Our Products

Comprehensive industrial automation solutions for global industries

Home / Yokogawa / Yokogawa ALR121-S53 S1

Product Categories

Yokogawa ALR121-S53 S1 Serial Communication Module

Name: Yokogawa ALR121-S53 S1 Serial Communication Module
Brand: Yokogawa
Availability: InStock

Manufacturer:Yokogawa

Product Number:ALR121-S53 S1

Product Type:Serial Communication Module

Origin:Japan

Dimensions:126.7 × 32.8 × 130 mm

Weight:0.3kg

Views:68

Payment Methods:T/T, PayPal, Western Union

Condition:New & In Stock

Warranty:1 Year

Lead Time:1-3 Working Days

Certificate:COO

Courier partners:DHL, UPS, TNT, FedEx and EMS.

Business hours:7*24

Contact Sales

Product Description

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 it ideal for mission-critical automation systems.

Technical Specifications

Item	Specification
Model	ALR121‑S53 S1
Module Type	Serial Communication Module
Interface	RS‑422 / RS‑485 (4-wire system)
Number of Ports	2
Communication Mode	Half-duplex
Synchronization Method	Start-stop synchronization
Supported Baud Rates	1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps
Transmission Code	Binary
Character Length	8 bits
Parity	None, Even, Odd
Stop Bits	1 or 2
Lag Time Post Transmission	≈ 1 ms
Communication Distance	RS‑422: up to ≈ 15 m; RS‑485: up to ≈ 1200 m
Communication Functions	Modbus Slave, Subsystem Communication
Redundancy	Dual-redundant configuration supported
Installation Platforms	Yokogawa SSC60, SSC50, SSC57, SSC10, SNB10D units
Power Consumption	Approximately 0.5 A
Weight	0.3 kg
Dimensions	126.7 × 32.8 × 130 mm

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

Key Advantages

Dual RS-422/485 Ports allow flexible connectivity and redundancy
Wide Baud Support accommodates diverse application protocols
Robust Distance Support: up to 1200 m over RS‑485 networks
Redundant Configuration Support for critical system reliability
Compact and Lightweight (approx. 0.34 kg), easing rack-based installation
Low Power Usage (~0.5 A) and no interference with safety loops.
Seamless Integration with Yokogawa safety/control stations

Frequently Asked Questions (FAQ)

What ports and protocol support does the ALR121‑S53 S1 provide?

RS‑422 and RS‑485 with Modbus Slave and subsystem communication support.
Is it suitable for redundant configurations?

Yes, dual-module redundancy is supported.
What are the maximum transmission distances?

RS‑422 up to ~15 m; RS‑485 up to ~1200 m total.
Which controllers is this module compatible with?

Yokogawa SSC60, SSC50, SSC57, SSC10, and SNB10D units.
What baud rates are supported?

Ranges from 1,200 up to 38,400 bps.
What is the device’s power consumption?

Approximately 0.5 A.
How heavy is the module?

Approximately 0.3 kg.
What are the exact dimensions?

126.7mm × 32.8mm × 130 mm.
Which communication functions can it perform?

Modbus slave and subsystem communication.
Does the module interfere with safety loops?

No; it is designed to avoid interference with safety control systems.