描述
ABB TU921S是一款适用于危险区域的冗余终止单元，属于S900 I/O系统。以下是其产品详情：
基本信息
产品编号：3KDE175111L9210
信号类型：冗余终止单元
适用系统：S900 I/O系统
尺寸：宽度498mm，深度147mm，高度274mm
重量：3.79kg
功能特点
冗余设计：支持电源和通信的冗余，提高系统的可靠性和稳定性。
热插拔功能：具备热配置和热交换功能，可在运行过程中进行模块的更换和配置，无需中断系统运行。
本质安全：通过ATEX认证，可安装在危险区域1区，用于连接安装在2区、1区或0区的本质安全现场设备。
诊断功能：提供扩展诊断功能，可通过FDT/DTM进行配置和诊断，所有部件采用G3涂层，具备自动诊断功能，简化维修过程。
连接能力：可连接多达16个I/O模块，每个通道至多4个终端，支持现场总线地址的预选，为冗余系统电源和通信做好准备。
电气参数
工作电压：19.2-32V DC
功率消耗：50W
环境参数
工作温度：-20℃至+60℃
相对湿度：最大93%±3%（40℃时）
防护等级：IP20
The ABB TU921S is a redundant termination unit for hazardous areas and is part of the S900 I/O system.Product details are as follows:
Basic Information
Product Number:3KDE175111L9210
Signal Type:Redundant Termination Unit
Applicable System:S900 I/O System
Dimensions:Width 498mm,Depth 147mm,Height 274mm
Weight:3.79kg
Features
Redundant Design:Supports power and communication redundancy,improving system reliability and stability.
Hot-Swap Capability:Hot configuration and hot swap functionality allow modules to be replaced and configured during operation without interrupting system operation.
Intrinsically Safe:ATEX certified for installation in hazardous areas,Zone 1,for connecting intrinsically safe field devices installed in Zones 2,1,or 0.
Diagnostics:Provides extended diagnostic capabilities,allowing configuration and diagnostics via FDT/DTM.All components feature G3 coating and automatic diagnostics,simplifying maintenance.Connectivity:Up to 16 I/O modules can be connected,with up to 4 terminals per channel.Fieldbus address preselection is supported,providing for redundant system power and communication.
Electrical Parameters
Operating Voltage:19.2-32V DC
Power Consumption:50W
Environmental Parameters
Operating Temperature:-20°C to+60°C
Relative Humidity:Maximum 93%±3%(at 40°C)
Protection Rating:IP20
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