VisSim

Place to post questions relating to VisSim for modeling and simulation

Snap State Issue

Hi,

I am currently running a 27 000 blocks process simulation that is sending and receiving data from an excel spreadsheet using DDE. Unfortunatly I now can`t snap states without the simulation immediatly crashing.(Unexpected error message pop up)

Any possible lead to solve this greatlyt inconvenient problem would be appreciated.

Thanks,

Jerome

Any PID controller examples available?

I am a student and i was trying to simulate a PID controller. Are there any PID controller examples available? I would be very thankful.

With best regards,

Jose Luis Figueiredo.

Web view equivalent report viewer in Vissim?

Is there an equivalent of Web View report generator of Simulink in Vissim?

How do I reference simulation time as an input to my equations?

I'd like to do a simulation which requires time as an input variable as the simulation runs, is that available? -Duco

"pmsm32sim" example

In example of PMSM/BLDC FOC control ("pmsm32sim" example) SMO and QEP speed calculation are used for getting speed feedback.

Simulation works fine using measured rotor angle (theta) and rotor speed. Also, SMO gives great results of theta and motor speed. So I tryed to switch feedback from measured one to one which is calculated by SMO.

When theta is switched to be got from SMO then whole algorithm crushes. I don't know why it happens.

How can I look at the frequency spectrum of a portion of my data

Hi,

How can I look at the frequency spectrum of a portion of my data, say from 15 to 60- seconds rather than the full run of 0 to 60 seconds?

Thanks,

Joe

sine signal generation with specified SNR

I am able to generate a sine signal with specified oscillation frequency but I am unable to generate a sine signal with an snr of my own.Could anyone tell me how to do that in Vissim software?

Cannot Edit Statecharts

If I open any model with a statechart, C:\VisSim80\Examples\Applications\State Charts\stateChartTankFun.vsm for example, I cannot edit the statechart, i.e. add new states, edit transitions, actions, etc. I thought at first that this might be a licensing issue, but now I'm not so sure. Any help would be appreciated.

Algebraic loop on not-1098 detected.

I think VisSim doesn’t like the fact that the speed variable, which is downstream from the NOT block, is wrapped around to be one of the inputs before the NOT block. In a strictly digital simulation, this could cause a problem, but even then, you could have examples where outputs are wrapped around to eventually be inputs to a given logic block (e.g., a SR latch).

At any rate, if I ignore the warning message, the simulation works just fine. My question is, is there any way to tell VisSim not to display this warning message?

Regading Fixed point blocks

Hi I am not understanding what is the meaning of min value seen and max value seen in constant fixed point block. When I enter a value such as 5.62. The output of this block is shown as 5.61897 instead of 5.62 and the number 5.62 is within the range of the block. Why is it showing a closest number instead of exact number?

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