Algebraic loop when impementing switching system dynamics using If-Else Action Subsystems

MathWorks Support Team

2016 10 4

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I have a Simulink model that consists of multiple 'If action subsystems' in a sequence, each modeling a plant with certain dynamics and each feeding the final value of its state as the initial condition to the next plant. The control input to all the plants (subsystems) is a feedback signal. When I try to run the model, I see an error message that says

'Input data dependency validation error'.

Why is this so?

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MathWorks Support Team 2016-10-4

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Please check the model for any algebraic loops. This is likely a causality problem, where at the first time step, there is no output available to generate the control input. This can be corrected by passing the output feedback signal through a Unit Delay block.