Yokogawa ALR121-S53 S1 Serial Communication Module

Manufacturer: Yokogawa
Product Number: ALR121-S53 S1
Product Type: Serial Communication Module
Origin: Japan
Dimensions: 126.7 × 32.8 × 130 mm
Weight: 0.3 kg

Product Overview

The Yokogawa ALR121-S53 S1 is a serial communication module designed for integration within Yokogawa Safety Control Stations (SCS) and Field Control Station (FCS) platforms. It supports RS‑422 (point-to-point) and RS‑485 (multipoint) interfaces, enabling Modbus slave and subsystem communications with external devices such as PLCs and sequencers.

Dual serial ports and support for dual-redundant configuration make the ALR121-S53 S1 ideal for mission-critical automation systems.

Industry Applications

• Enables Modbus slave communication between Yokogawa SCS and external systems

• Facilitates subsystem communication (e.g., sequencers or PLCs)

• Supports fail-safe architectures in process and safety control environments

• Suitable for use in petrochemical, power generation, water treatment, and industrial automation facilities

• Ideal for long-distance serial communications in distributed installations