Foxboro FBM204 I/A Series Channel Isolated 4 Input 4 Output Module

Overview

 

The FBM204, 0 to 20 mA Input/Output contains four 20 mA dc analog input channelsand 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 andproduces a 0 to 20 mA output. The inputs/outputs are galvanically isolated from otherchannels 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 FBM204executes the Analog I/O application program, which provides the followingconfigurable options: Conversion Time, Fail-Safe Configuration (Hold/Fallback), andAnalog Output Fail-Safe Fallback Data (on a per channel basis). The Fieldbus Module(FBM) may instead execute a distributed PIDA (DPIDA) application program toprovide a fast control loop running in it.

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Specifications

 

Model: FBM204

Type: Channel-Isolated Analog Input/Output Module

Number of Input Channels: 4 isolated analog inputs

Number of Output Channels: 4 isolated analog outputs

Input Signal Type: Analog voltage or current

Output Signal Type: Analog voltage or current

Channel Isolation: Each channel is individually isolated

Accuracy: High precision for industrial control

Communication Protocol: Compatible with Foxboro I/A Series DCS

Power Supply: Standard industrial voltage

Mounting: Designed for Foxboro baseplates

Operating Temperature: -40°C to 70°C

Certifications: CE, UL, CSA

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• 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 andconfigurable 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 theCompact FBM204

• TA for use with Output Bypass Station to maintain outputs during maintenanceoperations

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

• Support for DPIDA control blocks

• High Accuracy

For high accuracy, the module incorporates Sigma-Delta data conversion on a perchannel basis, which provides new analog input readings every 25 ms, and aconfigurable integration period to remove any process and/or noise and power linefrequencies. 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 thecontroller.

• Standard Design

FBM204 has a rugged extruded aluminum exterior for physical protection of thecircuits. Enclosures specially designed for mounting the FBMs provide various levelsof environmental protection, up to harsh environments, per ISA Standard S71.04.

• Visual Indicators

Red and green light-emitting diodes (LEDs) incorporated into the front of the moduleprovide visual status indications of FBM functions.

• Easy Removal/Replacement

The module mounts on a Compact 200 Series baseplate. Two screws on the FBM fixthe module to the baseplate. The module can be removed/replaced without removingfield device termination cabling, or power or communications cabling.

• Fieldbus Communication

A Fieldbus Communications Module or a Control Processor interfaces to theredundant 2 Mbps module Fieldbus used by the FBMs. The FBM acceptscommunication from either path (A or B) of the 2 Mbps Fieldbus. If one path isunsuccessful or is switched at the system level, the module continues communicationover the active path.

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