FOXBORO FBM227 P0927AC Module

OVERVIEW

The FBM227 module provides signal conversion

required to interface analog and digital electrical

input/output signals from field sensors/actuators.  It

has four 0 to 10 V DC analog input channels and two

0 to 10 V DC analog output channels, all of which are

individually isolated.  For the digital I/O signals (on/off

state), it has four digital input channels, isolated in

two groups of two channels each, and four digital,

pair isolated, output channels.

It executes either the Analog I/O or Digital I/O

application program, and has support for MDACT or

DPIDA control.

The configurable options for each analog program

are Input Resolution, Fail-safe Configuration

(Hold/Fallback) and Output Fail-safe Fallback Data.

The configurable options for each digital program are

Input Filter Time, Fail-safe Configuration, Fail-safe Fall

Back and Sustained or Momentary Outputs.

If the Momentary Output configuration is selected,

then Pulse Output Interval is also configurable.

Configurable options for inputs are exercised on a

per module basis; those for outputs are exercised on

a per channel basis.

FEATURES

Key features of the FBM227 module are:

 Four 0-10 V analog input channels, used for

either DC voltage measuring, or slidewire

(position) sensing

 Two 0-10 V analog output channels, used for

driving positioners, controllers or remote

indicators

 Four 130 V DC digital input channels, used for

either contact sensing, or DC voltage monitoring

Four digital output channels, used for either

60 V DC output switching with an external source

(e.g. to control powering of various external

loads), or a 3-wire DC output switching with an

internal 11 V DC source (e.g. to power external

solid state relays or other similar devices)

 Support for DPIDA and MDACT control blocks

 Each pair of analog input or output channels is

individually isolated from other channels and

earth (ground). Its digital channels have paired

isolation from all other channels and earth

(ground)

 Rugged design suitable for enclosure in Class G3

(harsh) environments.

STANDARD DESIGN

The FBM227 module has a rugged 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.

EASY REMOVAL/REPLACEMENT

The modules can be removed/replaced without

removing field device termination cabling, power or

communications cabling.

VISUAL INDICATORS

Light-emitting diodes (LEDs) incorporated into the

front of the modules provide visual status indications

of Fieldbus Module (FBM) functions.

MODULAR BASEPLATE MOUNTING

The modules mount on a modular baseplate or

conversion mounting structure 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.

FIELDBUS COMMUNICATION

A Fieldbus Communication Module or a Control

Processor communications with the FBM227 over

the redundant 2 Mbps module Fieldbus used by the

FBMs. The FBM227 module accepts communication

from either path (A or B) of the redundant 2 Mbps

fieldbus – should one path fail or be switched off at

the system level, the module continues

communication over the active path.

TERMINATION ASSEMBLIES

Field I/O signals connect to the FBM subsystem via

DIN rail mounted TAs. The TAs used with the

FBM227 modules are described in “TERMINATION

ASSEMBLIES AND CABLES” on page 8.