FOXBORO FBM244

The FBM244 provides four input and four output communications channels, each is galvanically isolated from the others. The channels are capable of communicating HART® messages and are electrically compatible with 4 to 20 mA signals.

The FBM244 module contains four 0 to 20 mA galvanically isolated analog input and output channels (eight total). The FBM244 supports any mix of standard 4 to 20 mA devices and HART devices. Each input channel accepts an analog sensor input such as a 4 to 20 mA transmitter or a self-powered 20 mA source. Each output channel drives an external load and produces a 0 to 20 mA output. The module performs the signal conversion required to interface the electrical input/output signals from the field sensors and actuators to the redundant Fieldbus.This module executes the analog I/O application program. The configurable options for this program are Fail-Safe Configuration (Hold/Fallback), Analog Output Fail-Safe Fallback Data, (on a per channel basis), Fieldbus Switching Enable and Fieldbus Switching Time. The module does not provide DPIDA support.

Key features of the FBM244 module are: 

 Four 0 to 20 mA analog input channels, used for a HART analog sensor input such as a 4 to 20 mA transmitter or a self-powered 20 mA source 

 Four analog output channels, used to drive an external load and produce a 0 to 20 mA output 

 Support for the HART universal commands necessary to interface the field device with the Foxboro Evo™ system database Both inputs and outputs are galvanically isolated 

 Rugged design suitable for enclosure in Class G3 (harsh) environments 

 Termination Assemblies (TAs) for locally or remotely connecting field wiring to the FBM244 

 Termination Assemblies for per channel internally and/or externally loop powered transmitters.

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FBM244提供四个输入和四个输出通信通道，每个通道都与其他通道电隔离。这些通道能够传输HART®信息，并与4至20mA信号电气兼容。
FBM244模块包含四个0至20mA的电隔离模拟输入和输出通道（共八个）。FBM244支持标准4至20mA设备和HART设备的任意组合。每个输入通道接受模拟传感器输入，如4至20mA的变送器或自供电的20mA电源。每个输出通道驱动一个外部负载，并产生0至20mA的输出。该模块执行将现场传感器和执行器的电气输入/输出信号连接到冗余现场总线所需的信号转换。该模块执行模拟I/O应用程序。该程序的可配置选项包括故障安全配置（保持/回退）、模拟输出故障安全回退数据（基于每个通道）、现场总线切换启用和现场总线切换时间。该模块不提供DPIDA支持。

FBM244模块的主要特点是：
 四个0至20mA的模拟输入通道，用于HART模拟传感器输入，如4至20mA变送器或自供电20mA电源
 四个模拟输出通道，用于驱动外部负载并产生0至20mA的输出
 支持将现场设备与Foxboro Evo™系统数据库连接所需的HART通用命令。输入和输出都是电隔离的
 坚固的设计，适用于G3级（恶劣）环境中的外壳
 用于将现场接线本地或远程连接到FBM244的端接组件（TA）
 每个通道内部和/或外部回路供电变送器的端接组件。

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