FOXBORO FBM243

The FBM243, FoxCom Dual Baud Rate, Intelligent Device Module contains eight individual channels. The FBM243b, FoxCom Dual Baud Rate, Intelligent Device Module contains four individual input channels and four 0 to 20 mA analog output channels.

Each input provides internal isolated power and digital communication capabilities to a Foxboro Intelligent Field Device. Each channel communicates over a single twisted pair of wires and each channel of the FBM243/243b is channel isolated. The modules also allow the use of an external power supply to power the Intelligent Field Device. (The use of an external power supply common to two or more loops needs the use of a cable balun module to maintain digital communication line balance). The baud rate is determined by the configuration of the field device connected to each channel, independently of the other channels. The modules provide bidirectional digital communication at 4800 baud rate between the Intelligent Field Device and the system redundant Fieldbus, or provides bidirectional digital communication at 600 baud rate between the field device and the modules while allowing a simultaneous 4 to 20 mA analog signal from the field device to an emergency shutdown system.

The FBM243/243b is an Intelligent Field Device host, enabling the system to receive digital messages from the field device in engineering units. Each message is received ten times per second at 4800 baud, and two times per second at 600 baud. Each message contains: 

 • Up to three measured variables in IEEE 32-bit floating-point format 

 • Security information

 • Diagnostics

 • Message checking 

This information is available to each of the elements of the system.

Since communication is bidirectional, the system can display the output, transmitter temperature (°C and °F), and the results of continuous self-diagnostics. In addition, the following information can be displayed or reconfigured from a console, a Field Communicator, or PC-Based Configurator: 

 • Output in engineering units

 • Fail-safe information • Tag number, name and location 

 • Device name (letterbug) 

 • Last calibration date

 • Two levels of upload/download capabilities 

When connected to the appropriate TAs, the FBM243/243b modules provide functionality formerly provided by the 100 Series FBM I/O subsystem. TAs are available for the FBM243 that support the functionality of the 100 Series FBM18 and FBM43.

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FBM243，FoxCom双波特率智能设备模块包含八个单独的通道。FBM243b，FoxCom双波特率智能设备模块包含四个单独的输入通道和四个0至20mA的模拟输出通道。
每个输入为Foxboro智能现场设备提供内部隔离电源和数字通信功能。每个通道通过一对双绞线进行通信，FBM243/243b的每个通道都是通道隔离的。这些模块还允许使用外部电源为智能现场设备供电。（使用两个或多个回路共用的外部电源需要使用电缆平衡-不平衡转换器模块来保持数字通信线路平衡）。波特率由连接到每个通道的现场设备的配置决定，与其他通道无关。这些模块在智能现场设备和系统冗余现场总线之间以4800波特率提供双向数字通信，或在现场设备和模块之间以600波特率提供单向数字通信，同时允许从现场设备向紧急停机系统同时发送4至20mA的模拟信号。

FBM243/243b是一个智能现场设备主机，使系统能够以工程单位从现场设备接收数字消息。每条消息以4800波特每秒接收十次，以600波特每秒接收两次。每条消息包含：
•最多三个IEEE 32位浮点格式的测量变量
•安全信息
•诊断
•消息检查
该信息可供系统的每个元素使用。

由于通信是双向的，系统可以显示输出、变送器温度（°C和°F）以及连续自诊断的结果。此外，可以从控制台、现场通信器或基于PC的配置器显示或重新配置以下信息：
•工程单位输出
•故障安全信息•标签号、名称和位置
•设备名称（letterbug）
•上次校准日期
•两级上传/下载功能
当连接到适当的TA时，FBM243/243b模块提供以前由100系列FBM I/O子系统提供的功能。TA可用于FBM243，支持100系列FBM18和FBM43的功能。

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