FBM214B P0927AH FOXBORO Communication Input Module

An FBM214b provides up to eight HART® input channels. HART inputs are electrically compatible with 4-20 mA signals, permitting the plant to upgrade the field devices without changing the control system.

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 serves as a HART communications field device host, enabling the Foxboro Evo™ system to request and receive two digital messages per second from the field device. The message passthrough capability can be used to support HART universal, common practice, and device-specific commands, but not the burst communication mode. These commands are implemented using the Intelligent Field Device Configurator Foxcom™ and HART™ Protocols (IFDC - refer to PSS 21S-8A3 B3 for details).

The FBM214b provides individually isolated power supplies to power each of the eight channels. Optionally, the channels for both of these modules 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 prevent HART communication channel crosstalk.

Key features of the FBM214b module are:

 Eight 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 Evo system 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

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

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