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ALR121-S50 S1

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Yokogawa ALR121-S50 S1 is a two-port RS-422/RS-485 serial communication module for N-IO and FIO field control stations.
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Technical specifications for ALR121-S50 S1

  • Manufacturer:
    Yokogawa
  • Part Number:
    ALR121-S50 S1
  • Product Family:
    Centum CS-Centum VP
  • Product Type:
    Serial Communication Module
  • Stock:
    1
  • Interface:
    RS-422/RS-485
  • Connection method:
    Point-to-point (RS-422); Multipoint (RS-485)
  • Communication function:
    Half-duplex
  • Synchronization method:
    Start-stop synchronization
  • Transmission speed:
    1200/2400/4800/9600/19200/38400 bps
  • Transmission code:
    ASCII/binary
  • Character length:
    7/8 bits
  • Stop bit length:
    1/2 bits
  • Parity check:
    None/even/odd
  • Lag time after data transmission:
    1 ms (The lag time to start receiving data again after data transmission.)
  • Transmission distance:
    Maximum 1200 m (total extended length)
  • Installation method:
    ANB10, ANB11, AFV10, AFV30, AFV40, A2FV50, or A2FV70 series units
  • I/O wiring:
    Cable with 3-pair shield, AKB161, or AKB162
  • Wiring connection:
    Clamped with terminal block's M4 screws (5 poles x 2)
  • Current consumption:
    0.5 A
  • Weight:
    0.661 lbs (0.3 kg)
  • Estimated shipping dimensions:
    32.8 x 142.9 x 130 mm
  • Tariff Code:
    Please confirm the destination before shipping.
  • Country of origin:
    Japan
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Interface Modes System Integration Redundancy Setup

Features:

  • Dual serial ports: two RS-422/RS-485 communication interfaces
  • Flexible links: point-to-point RS-422 and multipoint RS-485 operation
  • Long-distance communication: up to 1200 m total extended length
The ALR121-S50 S1 configuration is a standard module without explosion protection and with the basic environmental option.

It connects a field control station to external subsystems through half-duplex serial communication with configurable protocol settings.

Confirm the subsystem protocol, baud rate, cable type, and supported host unit before installation.

Availability is subject to Apter Power inventory and sourcing confirmation.
Yokogawa ALR121-S50 S1 Serial Communication Module Specifications

General

  • ManufacturerYokogawa
  • ModelALR121-S50 S1
  • ConditionNew and factory sealed
  • Product FamilyN-IO/FIO Serial Communication Modules
  • RS-422: point-to-point connection for a direct subsystem link
  • RS-485: multipoint connection across the documented bus length
  • Transfer mode: half-duplex with start-stop synchronization
  • Data format: ASCII or binary with selectable character, stop-bit, and parity settings
  • Supported hosts: documented ANB, AFV, and A2FV node or control units
  • Subsystem access: supports documented FA-M3, Modbus, MELSEC-A, YS, SLC500, and PLC-5 functions
  • Port settings: both ports use the same selected communication function
  • Engineering: configure communication definitions through the supported CENTUM VP builder function
  • Module pair: install two identical ALR121 modules in adjacent even and odd slots
  • Control transfer: communication switches to the standby module after a detected module or subsystem fault
  • Port behavior: both ports switch control and standby sides together
  • Restriction: one-shot write cannot be used with dual-redundant communication
Description
The Yokogawa ALR121-S50 S1 is a two-port RS-422/RS-485 serial communication module for N-IO and FIO field control stations.

It supports half-duplex communication, start-stop synchronization, ASCII or binary data, and transmission speeds from 1200 to 38400 bps.

The S50 configuration is the standard type without explosion protection and with the basic environmental option.
Alternative Names
ALR121-S50 ALR121 S50 S1 Yokogawa ALR121-S50 ALR121 RS-422/RS-485 Module Yokogawa Serial Communication Module N-IO/FIO Serial Module CENTUM VP ALR121 Two-Port Serial Communication Module
Technical notes
ALR121-S50 S1 provides two RS-422/RS-485 ports with selectable speeds up to 38400 bps. Match the subsystem protocol and wiring before commissioning.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Which interfaces are available on ALR121-S50 S1?
It provides two RS-422/RS-485 serial communication ports.
Does ALR121-S50 S1 support point-to-point and multipoint links?
Yes. RS-422 supports point-to-point communication, while RS-485 supports multipoint communication.
Which serial speeds does ALR121-S50 S1 support?
Supported speeds are 1200, 2400, 4800, 9600, 19200, and 38400 bps.
What is the maximum RS-485 transmission distance?
Yokogawa specifies a maximum total extended length of 1200 m.
Where can ALR121-S50 S1 be installed?
It mounts on documented ANB10, ANB11, AFV10, AFV30, AFV40, A2FV50, or A2FV70 series units.
Can ALR121-S50 S1 communication be made dual-redundant?
Yes. Two identical modules are installed in adjacent slots for a dual-redundant arrangement.