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Product Overview

Yokogawa | ALR111-S50 RS-232C 2-Port Serial Communication Module

ALR111-S50

The Yokogawa ALR111-S50 serial communication module provides high-reliability RS-232C connectivity between Yokogawa CENTUM distributed control systems and third-party subsystems such as PLCs, computers, and analyzers. Equipped with two independent D-sub 9-pin ports, 0.3 kg net weight, and support for Modbus and FA-M3 protocols, this module delivers stable half-duplex data transmission in demanding process control environments. Request pricing and stock availability today for genuine Yokogawa hardware.

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Yokogawa ALR111-S50 RS-232C 2-port serial communication module

Seamless Subsystem Integration for DCS Architectures

In industrial process control plants such as chemical refineries, power stations, and manufacturing facilities, integrating external intelligent devices—including programmable logic controllers, analyzers, and operator interfaces—into a central control system is critical for unified monitoring. The Yokogawa ALR111-S50 RS-232C Serial Communication Module serves as a specialized communication interface within Yokogawa CENTUM VP Field Control Stations (FCS) and node units. By bridging third-party serial hardware directly into the control architecture, the module enables real-time data acquisition and supervisory control without complex external protocol converters.

Dual Independent RS-232C Ports and Protocol Versatility

The ALR111-S50 module is equipped with two independent RS-232C channels terminating in standard D-sub 9-pin female connectors. Operating on half-duplex start-stop synchronization, each port supports configurable baud rates ranging from 1200 bps up to 38,400 bps.

The module natively supports multiple industrial communication protocols—including FA-M3, Modbus (RTU/ASCII), and MELSEC-A communications. This flexibility allows engineers to map up to 128 communication definitions per module, translating raw serial data directly into regulatory control and sequence function blocks within CENTUM VP control software.

Robust Redundancy and Physical Specifications

Designed for continuous 24/7 plant operations, the ALR111-S50 supports dual-redundant communication configurations when two identical modules are paired in adjacent even and odd slots of a node unit. Front-panel status indicators provide immediate visual feedback on module health and channel transmission activity. Weighing approximately 0.3 kg and consuming 0.5 A of current, the module installs smoothly into standard Field Control Units (such as AFV30, AFV40, AFV10) and ESB bus node racks.

Applications

  • Distributed Control Systems (DCS): Subsystem serial interfacing within Yokogawa CENTUM VP control architectures.

  • Oil & Gas Processing: Data acquisition from gas chromatographs, flow computers, and tank telemetry systems.

  • Chemical & Petrochemical Operations: Serial communication routing with packaged PLC skids and analytical instrumentation.

  • Power Generation Facilities: Integration with electrical protection relays, breaker monitors, and auxiliary controller units.

  • Water & Wastewater Treatment: Centralized supervisory control of remote telemetry units (RTUs) and dosing controllers.

Technical Specifications

  • Manufacturer: Yokogawa

  • Product Model: ALR111-S50

  • Product Type: Serial Communication Module (RS-232C, 2-Port)

  • Interface Standard: EIA RS-232C

  • Number of Ports: 2 ports (D-sub 9-pin female x 2)

  • Communication Function: Half-duplex, start-stop synchronization

  • Transmission Speed: 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps

  • Transmission Distance: Maximum 15 meters

  • Supported Protocols: FA-M3, Modbus, MELSEC-A, SLC500, PLC-S

  • Dual-Redundancy: Supported (paired in adjacent even/odd slots)

  • Current Consumption: 0.5 A

  • Module Net Weight: 0.3 kg

  • Compatible Control Units: AFV30, AFV40, AFV10, AFF50, ANB10, ANB11, ANR10 series

FAQ

Q1: What is the primary function of the Yokogawa ALR111-S50 module? A: The ALR111-S50 is a 2-port RS-232C serial communication module that connects Yokogawa CENTUM control systems with external subsystems like PLCs and analyzers.

Q2: What communication protocols does the ALR111-S50 support? A: According to the official specification sheet, it supports FA-M3, Modbus (RTU/ASCII), MELSEC-A, SLC500, and PLC-S communication functions.

Q3: Can the ALR111-S50 be configured for dual-redundant operation? A: Yes. Dual-redundant communication is supported by installing two identical modules in adjacent even and odd-numbered slots on the same node unit.

Q4: How can I request pricing and lead time information? A: Simply fill out the inquiry form on our website with your required model code and quantity to receive a prompt quotation.

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