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Error while turning on and off pump with stateflow depending on physical signal

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I am trying to turn on and off a pump depending on the pressure within a hydraulic system. The pressure is measured within the system, feed into a stateflow chart, evaluated and then - depending on the current pressure - a pump is turned on and off through a stateflow output.
However this Setup gives me the error "stateflow chart updates a persistent or state variable while computing outputs, therfore it cannot be used in an algebraic loop."
How can I correct this error?
Thank you!

Accepted Answer

Alicia Roder
Alicia Roder on 20 Mar 2017
Adding a delay block in the algebraic Loop should solves the problem.

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