FBM201  Analog Input Module

• 8 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
• 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
• TAs for per channel internally and/or externally loop powered transmitters

FBM201

The FBM201/b/c/d modules have a rugged extruded aluminum exterior for physical
protection of the circuits. Enclosures specially designed for mounting the fieldbus
modules (FBMs) provide various levels of environmental protection, up to harsh
environments of Class G3 as defined in ISA Standard S71.04.

For high accuracy, the modules incorporate sigma-delta data conversion on a perchannel basis, which can provide a new analog input reading every 25 ms, and a
configurable integration period to remove any process and/or electromagnetic 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.

The modules mount on a modular baseplate (see Figure 1, page 5), 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.