AddFEM
Mode of Operation
3-11
AddFEM
C79000–G8076–C900–03
Master/Reserve Changeover
The master module has the control until it recognizes an error in itself after which it
hands the master state over to the reserve module.
Master/Reserve Changeover without Optical–fiber Cable
When the optical–fiber cable coupling fails the master/reserve assignment is deci-
ded by the Host. The current error weighting of the modules is decisive for the as-
signment.
Process Inputs and Outputs
Redundant AddFEMs have to assigned absolutely symmetrically with I/O signals.
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