sample error in simulink if else statement

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kpb
kpb 2016-2-25
评论： ashwani gupta 2021-8-9
When i am using if loop in matlab simulink it shows the error Sample time 1 of 'bdc_2_CL/Subsystem/If Action Subsystem/PID Controller/u' does not match the sample time [0, 0] of the If block 'bdc_2_CL/Subsystem/If' controlling its execution. this error is coming only when i am trying to connect closed loop simulation. In open loop it is perfectly working.In closed loop i have just added one adder and discrete PID controller
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ashwani gupta
ashwani gupta 2021-8-9
i will suggest a very crude way to tackle this problem. Just add one rate transition block before all the input signals of if block and it will resolve your problems.

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回答（2 个）

Sebastian Castro
Sebastian Castro 2016-2-25
Conditionally executed subsystems like your "If" block are not guaranteed to execute at every time step.
According to your error message, the PID Controller block inside this subsystem is set to Discrete mode with at sample time of 1. However, the PID Controller block inside cannot take a deterministic rate because it's inside the "If" block.
Go to the PID Controller block and change its sample time to -1, for "Inherit". Does that work?
- Sebastian
kpb
kpb 2016-2-26
No , I tried it before still it is not working , while in a closed loop system it works perfectly wid sample time -1.
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Sebastian Castro
Sebastian Castro 2016-2-26
Looking at your error again, there seems to be some block "u" in that subsystem set to a sample time of 1. Maybe an Inport/Outport block?

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