FBM212 P0914XL  2 Thermocouple/mV Differential Input Module

The Differential Thermocouple/mV Input Module (FBM212) contains 14 differentially isolated
thermocouple input channels, and one differentially isolated RTD reference junction temperature
compensation channel (for terminal temperature sensing). Each thermocouple/mV channel accepts
standard thermocouples for various temperature ranges, and each provides thermocouple burnout
detection (up-scale). Each channel has a differential input to allow voltage differences between channels
without introducing errors.
The module performs the signal conversion required to interface the electrical input signals from the field
sensors to the optionally redundant Fieldbus. It executes an analog input application program, which
provides configurable options for Conversion Time and Rate of Change Limits.

FBM212-P0914XL

HIGH ACCURACY
For high accuracy, the module incorporates a multiplexed Sigma-Delta converter, which can
provide new analog input readings every 500 ms, and a configurable integration period to remove any
process noise and power line frequencies. Each update 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
FBM212 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.

FIELDBUS COMMUNICATION
A Fieldbus Communications Module or a Control Processor interfaces to the redundant 2 Mbps
module Fieldbus used by the FBMs. The FBM212 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 200 Series 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. For
applications which require CE certification, the baseplate and power supplies must be installed in a
metal rack. Open wall mounting in that case is not allowed.