This block imposes, during continuous-time integration of the model, that its output be equal to its input. Even though its behavior is comparable to a gain block of parameter 1, this block does not have a direct feed through dependency, so it can be used to break algebraic loops. Note that this block contains an implicit differential equation and thus will impose the use of an implicit solver.
Note that in the current version of Scicos, the Loopbreaker block does not impose its input-output equality constraint at event times.