Parallel connection of two LTI systems.
Block Diagram
..........................
: +--------+ :
: +-->| sys1 |---+ :
u : | +--------+ |+ : y
-------+ O--------->
: | +--------+ |+ :
: +-->| sys2 |---+ :
: +--------+ :
:.........sys............:
sys = parallel (sys1, sys2)
Package: control