FOXBORO FBM201E

Description

The FBM201/b/c/d Analog Input Interface Modules provide eight dc current or dc voltage input channels.
FEATURES
Key features of the FBM201/b/c/d modules are:
 Eight channels for input of analog sensor signals:
0 to 20 mA dc – FBM201
0 to 100 mV dc – FBM201b
0 to 5 V dc – FBM201c
0 to 10 V dc – FBM201d
 Each analog input channel is galvanically isolated
from other channels and ground
 Compact, rugged design suitable for enclosure in
Class G3 (harsh) environments
 Execution of an analog input application program
that provides conversion time and configurable
options for integration time and Rate of Change
Limits
 High accuracy achieved by sigma-delta data
conversions for each channel
 Termination Assemblies (TAs) for locally or
remotely connecting field wiring to the
FBM201/b/c/d modules
 Termination Assemblies for per channel internally
and/or externally loop powered transmitters.OVERVIEW
Each FBM201/b/c/d Analog Input Interface Module
contains eight analog input channels, each channel
accepting a 2-wire, dc input from an analog sensor
such as a 4 to 20 mA or 0 to 5V transmitter, or a selfpowered 20 mA source.
The modules perform the signal conversion required
to interface the electrical input signals from the field
sensors to the optionally redundant fieldbus.
When connected to the appropriate TAs, the
FBM201 module provides functionality formerly
provided by the 100 Series FBM I/O subsystem. TAs
are available which support the functionality of the
100 Series FBM01 when the FBM01 is used with
non-HART® devices.
COMPACT DESIGN
The FBM201/b/c/d modules have 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 ACCURACY
For high accuracy, the modules incorporate sigmadelta data conversion on a per-channel basis, which
can provide a new analog input reading every 25 ms,
and a configurable integration period to remove any
process noise and power-line frequency noise.
Each time period, the FBM converts each analog
input to a digital value, averages these values over
the time period, and provides the averaged value to
the controller.
EASY REMOVAL/REPLACEMENT
The modules can be removed/replaced without
removing field device termination cabling, power or
communications cabling.
VISUAL INDICATORS
Light-emitting diodes (LEDs) incorporated into the
front of the modules provide visual status indications
of Fieldbus Module (FBM) functions.
MODULAR BASEPLATE MOUNTING
The modules mount on a modular baseplate (see
Figure 1) which accommodates up to four or eight
FBMs. The modular baseplate is either DIN rail
mounted or rack mounted, and includes signal
connectors for redundant fieldbus, redundant
independent dc power, and termination cables.
FIELDBUS COMMUNICATION
A Fieldbus Communication Module or a Control
Processor interfaces the redundant 2 Mbps module
Fieldbus used by the FBMs. The FBM201/b/c/d
modules accept communication from either path (A
or B) of the redundant 2 Mbps fieldbus – should one
path fail or be switched at the system level, the
module continues communication over the active
path.
TERMINATION ASSEMBLIES
Field I/O signals connect to the FBM subsystem via
DIN rail mounted TAs (see Figure 1). The TAs used
with the FBM201/b/c/d modules are described in
“TERMINATION ASSEMBLIES AND CABLES” on
page 8.