Foxboro FBM204 Interface Module

OVERVIEW

The FBM204.0 to 20 mA Input/Output consists of four 20 mA dc analog input channels and four 20 mA dc analog output channels.

Each input channel accepts an analog sensor input or a self-powered 20 mA supply.

Each output channel drives an external load to produce a 0 to 20 mA output.

The inputs/outputs are electrically isolated from other inputs/outputs on channel and ground.

The FBM204 performs the signal conversion required for electrical input interfaces/output signals from field sensors to an optional redundant fieldbus.

The FBM204 performs analog I/O applications that provide configurable options for the following functions: conversion time,

Fail Safe Configuration (Hold/Return) and Analog Output Fail Safe Return Data (on a per channel basis).

The Fieldbus Module (FBM) can alternatively perform the fast control loops in which Distributed PIDA (DPIDA) applications provide operation.

The FBM204 is electrically compatible with standard HART signals.

Features

-Four 20 mA dc analog input channels

-Four 20 mA dc analog output channels

-Each input and output channel is galvanically isolated

-Ruggedized design for use in Class G3 (harsh) environment enclosures

-Performs analog I/O applications with configurable options for conversion time and change rate limits

-High accuracy through sigma-delta data conversion per channel

-Terminal assembly (TA) for local or remote connection of field wiring to the compact FBM204

-TA for output bypass station to maintain output operation during maintenance

3-tier terminal assembly power transmitter with internal and/or external loops for each channel

-Supports DPIDA control block with high accuracy

For high accuracy, the module provides new analog input readings every 25ms depending on the channel basis, as well as configurable integration cycles to eliminate any process and/or noise and power line

Frequency. the FBM converts each analog input to a digital value at each time period, averages these values over a period of time, and provides the average value to the controller.

Standard Design

The FBM204 has a rugged extruded aluminum housing circuit. The enclosure specifically designed for mounting the FBM is available in a variety of grades according to ISA standard S71.04. environmental protection in harsh environments.

The front of the Visual Indicator Module contains red and green light emitting diodes (LEDs) to provide visual status indication of FBM function.

Easy Removal/Replacement

The module is mounted to the Compact 200 Series baseplate. two screws on the FBM mounts attach the module to the baseplate. The module can be removed/replaced without disassembly for field device termination wiring or power or communications wiring.

Fieldbus Communication

The fieldbus communication module or control processor uses a redundant 2Mbps modular fieldbus with the FBM.The FBM accepts communication from either path (A or B) of the 2Mbps fieldbus. If a path is

unsuccessful or switched at the system level, the module continues to communicate on the active path.

Modular Baseboard Mounting

Modules are mounted on DIN-rail mounted modular baseplates* for up to four to eight FBMs. modular baseplates are DIN-rail or rack-mountable and include signal connectors for redundant fieldbuses, redundant independent DC power supplies, and termination cables.

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