unit offers unparalleled flexibility for bidirectional data exchange. Consequently, engineers can utilize this module to bridge the gap between main control stations and diverse peripheral field devices.

Data Integrity and Transmission Reliability

To ensure precise data synchronization, the NFLR121-S00 S1 employs a robust start-stop synchronization protocol. This mechanism actively manages data transmission in both ASCII and binary formats, catering to various legacy and modern industrial standards. Furthermore, the module enhances signal reliability by offering configurable character lengths (7 or 8 bits), adjustable stop bits (1 or 2), and multiple parity check options (None, Even, or Odd). These diagnostic layers effectively detect and mitigate transmission errors before they impact the broader control logic.

Long-Distance Connectivity and Efficiency

The Yokogawa NFLR121-S00 S1 excels in large-scale industrial layouts by supporting reliable data transmission over distances up to 1200 meters. Despite this long-range capability, the module maintains a highly efficient power profile, consuming only 500 mA of current. This low-heat dissipation design contributes to a longer lifecycle for both the module and the surrounding rack components. Additionally, the “S1” designation confirms that this specific revision meets updated industrial standards for ruggedness and signal stability in high-interference environments.

Core Technical Specifications

• Manufacturer: Yokogawa Electric Corporation
• Model Number: NFLR121-S00 S1
• Module Type: Serial Communication Module (RS-422 / RS-485)
• Communication Ports: 2 Channels
• Transmission Distance: Maximum 1200 meters
• Current Consumption: 500 mA
• Synchronization: Start-Stop Synchronization
• Data Formats: ASCII or Binary
• Parity Options: None, Even, Odd
• Operating Modes: Half-duplex or Full-duplex
• Net Weight: 0.3 kg
• Dimensions: 3.2 x 14.1 x 13.0 cm
• Origin: Japan

Primary Industrial Applications

• Interfacing DCS controllers with third-party PLC systems.
• Managing long-distance communication with remote terminal units (RTU).
• Integrating analytical instruments and weigh scales into the control network.
• Coordinating data flow in chemical processing and oil refinery operations.