Foxboro DCS FBM204. 0 to 20 mAI/OModule

Foxboro  DCS  FBM204. 0 to 20 mAI/OModule

PSS41H-2S204

Product Specification

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FBM204

Overview

Features

High Accuracy

The FBM204. 0to 20 mAInput/Output contains four 20 mA dc analog input channels

and four 20 mA DCanalog 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 FBM204performs 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.

The FBM204is electrically compatible with standard HARTsignals.

• Four20mADCanaloginputchannels

• Four20mADCanalogoutputchannels

• Eachinput and output channel is galvanically isolated

• Ruggeddesignsuitable 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

• Highaccuracy achieved by sigma-delta data conversions for each channel

• Termination Assemblies (TAs) for locally or remotely connecting field wiring to the

Compact FBM204

• TAforusewith Output Bypass Station to maintain outputs during maintenance

operations

• 3-tier termination assembly for per channel internally and/or externally loop

powered transmitters

• Support for DPIDA control blocks

For high accuracy, the module incorporates Sigma-Delta data conversion on a per

channel basis, which provides new analog input readings every 25 ms, and a

configurable integration period to remove any process and/or noise and power line

frequencies.  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.

Standard Design

FBM204hasarugged extruded aluminum exterior for physical protection of the

circuits. Enclosures specially designed for mounting the FBMs provide various levels

of environmental protection, up to harsh environments, per ISA Standard S71.04.

Visual Indicators

Red andgreen light-emitting diodes (LEDs) incorporated into the front of the module

provide visual status indications of FBM functions.

Easy Removal/Replacement

The module mounts on a Compact 200 Series baseplate. Two screws on the FBM fix

the module to the baseplate. The module can be removed/replaced without removing

field device termination cabling, or power or communications cabling.

Fieldbus Communication

AFieldbus Communications Module or a Control Processor interfaces to the

redundant 2 Mbps module Fieldbus used by the FBM