Foxboro Evo FBM237 Analog Output Module

Foxboro Evo FBM237 Analog Output Module

The FBM237 contains eight 0-20 mA analog output channels. In situations where control system reliability is important, the FBM237 may have a redundant module installed. This permits all eight outputs to maintain operation in the presence of a single fault and during the time that the suspect module is removed and replaced. The 0-20 mA signals are electrically compatible with HART ®  field devices.

FEATURES

PHYSICAL DESIGN

REDUNDANT ANALOG OUTPUTS

HIGH RELIABILITY

The redundancy of the module pair, coupled with the high coverage of faults, provides a very high subsystem availability time. 

Either module in the redundant pair may be replaced without upsetting field output signals to the good module. 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 FBM237 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.

The module mounts on the Standard Modular baseplate, which accommodates up to 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. 

Redundant modules must be located in adjacent odd/even position pairs on the baseplate (positions 1 and 2, 3 and 4, 5 and 6, or 7 and 8). To achieve the redundant output, a redundant adapter module is placed on the two adjacent baseplate termination cable connectors to provide a single termination