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Description
Overview
Essential details：FBM203c Compact FBM203/c/d Platinum/Nickel/Copper RTD Input Modules FOXBORO
The Compact FBM203/c/d Platinum/Nickel/Copper RTD Input Interface Modules contain eight resistance temperature detector (RTD) input channels. Each input channel of the Compact FBM203/c modules accepts a 2- or 3-wire RTD sensor input, within a 0 to 320 ohm (FBM203), or 0 to 30 ohm (FBM203c) resistance range. Each input channel of the Compact FBM203d accepts a 4-wire RTD sensor input, within a 0 to 320 ohm resistance range. Each analog input is galvanically isolated from other channels and ground. It is part of the Compact 200 Series I/O subsystem described in Compact 200 Series I/O Subsystem Overview (PSS 41H-2COV).
The modules perform the signal conversion required to interface the electrical input signals from the field sensors to the optionally redundant fieldbus.
The Compact FBM203/c/d modules execute an analog input application program, which provides conversion time (on a per module basis) and configurable options for Rate of Change Limits.
TAs are available for FBM203c, which support the functionality of the 100 Series FBM33A when used with a 3-wire RTD input.
TAs are available for FBM203d, which support the functionality of the 100 Series FBM03B or FBM33B when used with a 2-wire or 4-wire RTD input.
FBM203c
Features
• 8 resistance temperature detector (RTD) input channels
• Each analog input is galvanically isolated
• 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 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 Compact FBM203/c/d
High Accuracy
For high accuracy, each channel incorporates a Sigma-Delta converter which can provide new analog input values for each channel every 25 ms, and a configurable integration period to remove any process noise and power line frequencies. Each time period, the Fieldbus Module (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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