AMIKONG EXCESS CONTROL SYSTEM PARTS
Specializing In:Automation Spares(DCS, PLC, CNC) Servo Drives HMI Power supplies Controllers
-
Please try to be as accurate as possible with your search.
-
We can quote you on 1000s of specialist parts, even if they are not listed on our website.
-
We can't find any results for “”.
SEE PRODUCTS IN SEARCH PAGE ()
- Home
- ALL MANUFACTURERS
- Yokogawa
- Yokogawa Centum XL
- ALR121-S51 S1
ALR121-S51 S1
Need Help? Contact US!
Call us: +86-18020776786
Proper, Ready.
Delivery time
Please indicate your delivery time
Product Information
Product Describe
ALR121S51
SERIAL COMMUNICATION MODULE
RS-422/RS-485
2 PORT
SERIAL COMMUNICATION MODULE
RS-422/RS-485
2 PORT
Technical specifications for ALR121-S51 S1
-
Product ModelALR121-S51 S1
-
Spare ModelALR121-S51
-
Product ParametersCommunication Module
-
Tariff Code8537101190
-
Country of originjapan
-
Place of shipmentXiamen, China
-
Estimated Shipping Size3.2x10.6x13cm
-
ManufacturerYokogawa
-
Weight0.32 kg
-
Synchronization methodStart-stop synchronization
-
Transmission speed1200/2400/4800/9600/19200/38400 bps
-
InterfaceRS-422/RS-485 (4-wire system)
-
Connection methodPoint-to-point (RS-422) Multipoint (RS-485)
-
Communication functionHalf-duplex
-
Transmission codebinary
-
Character length8 bits
-
Stop bit length1/2 bits
-
Factory New
These are new and current items that are procured from the manufacturer. -
New No Package
These parts are new. They have not been used, but their original packaging is no longer available. -
New In Opened Package
These parts are new. They have not been used, but their original packaging has been opened or the packaging is significantly aged. -
New In Sealed Package
Parts are new. They have not been used and still have their original package seal intact. -
New in Original Package
These parts are new. The packages were not originally sealed by their original manufacturer.
Warranty Period & Disclaimer
Amikon is not an authorized distributor unless otherwise specified, representative, or affiliate of the manufacturer of this product. All trademarks and documents are the property of their respective owners and are provided for identification and informational.
FAQs
-
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.
Get a quick price fo ALR121-S51 S1
whatsapp
Inquiry
Our customer support team is always on call to help you with any form of consultation. You can inquire by phone or use us on the product page and "contact us" View Amikon terms and conditions
Product
MORE INFORMATION
Overview
Manuals
Technical 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.
- What Happens Next
-
Get the quote now Write Email to: INFO@AMIKON.CNEmail confirmation You will get an email confirming that we have received your enquiry.Dedicated Account Manager One of our team will be in touch to confirm your part(s) specification and condition.Your quote You will receive a comprehensive quote tailored to your specific needs.Need Moore Help? Get fast and efficient help from our experienced sales or customer service teams.
- Delivery and Payment
-
Delivery
Logistic partners UPS, FedEx and DHL
International delivery available
Same day dispatch from warehouse inventory
Warranty
All parts new original are covered by Amikon 12 month warranty
Returns
No hassle returns policy
Dedicated customer support team
Payment options
We accept Bank transfers and the following methods of payment:
For more information, please visit our dedicated payments page.
- Why Choose Amikon Limited?
-
When it comes to industrial automation, reliability, speed, and trust matter. At Amikon Limited, we go beyond just supplying parts — we deliver confidence.
- ● Extensive Inventory Reach: Nearly 1 million automation parts at your fingertips, including legacy and obsolete models.
- ● 20+ Years of Expertise: Trusted by engineers, project managers and government companies worldwide for our professional service.
- ● Quality You Can Trust: Each unit is strictly inspected by the warehouse staff to ensure product quality
- ● Fast Global Shipping: We help you minimize downtime with express logistics worldwide.
- ● 1-Year Warranty Available: Peace of mind with every purchase backed by one year warranty guarantee.
Whether you're maintaining legacy systems or building future-ready projects, Amikon Limited is your dependable partner in precision and performance.
Product
Top Product Yokogawa
- Yokogawa AIP826 Operator Keyboard
- Yokogawa CC0*A CC0 Module
- Yokogawa KB89*A Keyboard
- Yokogawa NC4*B NC4* B Nest Common Card
- Yokogawa ST4*D Multi Status Input Card
- Yokogawa VM2*D VM2 *D Multipoint Analog I/O Card
- Yokogawa AFV10D-S41211 Duplexed Field Control Unit
- Yokogawa NFSB100-S50 SB bus repeat module
- Yokogawa NFDR541-P50 Relay Output Module
- Yokogawa SDV531-L23 Output Module
Manufacturers
We stock thousands of automation and control components from leading OEMs, all accessible to you from a single place. If it’s not in stock, our multilingual team will scour the globe to find you the part you need for the best price.
Our world, made possible by manufacturing.
Manufacturing made possible by AMIKON.
Discover how we do our part to keep your production lines moving.
Watch the videoWe've got you covered
We give you access to a global supply of automation parts at your fingertips, ensuring that manufacturers around the world can avoid unnecessary downtime and continue to do what they do best – making our world possible.
-
Full 6-12-month warranty on all components -
Dedicated after-sales support
-
Same-day dispatch on 1000s of parts
-
All units are fully tested
Continue Searching
-
Please try to be as accurate as possible with your search.
-
We can quote you on 1000s of specialist parts, even if they are not listed on our website.
-
We can't find any results for “”.
SEE PRODUCTS IN SEARCH PAGE ()
- Q&A
- Policies How to order Part status information Shipping Method Return Policy Warranty Policy Payment Terms
- Asset Recovery
- We Buy Your Equipment. Industry Cases Amikong News Technical Resources
- ADDRESS
-
32D UNITS,GUOMAO BUILDING,NO 388 HUBIN SOUTH ROAD,SIMING DISTRICT,XIAMEN