FBM214b HART通信输入模块包含8个4至20 mA单独隔离的模拟输入通道。它支持标准4-20 mA设备和HART设备的任何组合。
FBM214b可以作为hart通信现场设备主机，使Foxboro™DCS每秒从现场设备请求和接收两个数字消息。消息传递功能可用于支持HART通用、通用实践和特定于设备的命令，但它不能支持突发通信模式。这些命令是使用Foxboro DCS实现的
HART现场设备专家。有关详细信息，请参见HART设备控制和I/O (PSS 41S-10FDMHRT)的现场设备专家。
FBM214b提供单独隔离的电源，为8个通道中的每个通道供电。
可选地，输入通道可以由外部电源供电。然而，当一个普通的外部电源与两个或多个通道一起使用时，需要一个电缆平衡模块来帮助防止hart通信通道串扰。
特性
•8个模拟输入通道，每个通道接受以下输入之一:
◦标准4至20 mA模拟传感器信号
◦数字HART频移键控(FSK)信号叠加在4至20 mA模拟输入信号
•FSK调制解调器专用于与HART现场设备双向数字通信的每个输入通道
•模拟到数字转换的每个4至20 mA输入信号从HART设备
•支持HART通用命令，将现场设备与Foxboro DCS数据库连接起来
•每个通道的电流隔离的8个输入通道彼此，接地和模块逻辑
•坚固耐用的设计适用于G3(恶劣)环境的外壳
•通过每个通道的sigma-delta数据转换实现高精度
•终端组件(TA)本地或远程连接现场布线到FBM214b
•每个通道内部和/或外部环路供电发射机的TA

FBM214B/216B RH924JH

The FBM214b HART Communication Input Module contains eight 4 to 20 mA individually isolated analog input channels. It supports any mix of standard 4-20 mA devices and HART devices.
The FBM214b can serve as a HARTcommunications field device host, enabling Foxboro™ DCS to request and receive two digital messages per second from the field device. The message pass-through capability can be used to support HART universal, common practice, and device-specific commands, but it cannot support the burst communication mode. These commands are implemented using the Foxboro DCS
Field Device Expert for HART. For details, see Field Device Expert for HART Devices Control and I/O (PSS 41S-10FDMHRT).
The FBM214b provides individually isolated power supplies to power each of the eight channels.
Optionally, the input channels can be powered by an external power supply. However, when a common external power supply is used with two or more channels, a Cable Balun module is required to help prevent HARTcommunication channel crosstalk.
Features
• 8 analog input channels, each accepting one of the following inputs:
◦ Standard 4 to 20 mA analog sensor signal
◦ Digital HART Frequency Shift Keying (FSK) signal superimposed on a 4 to 20 mA analog input signal
• FSK modem dedicated to each input channel for bi-directional digital communications with a HART field device
• Analog to digital conversion of each of the 4 to 20 mA input signals from the HART devices
• Support for the HART universal commands necessary to interface the field device with the Foxboro DCS database
• Per channel galvanic isolation of each of the 8 input channels from each other, ground and module logic
• Rugged design suitable for enclosure in Class G3 (harsh) environments
• High accuracy achieved by sigma-delta data conversions for each channel
• Termination Assembly (TA) for locally or remotely connecting field wiring to the FBM214b
• TA for per channel internally and/or externally loop powered transmitters

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