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Overview
Essential details：FBM216 HART Communication Redundant Input Interface Module FOXBORO
Products Description
The FBM216 HART Communication Redundant Input Interface Module contains eight group-isolated input channels. The FBM216 supports any mix of standard 4 to 20 mA devices and HART devices. A pair of modules combines to provide redundancy at the Fieldbus Module (FBM) level, with field inputs wired to one common termination assembly (see Figure 1). In this configuration, one FBM216 is the Master, and the other is the Tracker.
The FBM216 serves as a HART communications field device host, enabling the I/A Series system to request and receive two digital messages per second from each field device. The message pass-through 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 (IFDC — refer to PSS 21S-8A2 B3 for details).
The FBM216 provides a common isolated power supply to power all eight channels. Optionally, the channels can be powered by an external power supply, in which case a Cable Balun module is required to prevent channel crosstalk.
HIGH ACCURACY
For high accuracy, the module incorporates a SigmaDelta converter which can provide new analog input values for each channel every 100 milliseconds.
COMPACT DESIGN
The FBM216 has a compact design, with a rugged extruded aluminum exterior for physical protection of the circuits. Enclosures specially designed for mounting the FBMs provide various levels of environmental protection, up to harsh environments per ISA Standard S71.04.
FBM216
REDUNDANT ANALOG INPUTS
For each input operation, identical reads are sent to both modules, fully exercising the Fieldbus and the logic circuitry of each module. Each input channel accepts an analog sensor input or a self-powered 4 to 20 mA source. Device power from each module is diode OR’d together in the redundant adapter to ensure redundant power.
The microprocessor of each module executes the analog I/O application program, plus security routines that validate the health of the FBM. Input channel security is enhanced by redundantly powering the input current loop from per-channel power supplies in each module of the pair.
VISUAL INDICATORS
Light-emitting diodes (LEDs) incorporated into the front of the module provide visual indication of the module’s operational and redundancy status, and communication activity on the channels. Two additional LEDs provide the master or tracker status of the modules.
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