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Function-mappings consists of a single destination function and one or more source functions. A function-mapping will be applied if any of the source functions defined in a function-mapping reach any of the input ports of a failure mode and are not being blocked. For example, if a function-mapping defines three source functions then any of the three functions will be mapped to the destination function. The mapped function will be propagated to all the output ports of the failure mode.
When computing function propagation, blockers are applied first and then function mappings are applied. For example, if function-1 is blocked and is also defined in a function mapper as a source function, TEAMS-Designer will not apply the function mapper to the already blocked function.
If the Mapped functions button is not visible, go to Tools -> Options… and enable Use Mapping and Blocking Functions option. If the button is greyed out, it means that the module is not a failure mode (lowest-level module). Only failure modes may have function mappers and blockers defined.