Description

ALR121‑S50 Yokogawa Serial Communication Module

Technical Specifications

• Product Model: ALR121‑S50
• Brand: Yokogawa
• Warranty: One Year
• Module Type: Dual‑port RS‑422/RS‑485 serial communication module for Centum‑VP
• Protocol Support: Modbus RTU slave, subsystem serial communication
• Baud Rate: 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps selectable
• Interface: Isolated RS‑422 / RS‑485, half‑duplex
• Mounting: Installable on ANB10D node unit or AFV‑series FCS station
• Operating Temperature: 0 °C ~ +50 °C
• Storage Temperature: ‑40 °C ~ +85 °C
• Protection Class: IP20 single‑slot plug‑in module
• System Compatibility: Yokogawa Centum‑VP DCS, N‑IO FIO hardware platform
• Diagnostics: Communication‑status LED, module self‑diagnosis
• Humidity: 5‑95 % RH non‑condensing
• Weight: 0.32 kg
• Dimensions: Standard N‑IO single‑slot module footprint
• 

Product Overview

ALR121‑S50 is dual‑port serial communication module for Yokogawa Centum‑VP DCS. It provides Modbus RTU slave interface for external Modbus master devices to read‑write DCS process data, also supports serial data exchange with third‑party subsystem controllers. Widely used for DCS‑to‑third‑party‑device gateway communication applications. Surplus and refurbished tested spare serial‑communication module.

Application Notes

‑ Set station address, baud‑rate and protocol parameters via Yokogawa engineering software. ‑ Use shielded twisted‑pair cable for RS‑485/RS‑422 wiring. ‑ Typical deployment: Centum‑VP DCS serial communication module spare‑part stocking.