Is there an equivalent to the merge block but for the input of a block

I have a block ActionBlock that takes in input the bus : SignalA. The output of the block is a bus contaning the same data but updated : UpdatedSignalA.

How can I use ActionBlock in a loop (action called by a stateflow chart) so that it uses as input what would be the 'merge' -that is the latest updated version- of UpdatedSignalA and SignalA ?

The merge block doesn't work here because it takes as input the outputs of different cases.