FBM201

Foxboro FBM201 RH914SQ Analog Input Interface Module

OVERVIEW

Each FBM201/b/c/d Analog Input 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 5 V transmitter, or a self-powered 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. The FBM201 is electrically compatible with standard HARTsignals.

FEATURES

• 8 channels for input of analog sensor signals: 0 to 20 mA dc
• 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

High Accuracy

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.

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