Yokogawa ALR121-S00 Serial Communication Module

Technical Specifications

Model:ALR121-S00

Brand:Yokogawa

Communication interface:RS-422 / RS-485

Operation mode:Half-duplex

Baud rate:1200,2400,4800,9600,19200,38400 bps

Data bit:7 / 8 bits

Stop bit:1 / 2 bits

Parity:None,Even,Odd

Max transmission distance:1200m

I/O data capacity:1000 words

Communication definition quantity:128 definitions

Isolation:1500V AC isolation between field bus and internal circuit

Operating temperature:-10~+60℃

Relative humidity:5~95% non-condensing

Weight:0.33kg

Certification:CE

System compatibility

Designed for Yokogawa CENTUM VP DCS FIO and N-IO FCS station,realize serial data exchange between DCS controller and external devices such as PLC,online analyzers,flow computers and field instruments,widely used in petrochemical,power,chemical refining process control.

Function

ALR121-S00 is serial communication module for CENTUM VP FIO and N-IO system.It supports RS-422 point-to-point and RS-485 multi-drop bus connection,half-duplex transmission.Realizes bidirectional serial data transmission between FCS and third-party equipment,configurable communication parameters including baud rate,parity and frame format via CENTUM VP engineering software.

Installation

Install on FCS node backplane slot,connect external serial devices via terminal connector or dedicated AKB series shielded cable,set communication parameters by CENTUM VP engineering software.Hot swap supported.

Interface

‑RS-422/RS-485 field serial terminal connector

‑Internal ESB bus backplane connector

‑LED indicators for run,communication and fault

Circuit feature

Isolated communication circuit,anti-electromagnetic interference,built-in communication self-check,stable long-distance transmission,adapt to noisy industrial site.

Feature

ALR121-S00 belongs to Yokogawa CENTUM VP FIO/N-IO series serial communication module.Common faults:terminal loose,shield cable grounding error,communication chip damage.Confirm firmware before replacement.

Diagnostic

Communication timeout,parity error,frame error or module hardware fault triggers alarm and upload diagnostic information to DCS controller.

Built‑in function

Realize serial communication between DCS FCS and third-party automation equipment,used for industrial DCS spare replacement.

Product Brief

ALR121-S00 is Yokogawa CENTUM VP FIO/N-IO RS-422/RS-485 serial communication module,half-duplex,max 1200m transmission.Check system hardware compatibility before ordering.ESD anti-static protection required during installation.