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Yokogawa ALR121-S51 S1 Communication Module
Specifications
Model Number
ALR121-S51 S1
Communication Interface
RS-422 / RS-485
Connection Method
Point-to point (RS-422)、Multipoint (RS-485)
Character Length
7 bit / 8 bit
Stop Bit Length
1 bit / 2 bit
Lag Time After Data Transmission
1 ms
Maximum Transmission Distance
1200 m (total extended length)
I/O Wiring Cable
3-pair shielded cable, AKB161 or AKB162
Wiring Connection
Terminal block M4 screw fastening (5 poles × 2)
Current Consumption
0.5 A
Weight
0.3 kg
The Yokogawa ALR121-S51 S1 is a 2-port RS-422/RS-485 serial communication module used with Centum VP/CS
3000 safety control stations (SCS) or field control stations (FCS). It provides high-speed communication for field
instruments, PLC subsystems, and third-party controllers, supporting dual-redundant configurations for increased
reliability.
Product Applications
Oil and Gas: Applied in exploration, extraction and production environments.
Chemical & Downstream: Widely used in the process control systems of large chemical plants such as PetroChina,
Sinopec and CNOOC.
LNG Supply Chain: Used in the storage and transmission process of liquefied natural gas.
Power Generation: Applied in the systems of large power plants such as Huaneng and Datang.
Mining & Metallurgy: Including the control in harsh industrial environments such as steel mills and aluminum plants.
Water & Wastewater: Used in the management of public utility infrastructure.
Claim Your Extra Discount: Contact Sales Manager Lisa Lin for Details
:+86 18965423501 
:sales7@amikon.cn 
:AMKPLC
Payment & Delivery
Payment Term: T/T
Lead Time: Usually 2-3 days
Delivery Ways: DHL,UPS,TNT,CHIRLINE,FEDEX
Major Business
ABB: Industrial robot parts of DSQC series,Bailey INFI90, DCS
Honeywell: 51/MU/MC/TC/CC ...
Triconex: 3008/3511/3625/3664/3721/3700A..
Bently Nevada: 3500/3300/330180-Cable..
Foxboro: FBM203/204/217/231, FCP240/270
Woodward: SPC valve position controller, PEAK15 digital controller
Siemens: 6DD/6DP/6ES5/6DR/6GK Series
Westinghouse Series: 1C/5X ...
General electric: IC693/IC697/IC695/DS200..
Schneider: 140 Series
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