Yokogawa ALR121-S53 S1 Serial Communication Module Excellent PLC Co.,Ltd

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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:0.3kg

Views:163

Payment Methods:T/T, PayPal, Western Union

Condition:New & In Stock

Shipping Port:Xiamen, China

Warranty:1 Year

Lead Time:1-3 Working Days

Certificate:COO

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

Business hours:7*24


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Company Information
E-mail [email protected]
Mobile +8613666033393
Whatsapp +8613666033393
WeChat 13666033393
Add Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China

Yokogawa ALR121-S53 S1 Serial Communication Module

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 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)

  1. What ports and protocol support does the ALR121‑S53 S1 provide?
    RS‑422 and RS‑485 with Modbus Slave and subsystem communication support.

  2. Is it suitable for redundant configurations?
    Yes, dual-module redundancy is supported.

  3. What are the maximum transmission distances?
    RS‑422 up to ~15 m; RS‑485 up to ~1200 m total.

  4. Which controllers is this module compatible with?
    Yokogawa SSC60, SSC50, SSC57, SSC10, and SNB10D units.

  5. What baud rates are supported?
    Ranges from 1,200 up to 38,400 bps.

  6. What is the device’s power consumption?
    Approximately 0.5 A.

  7. How heavy is the module?
    Approximately 0.3 kg.

  8. What are the exact dimensions?
    126.7mm × 32.8mm × 130 mm.

  9. Which communication functions can it perform?
    Modbus slave and subsystem communication.

  10. Does the module interfere with safety loops?
    No; it is designed to avoid interference with safety control systems.


Related Models

Model Number Description
ALR111‑S50 S1 RS‑232C serial communication module (single-channel)
ALR121‑S50 S1 Standard ALR121 serial module version
ALE111‑S51 Ethernet Communication Module
ALF111‑S01 Foundation Fieldbus H1 Link Active Scheduler Module
ALD112‑S00 S1 DeviceNet Communication Module
ALR121‑S53 S1 Dual Dual-redundant variant

Popular Yokogawa Modules

Model Number Description
AAV141‑S00 Analog Input Module (16-channel)
ADV561‑P00 Digital Output Module
ALE111‑S51‑S1 Ethernet Communication Module
ALF111‑S01 Fieldbus Communication (LAS) Module
ALD112‑S00 S1 DeviceNet Communication Module
AAI141‑S03 High-precision Analog Input Module

Frequently Asked Questions (FAQ)

  1. What ports and protocol support does the ALR121‑S53 S1 provide?
    RS‑422 and RS‑485 with Modbus Slave and subsystem communication support.

  2. Is it suitable for redundant configurations?
    Yes, dual-module redundancy is supported.

  3. What are the maximum transmission distances?
    RS‑422 up to ~15 m; RS‑485 up to ~1200 m total.

  4. Which controllers is this module compatible with?
    Yokogawa SSC60, SSC50, SSC57, SSC10, and SNB10D units.

  5. What baud rates are supported?
    Ranges from 1,200 up to 38,400 bps.

  6. What is the device’s power consumption?
    Approximately 0.5 A.

  7. How heavy is the module?
    Approximately 0.3 kg.

  8. What are the exact dimensions?
    126.7mm × 32.8mm × 130 mm.

  9. Which communication functions can it perform?
    Modbus slave and subsystem communication.

  10. Does the module interfere with safety loops?
    No; it is designed to avoid interference with safety control systems.

Related Models

Model Number Description
ALR111‑S50 S1 RS‑232C serial communication module (single-channel)
ALR121‑S50 S1 Standard ALR121 serial module version
ALE111‑S51 Ethernet Communication Module
ALF111‑S01 Foundation Fieldbus H1 Link Active Scheduler Module
ALD112‑S00 S1 DeviceNet Communication Module
ALR121‑S53 S1 Dual Dual-redundant variant

Popular Yokogawa Modules

Model Number Description
AAV141‑S00 Analog Input Module (16-channel)
ADV561‑P00 Digital Output Module
ALE111‑S51‑S1 Ethernet Communication Module
ALF111‑S01 Fieldbus Communication (LAS) Module
ALD112‑S00 S1 DeviceNet Communication Module
AAI141‑S03 High-precision Analog Input Module

Yokogawa ALR121-S53 S1 Serial Communication Module

Company Information
E-mail [email protected]
Mobile +8613666033393
Whatsapp +8613666033393
WeChat 13666033393
Add Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China

Excellent PLC Co., Ltd. has a large number of brand new and original PLC and DCS spare parts, with more than 60 cooperative countries. All products are guaranteed for 1 year and delivered to you by high-quality express. We are committed to using the best products and the most favorable prices to meet the needs and friendship of our customers. We have won the trust of thousands of customers, including these excellent customers.

As for the delivery time, when we receive your order requirements, we will arrange for warehouse personnel to test and verify the products. After you place the order, we will send it to you within 24 hours.

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