Foxboro FBM204 I/O Module The FBM204, 0 to 20 mA Input/Output contains four 20 mA dc analog input channels and four 20 mA dc analog output channels. Each input channel accepts an analog sensor input such as a 4 to 20 mA transmitter, or a self-powered 20 mA source. Each output channel drives an external load and produces a 0 to 20 mA output.
The inputs/outputs are galvanically isolated from other channels and ground. The FBM204 performs the signal conversion required to interface the electrical input/ output signals from the field sensors to the optionally redundant fieldbus.
The FBM204 executes the Analog I/O application program, which provides the following configurable options: Conversion Time, Fail-Safe Configuration (Hold/Fallback), and Analog Output Fail-Safe Fallback Data (on a per channel basis). The Fieldbus Module (FBM) may instead execute a distributed PIDA (DPIDA) application program to provide a fast control loop running in it.
Features • Four 20 mA dc analog input channels • Four 20 mA dc analog output channels • Each input and output channel is galvanically isolated • Rugged design suitable for enclosure in Class G3 (harsh) environments • Execution of an analog I/O 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 FBM204 • TA for use with Output Bypass Station to maintain outputs during maintenance operations • 3-tier termination assembly for per channel internally and/or externally loop powered transmitters
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