YOKOGAWA NFLR121-S51 S1 RS-422 RS-485 MODULE

Description:

The Yokogawa NFLR121-S51 S1 Serial Communication Module is used in STARDOM and field control systems to enable RS-422/RS-485 communication between PLC/DCS systems and external devices. Commonly installed in industrial automation systems such as chemical plants, power generation, and manufacturing environments where reliable serial data exchange is required. Maintenance teams, OEMs, and system integrators use this module for system communication, expansion of network interfaces, and replacement of communication modules.

Applications:

The Yokogawa NFLR121-S51 S1 is used in industrial control systems to establish serial communication with external equipment such as PLCs, analyzers, and subsystems. It is commonly deployed in distributed control systems, process plants, and automation networks where multipoint communication over RS-485 or point-to-point communication over RS-422 is required. The module supports data exchange for monitoring, control, and integration with third-party systems using standard industrial protocols.

Technical Specifications:

• Manufacturer: Yokogawa
• Model / Part Number: NFLR121-S51 S1
• Product Type: Serial Communication Module
• Interface: RS-422 / RS-485 (2 ports)
• Communication Type: Point-to-point (RS-422), multipoint (RS-485)
• Duplex Mode: Half-duplex / full-duplex (limited by wiring method)
• Transmission Speed: 0.3 kbps to 115.2 kbps
• Transmission Distance: Up to 1200 m (RS-485 network)
• Protocol Support: ASCII / binary communication
• Character Format: 7/8 bits, parity selectable, 1–2 stop bits
• Connection Type: Terminal block (M4 screw clamp)
• Current Consumption: Approx. 0.5 A
• Weight: Approx. 0.3–0.34 kg
• Function: Data communication between control system and external devices
• Application Environment: Industrial automation and process control systems

Common Replacements:

• Yokogawa NFLR111-S00
• Yokogawa ALR121 Communication Module
• Yokogawa NFCP100 with communication expansion module