FOXBORO FBM203 Evo™ Process Automation System Hardware

FOXBORO FBM203 Evo™  Process Automation  System Hardware

DESCRIPTION

Each input channel of the FBM203/b/c modules accept a 2- or 3-wire RTD sensor input, within a 0 to 320 ohm (FBM203), 0 to 640 ohm (FBM203b), or 0 to 30 ohm (FBM203c) resistance range. Each input channel of the FBM203d accepts a 4-wire RTD sensor input, within a 0 to 320 ohm resistance range. Each analog input is galvanically isolated from other channels and ground.

The modules perform the signal conversion required to interface the electrical input signals from the field sensors to the optionally redundant fieldbus.

The FBM203/b/c/d modules execute an analog input application program, which provides conversion time (on a per module basis) and configurable options for Rate of Change Limits.

Two types of passive termination assemblies are available for the FBM203/b/c modules:

 DIN rail mounted TAs, similar to those used with the other 200 Series FBMs 

 Baseplate-mounted TA, which mounts directly onto the field I/O connectors of the 200 Series baseplate. These TAs provide field I/O wiring

When connected to the appropriate TAs, the FBM203/c/d modules provide functionality formerly provided by the 100 Series FBM I/O subsystem. The FBM203 can be used with any version of Foxboro Evo™ Control Core Services software that supports I/O FBMs. TAs are available for FBM203 which support the functionality of the 100 Series FBM03A when used with a 3-wire RTD input.

The FBM203c is supported only by I/A Series® software V8.0 to V8.8 or Control Core Services software V9.0 or later. TAs are available for FBM203c, which support the functionality of the 100 Series FBM33A when used with a 3-wire RTD input.

FEATURES

Key features of FBM203/b/c/d modules are:

 Eight resistance temperature detector (RTD) input channels 

 Each analog input is galvanically isolated 

 Rugged design suitable for enclosure in Class G3 (harsh) environments 

 Execution of an analog input application program that provides conversion time and configurable 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 the FBM203/b/c/d.

HIGH ACCURACY

For high accuracy, each channel incorporates a Sigma-Delta converter which can provide new analog input values for each channel every 25 ms, and a configurable integration period to remove any process 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

FBM203/b/c/d have 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 and replaced without removing field device termination cabling, power, or communication cabling.

TERMINATION ASSEMBLIES

Field I/O signals connect to the FBM subsystem via a:

 DIN rail mounted termination assemblies (TAs), or 

 Baseplate-mounted TA (FBM203/b/c only).

DIN rail mounted TAs for the FBM203/b/c/d are available in the following forms:

 Compression screw type using Polyamide (PA) material 

 Ring lug type using Polyamide (PA) material

MODULAR BASEPLATE MOUNTING

The modules mount on a DIN rail mounted Modular Baseplate, which accommodates up to four or eight Fieldbus Modules. The baseplate is either DIN rail mounted or rack mounted, and includes signal connectors for redundant fieldbus, redundant independent DC power, and termination cables.