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HIGH ACCURACY For high accuracy, the module incorporates SigmaDelta data conversion on a per-channel basis, which can provide new analog input readings 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. COMPACT DESIGN FBM202 has a compact design, with 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 Red and green light-emitting diodes (LEDs) incorporated into the front of the module provide visual status indications of the FBM operational status. EASY REMOVAL/REPLACEMENT The module can be removed/replaced without removing field device termination cabling, 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 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 a:  DIN rail mounted TA, or  Baseplate-mounted TA. The TAs used with the FBM202 are described in “FUNCTIONAL SPECIFICATIONS – TERMINATION ASSEMBLIES” on page 8.