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- ALR121-S51 S1
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We provide 1 year warranty for all remaining parts.
The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online.
If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.
Amikon offers a wide range of components, products and services related to industrial automation. We have a large surplus of stocks and are also distributors of new products from a variety of quality manufacturers.
Technical specifications for ALR121-S51 S1
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Product ModelALR121-S51 S1
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Spare ModelALR121-S51
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Product ParametersSerial communication modules
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Tariff Code8537101190
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Country of originjapan
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Place of shipmentXiamen, China
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In stock1 unit
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Estimated Shipping Size3.2x14.1x13cm
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ManufacturerYokogawa
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Weight0.3 kg
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Synchronization methodStart-stop synchronization
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Transmission speed1200/2400/4800/9600/19200/38400 bps
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InterfaceRS-422/RS-485 (4-wire system)
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Connection methodPoint-to-point (RS-422) Multipoint (RS-485)
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Communication functionHalf-duplex
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Transmission codebinary
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Character length8 bits
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Stop bit length1/2 bits
Description
The Yokogawa ALR121-S51 S1 Serial Communication Module is a dual-port communication interface module designed for the CENTUM VP and CENTUM CS 3000 Distributed Control System platforms. It enables reliable serial communication between Yokogawa Field Control Stations and external devices using RS-422 or RS-485 communication standards.
The module supports both point-to-point and multidrop communication architectures, making it suitable for integrating PLCs, motor control centers, power monitoring systems, analyzers, package equipment, and other intelligent electronic devices. Communication parameters such as baud rate, parity, character length, and stop bits can be configured to match connected equipment requirements
The module supports both point-to-point and multidrop communication architectures, making it suitable for integrating PLCs, motor control centers, power monitoring systems, analyzers, package equipment, and other intelligent electronic devices. Communication parameters such as baud rate, parity, character length, and stop bits can be configured to match connected equipment requirements
Alternative Names
ALR121-S51-S1
ALRI2I-S5I SI
ALR121-S51-S1
ALR121-S5I S1
ALR12I-S51 S1
ALRI21-S51 S1
ALR121 S51 S1
Information
Overview
Manuals
Application Notes
Product Applications
Comparison with Related Models
Features:
- Serial Communication Modules
- Dual-Port RS-422/RS-485 Interface
- Modbus RTU Master Protocol Support
- Long-Distance Transmission Capability
- Dual-Redundancy Operation
- High-Capacity I/O Image Are
The ALR121-S51 S1 Yokogawa Serial Communication Module may still be available for purchase and support from Amikon Limited beyond End-Of-Life (EOL) by the manufacturer (OEM).
Yokogawa ALR121-S51 S1 Serial Communication Module Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
This specific model features two RS-422/RS-485 serial ports that support point-to-point and multipoint configurations respectively, utilizing half-duplex start-stop synchronization at adjustable transmission speeds up to 38,400 bps. Through its native support of the Modbus RTU protocol, the ALR121 acts as a Modbus Master, organizing communication into 128 distinct definitions and storing up to 1000 words of data in its localized, asynchronous I/O image area. For high-availability plant environments where communication failure cannot be tolerated, the ALR121-S51 supports dual-redundancy. When deployed as a pair, both modules actively communicate with the subsystem and mirror the retrieved data, allowing for instantaneous, bumpless failover should the primary module experience a hardware or wiring fault.
- Energy & Power: Managing turbine control systems, boiler automation, and substation equipment
- Oil & Gas: Controlling extraction pumps, refining compressors, and safety instrumented systems
- Chemical & Petrochemical: Managing complex reactor sequences and distillation columns
- Water & Wastewater: Controlling large-scale pumping stations and treatment machinery
- Marine: Used in shipboard control systems
This content has been produced using multiple sources.Amikon takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
The Yokogawa ALR111 and ALR121 are Field Control Unit (FCU) serial communication modules used to interface CENTUM VP/CS 3000 DCS and ProSafe-RS systems with third-party subsystems. The primary difference is their physical hardware interface: the ALR111 uses RS-232C for short-distance, point-to-point connections, while the ALR121 uses RS-422/485 for long-distance and multidrop connections.
Technical notes
The module supports configurable baud rates and Modbus RTU protocol for integration with a wide range of industrial devices. Galvanic isolation between serial ports and the system backplane ensures reliable operation in electrically noisy environments.
The ALR121-S51 S1 is used in Yokogawa CENTUM CS 3000 and VP systems for serial device integration, protocol conversion, and multi-drop RS-485 network configurations. It carries CE and UL certifications.
FAQs
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What is the primary purpose of the ALR121-S51?
+It is used for serial subsystem communication. It allows your Yokogawa control system (FCS/SCS) to seamlessly exchange data with third-party devices (such as drives, sequencers, or other PLCs) using standard protocols like Modbus. -
What is the ALR121-S51 S1?
+The Yokogawa ALR121-S51 S1 is a dual-port serial communication module used in Yokogawa DCS (Distributed Control System) environments, such as the Centum VP and ProSafe-RS systems -
Does it support explosion protection or harsh environments?
+While the ALR121-S51 does not feature explosion-proof enclosures on the module itself, it does come with ISA Standard G3 coating, meaning it is highly protected against corrosive environmental gases typically found in industrial plants. -
What protocols does the module support?
+Primarily, it is utilized for Modbus (master or slave) communications. It can also be configured for other subsystem communication protocols such as FA-M3, MELSEC, or YS protocols.
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