Foxboro DCS FBM206 Pulse Input Module

Foxboro  DCS  FBM206Pulse Input Module

Overview

Features

Measurement of a machine's rotational speed is often accomplished using a device

that transmits high speed pulses. The FBM206 provides the means to accept up to

eight of these pulse signals (up to 25kHz) and provide the values to the Foxboro™

DCS. The FBM206baccepts up to four pulse inputs and provides up to four 0 to 20

mAoutputs for associated controls.

The FBM206contains eight pulse input channels, and the FBM206b provides four

pulse input channels and four 0 to 20 mA analog output channels. Each input channel

accepts a 2-wire, pulse input signal from a sensor. Input devices include vortex and

turbine meters, solid state or electromechanical contacts, and other sensors with

similar pulse outputs.

The modules perform the signal conversion required to interface the electrical input

signals from the field sensors to the redundant fieldbus.

• FortheFBM206.eight 7 to 27 VDC, configurable, pulse input channels

• FortheFBM206b,four 7 to 27 VDC,configurable, pulse input channels and four

0 to 20 mAanalog output channels

• Eachinput channel accepts a pulse input with a maximum rate of 25 kHz

• Eachchannel is galvanically isolated from the other channels and ground

• Ruggeddesignsuitable for enclosure in Class G3 (harsh) environments

• Execution of the pulse input application program with configurable options for

Pulse Rate Totalization and Resolution (on a per module basis) and Meter

Scaling Factor

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

FBM206/206b

• TAsforperchannel internally and/or externally loop powered devices

Standard Design

The FBM206/206b module has a rugged extruded aluminum exterior for physical

protection of the circuits. Enclosures specially designed for mounting the Fieldbus

Modules (FBMs) provide various levels of environmental protection, up to harsh

environments, per ISA Standard S71.04.

Visual Indicators

Light-emitting diodes (LEDs) incorporated into the front of the module provide visual

status indications of FBM functions.

Easy Removal/Replacement

The modules can be removed/replaced without removing field device termination

cabling, power or communication cabling

Fieldbus Communication

AFieldbus Communication Module or a Control Processor interfaces the 2 Mbps

module Fieldbus used by the FBMs. FBM206 accepts communication from either path

(A or B) of the redundant 2 Mbps Module Fieldbus. If one path is unsuccessful or is

switched at the system level, the module continues communication over the active

path.

Modular Module Mounting

The modules mount on a modular baseplate, which accommodates up to four or eight

FBMs. The modular baseplate is either DIN rail mounted or rack mounted, and

includes signal connectors for redundant fieldbus, redundant independent DC power,

and termination cables.

Termination Assemblies

Field I/O signals connect to the FBM subsystem via DIN rail mounted TAs. The TAs

used with FBM206 are described in Functional Specifications- Termination

Assemblies, page 12.

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