FOXBORO FBM245

A redundant pair of FBM245 modules perform the signal conversion required to interface electrical input/output signals from field sensors and actuators to the redundant module Fieldbus. Each module contains four 0 to 20 mA galvanically isolated analog input and output channels (eight total). They support any mix of standard 4 to 20 mA devices and HART devices up to the limits of loop resistance, as shown in Figure 1. 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. A redundant analog input block and redundant analog output block in the Foxboro™ DCS Control Software validates each input and output in conjunction with information to or from the module. When a failure is detected in an FBM245, its output is driven to 0 mA, and the corresponding channel in the good module automatically continues supplying the proper current to the output current loop.

Features 

 • Four 0 to 20 mA analog input channels, used for a HARTanalog sensor input

 • 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 Foxboro DCS. All channels are galvanically isolated. 

 • Rugged design suitable for enclosure in harsh environments (Class G3) per ISA Standard S71.04.

 • Termination Assemblies (TAs) for locally or remotely connecting field wiring to the FBM245 

 • Channels may be powered from sources internal to Foxboro DCS or from external sources 

Email: [email protected]

一对冗余的FBM245模块执行所需的信号转换，将来自现场传感器和执行器的电气输入/输出信号连接到冗余模块现场总线。每个模块包含四个0至20mA的电隔离模拟输入和输出通道（共八个）。它们支持标准4至20mA设备和HART设备的任何组合，最高可达回路电阻的极限，如图1所示。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。Foxboro™DCS控制软件中的冗余模拟输入块和冗余模拟输出块验证每个输入和输出以及模块的信息。当在FBM245中检测到故障时，其输出被驱动到0 mA，良好模块中的相应通道会自动继续向输出电流回路提供适当的电流。

特性
•四个0至20mA模拟输入通道，用于HARTanalog传感器输入
•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 DCS连接所需的HART通用命令。所有通道都是电隔离的。 
•根据ISA标准S71.04，坚固的设计适用于恶劣环境（G3级）中的外壳。
•用于将现场接线本地或远程连接到FBM245的端接组件（TA）
•通道可由Foxboro DCS内部电源或外部电源供电

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