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How do I store a value in Simulink (sample hold)?

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Martin
Martin on 22 Apr 2015
Answered: James Brown on 14 Feb 2017
I have a motor control system in Simulink-Realtime (fixed execution 16 kHz) and would like to display the average power per motor revolution (at 1 rev/s). The averaging is easy with a discrete integrator, but how do I store the final value? I want an updated display every motor turn. Currently I solved it by placing a memory block inside a triggered subsystem, but this seems overly complicated to me. Is there a more efficient way of implementing a sample-hold? As it is a real time system (62.5 us max. task execution time), I have to watch out for inefficient coding.

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James Brown
James Brown on 14 Feb 2017
I do this all the time with an enabled subsystem. Simply connect the input port to the output port inside the enabled subsystem. Configure the output port: "Output when disabled" to be 'held.' You can now raise the enable signal for one sample period whenever you want the data to be help. For example, pulse the enable port to high at one hertz to create a 1 second sample and hold.

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