FOXBORO FBM216 HART® Communication Redundant Input Interface Module
FOXBORO FBM216 HART® Communication Redundant Input Interface Module
FBM216 HART® Communication Redundant Input Interface Module
The FBM216 offers redundant modules for eight input channels, each accepting a 4 to 20mA analog signal
or a digital HART® signal superimposed on a 4 to 20 mA analog signal.
FEATURES
Key features of the FBM216 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
signal.
Module pair offers redundancy at the FBM level
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 signal from the HART devices
Support for the HART universal commands
necessary to interface the field device with the
I/A Series® system database
Galvanic isolation of the group of 8 input
channels from ground and module logic
Compact, rugged design suitable for enclosure in
Class G3 (harsh) environments
High accuracy achieved by sigma-delta data
conversions for each channel
Termination Assemblies (TAs) for locally or
remotely connecting field wiring to the FBM216
Termination Assemblies for per channel internally
and/or externally loop powered transmitters.
FBM216
OVERVIEW
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 Sigma
Delta 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
HIGH RELIABILITY
The redundancy of the module pair, coupled with the
high coverage of faults, provides very high
subsystem availability time.
Either module may be replaced without upsetting
field input signals to the other module. A module can
be removed or replaced without removing field
device termination cabling, power, or
communications cabling.