products

FEATURES The key features of the FBM204 are:  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 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 FBM204  TA for use with 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. HIGH ACCURACY For high accuracy, the module incorporates SigmaDelta 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 electromagnetic noise. STANDARD DESIGN FBM204 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. VISUAL INDICATORS Light-emitting diodes (LEDs) incorporated into the front of the module provide visual status indications of Fieldbus Module functions. EASY REMOVAL/REPLACEMENT The module can be removed/replaced without removing field device termination cabling, or power or communications cabling. FIELDBUS COMMUNICATION A Fieldbus Communications Module or a Control Processor interfaces to the redundant 2 Mbps module Fieldbus used by the FBMs. The FBM accepts communication from either path (A or B) of the 2 Mbps Fieldbus — should one path fail or be switched at the system level, the module continues communication over the active path. MODULAR BASEPLATE MOUNTING The module mounts on a DIN rail mounted Modular baseplate, which accommodates up to four or eight Fieldbus Modules. 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 the FBM204 are described in “TERMINATION ASSEMBLIES AND CABLES” on page 6.