Yokogawa ALR121-S01 Communication Module – Obsolete CENTUM Series Spare Part

Name: Yokogawa ALR121-S01 Communication Module – Obsolete CENTUM Series Spare Part
Brand: Yokogawa

Model: ALR121-S01 S1

Brand Yokogawa

Series S01 Communication Module

Model ALR121-S01 S1

RFQ-ready model route Obsolete and surplus sourcing Export follow-up by model list

Product Overview

Commercial availability is handled through direct RFQ, model verification and export-oriented follow-up rather than public cart checkout.

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Datasheet Preview

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Commercial Path

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Technical Dossier

Product Details And Specifications

Yokogawa ALR121-S01 Communication Module – Obsolete CENTUM Series Spare Part

DriveKNMS maintains RFQ-reviewed sourcing status of the Yokogawa ALR121-S01 S1. This is not a broker listing. Availability is limited and not guaranteed beyond current inventory.

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Note: Electrical parameters not independently verified. Specifications are based on known CENTUM platform architecture. No parameters are fabricated. Buyers requiring exact electrical data should reference the original Yokogawa engineering documentation or contact our technical team.

Solving the Discontinued Hardware Crisis

The Yokogawa CENTUM platform — including CENTUM-XL, CENTUM CS, and CENTUM CS 3000 — was deployed extensively across refining, petrochemical, power generation, and pharmaceutical facilities throughout the 1990s and 2000s. Many of these installations remain operational today, not because replacement is impossible, but because the cost and risk of migration cannot be justified against current capital budgets.

The ALR121-S01 S1 communication module handles data exchange between field control stations (FCS) and engineering workstations or supervisory layers within the CENTUM bus architecture. When this module degrades or fails, the affected FCS loses its ability to communicate upstream. In a redundant configuration, the system may continue operating on the backup path — but that redundancy is now consumed. A second failure means a process shutdown.

Condition & Reliability Assurance

DriveKNMS applies a 5-step quality assurance process to all obsolete communication modules before dispatch review:

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