Description
A redundant pair of the Compact FBM208 combine to provide redundancy at the Fieldbus Module (FBM) level, with field I/O wired to one common termination assembly (see Figure 1). Each module independently attempts to hold the output(s) at its specified output value(s), and each independently reports its observed value of the inputs.
A redundant analog input and redundant analog output block in the Foxboro Evo™ Control Software validates each input and output in conjunction with information to/from the module.
The FBM208 is electrically compatible with standard HART signals.
Features
The Compact FBM208 features:
- Four 0 to 20 mA dc analog input channels
- Four 0 to 20 mA dc analog output channels with readback
- Compares FBM’s output value with the current readback value. If the readback value differs from the desired output by more than ± 2%, the FBM marks it’s output channel BAD
- Monitors FBM’s internal channel current loop power and marks the channel BAD if power is less than 16 V dc
- Marking a channel Bad causes the corresponding channel in the redundant module to continue to drive the outputs
- Redundant modules increase reliability
- Termination Assemblies (TAs) for locally or remotely connecting field wiring to the Compact FBM208.
Main brands include: ABB, Bailey, GE, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, EMERSON EMERSON, B&R, MOTOROLA, FUANC, REXROTH, KUKA, HONEYWELL, NI, DEIF, Yokogawa, WOODWARD WOODWARD, Ryan, SCHNEIDER SCHNEIDER, Yaskawa, MOOG, EPRO, PROSOFT and other major brands
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