Code generation problem about discrete PID Block

Hello,

I use the discrete PID block in my model. In simulation there's no problem, however when generating code some problems occurs.

Sample time of PID block is 100e-6. I must call the control block to hardware interrupt block (asyncronous) because of code generation. Therefore I change sample time to -1 and Integrator gain to IntegratorGain*SampleTime.

When analyzing generated code, Integrator gain is multiplied by elapsed time ('mode.block_ELAPS_T') variable which is calculated with Timing.clocTick value. I dont want to be added the elapsed time value because i use pid in pwm timer interrupt block (100e-6)

How to prohibit to generate elapsed time variable in c code. Thank you

Answer 1

[Navaneeth Raman]

Hello,

The integrator gain would remain a constant and not change with each timestep if you set its gain to be IntegratorGain*SampleTime where I assume SampleTime is a constant. Do you have a model that you can share so that I can take a look at it and figure out what is going on?

Thanks, Navaneeth

Answer 2

[YANBIN ZHAO]

Hi, SayGin:

Can not understand why in generated code, Integration Gain is not a constant. Can you share the model which is related with Integration Gain?

ZYB 2015.07.19