描述
Yokogawa ALR121-S50是一款专为安全控制站（SCS）设计的串行通信模块，主要用于Modbus通信，支持冗余配置。以下是其产品详情：
基本信息
品牌：Yokogawa（横河）
型号：ALR121-S50
产品类型：串行通信模块
产地：日本
安装方式：标准DIN导轨安装
技术参数
通信接口：RS-422/RS-485（4线制）
通信协议：Modbus RTU
通信方式：半双工
传输速率：1200/2400/4800/9600/19200/38400/57600/115200bps（可配置）
最大节点数：32个（取决于通信速率和电缆长度）
传输距离：最长1200米（9600bps时，使用标准屏蔽电缆）
电气隔离：模块与安全回路隔离，隔离电压≥500V AC
电源消耗：约5W（典型值）
工作温度：-20°C至+60°C
湿度范围：5%至95%RH（无冷凝）
产品特点
支持冗余配置：可进行双冗余配置，当主通信路径故障时自动切换至备用路径，确保通信连续性。
配置灵活：支持多种通信参数配置，可通过系统软件配置波特率、数据位、停止位、奇偶校验等参数。
诊断功能：支持在线诊断通信状态，可通过LED指示灯或系统软件监控模块工作状态。
应用场景
安全仪表系统（SIS）：在紧急停机（ESD）、火灾与气体检测（F&G）等系统中，实现安全控制器与现场设备的可靠通信。
过程监控：连接温度、压力、流量等Modbus设备，采集实时数据并传输至控制系统。
设备集成：作为桥梁，将第三方Modbus设备集成到横河CENTUM VP或ProSafe-RS系统中。
Yokogawa ALR121-S50 is a serial communication module designed for Safety Control Station(SCS).It is mainly used for Modbus communication and supports redundant configuration.The following are product details:
Basic Information
Brand:Yokogawa
Model:ALR121-S50
Product Type:Serial Communication Module
Origin:Japan
Mounting Method:Standard DIN Rail Mounting
Technical Parameters
Communication Interface:RS-422/RS-485(4-wire)
Communication Protocol:Modbus RTU
Communication Mode:Half-duplex
Transmission Rate:1200/2400/4800/9600/19200/38400/57600/115200 bps(configurable)
Maximum Number of Nodes:32(depending on communication rate and cable length)
Transmission Distance:Up to 1200 meters(at 9600 bps,using standard shielded cable)
Electrical Isolation:Module isolated from safety circuit,isolation voltage≥500V AC
Power Consumption:Approximately 5W(typical)
Operating Temperature:-20°C to+60°C
Humidity Range:5%to 95%RH(non-condensing)
Product Features
Redundancy Support:Dual-redundancy configuration is supported.Automatically switches to the backup path when the primary communication path fails,ensuring communication continuity.
Flexible Configuration:Supports various communication parameter configurations,including baud rate,data bits,stop bits,and parity,which can be configured through the system software.
Diagnostics:Supports online communication status diagnosis,with LED indicators and system software monitoring of module operating status.
Application Scenarios
Safety Instrumented Systems(SIS):Enables reliable communication between safety controllers and field devices in systems such as emergency shutdown(ESD)and fire and gas detection(F&G).
Process Monitoring:Connects Modbus devices such as temperature,pressure,and flow to collect real-time data and transmit it to the control system.
Device Integration:Serves as a bridge to integrate third-party Modbus devices into Yokogawa CENTUM VP or ProSafe-RS systems.
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