Description
Overview
Essential details:FBM218 HART Communication Redundant Output Interface FOXBORO
Products Description
The Compact FBM218 module offers redundant modules for eight output channels, each providing a 4 to 20 mA output signal or a digital HART® signal superimposed on a 4 to 20 mA analog output signal (the signals are electrically compatible). The Compact HART Communication Redundant Output Interface Module (FBM218) contains eight channel-isolated output channels. The Compact FBM218 supports any mix of standard 4 to 20 mA devices and HART devices, and is part of the Compact 200 Series I/O subsystem described in Compact 200 Series I/O Subsystem Overview (PSS 41H-2COV).
A pair of the modules combines to provide redundancy at the Fieldbus Module (FBM) level, with field output signals wired to one common termination assembly (see Figure 1, page 4). In this configuration, one Compact FBM218 is the Master, and the other is the Tracker.
The Compact FBM218 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 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 more details, see Field Device Expert for HART Devices Control and I/O (PSS 41S-10FDMHRT). The module provides an isolated power supply for each channel.
Features
• 8 channel-isolated output channels, each providing one of the following outputs:
◦ Standard 4 to 20 mA analog output signal
◦ Digital HART Frequency Shift Keying (FSK) signal superimposed on a 4 to 20 mA analog output signal
• Module pair offers redundancy at the FBM level
• FSK modem dedicated to each output channel for bi-directional digital communications with a HART field device
• Support for HART universal commands necessary to interface the field device with the Foxboro DCS
• Galvanic isolation of all output channels from each other, from ground, and from module logic
• Compact, rugged design suitable for enclosure in Class G3 (harsh) environments
• Termination Assemblies (TAs) for locally or remotely connecting field wiring to the Compact FBM218
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