VisSim Message Board

importing from dwg

Ant — Mon, 14 Sep 2009 10:14:57 GMT

Hello,

Is it possible to import a dwg drawing to vissim? If not, is there a way to convert it to anm?

Thanks

Time delay and VisSim analyze...

JonP — Tue, 02 Jun 2009 07:03:08 GMT

For years I have tried to make a proper frecvency respons for systems with timedelay. Is there anyone that know how to do it?

Forum: VisSim

Looking for a way to make life easier

BBpeter — Sun, 17 May 2009 19:34:09 GMT

Hello, Im looking for a way to make life easier.

Many times I need to make a calculation like the example below.

I make a calculation and the answer of the calculation is necessary for the next calculation. Than I make the same calculation again in this answer is necessary for the next calculation etc.

In the example below an investment of 50000 euro is done.

And within 10 years the investment is payed off.

Each year 10% pay off.

The percentage interest is 3% (and doesnt change, in this case).

The calculation shows the total interest costs after 10 years.

But how can I (easy) calculate the total interest costs when the investment is payed off in for example 67 or 756 years? Or within 87667 years?

Forum: VisSim

VisSim on Core 2 Duo

localmandave — Wed, 06 May 2009 12:27:40 GMT

is there any issue with running VisSim 4.0 on a Core 2 Duo? we have a couple of engineers that use it here but the CPU usage only appears to go up to 50%. we have tried changing the affinity to use both cores but still it will at most only use 1 of them. is there a patch that could fix this issue?
Many thanks

Forum: VisSim

Coordinate between Vissim and Visual Basic

seer — Mon, 23 Mar 2009 16:47:29 GMT

Can anyone suggest good tutorial on how to coordinate between VISSIM and Visual Basic?

Thank You very much

Forum: VisSim

Please explain VisSim time step vs DspInterface block "sample rate"

Viswanathan — Wed, 04 Mar 2009 18:51:22 GMT

Hi

Can u please explain to me what is the relevance of simulation

frequency when I am running the code in a DSP. Does the simulation time step has any effect in DSP interface mode? Say I can set the PWM block base frequency at a value much higher than the simulation frequency. Is this fine? In this case the DSP has to actually take action at the PWM base frequency. If I have integrators in my system will they work only at simulation frequency? In that case the system response will be slow.

In case of ADC sampling rate above the simulation frequency, what is the effect?

Good Day

Viswanathan

Forum: VisSim

problem in viewing waveforms on plot

mitalip — Fri, 27 Feb 2009 06:22:44 GMT

Hi all,
i am using a trial version of vissim and using pmsm31_b3 diagram(space vector modulation). i actually connected a bldc motor to dsp and could run the motor in open loop but when i try to view any waveform for example current waveform or pwm waveforms in the plot they appear stretched out so i cant view them properly at a stretch in the plot.
i have selected realtime option in the simulation properties and i am also using monitor buffers to connect signals to the plot but still the problem persists.
i think i am not able to define the x -axis i.e the time axis properly.
if anyone has had a similar problem please help me.

Forum: VisSim

Relative path to bitmap in animate block sometimes failed

SteLoe — Thur, 26 Feb 2009 06:16:12 GMT

Hi,

I tried to use relative pathes in animate blocks, but very often the bitmap was not drawn (file not found?).

here my tree for example:

+- MainFile.vsm
|
+- _reUse
|- DotRedD.bmp

So, I place an animate block in MainFile.vsm (on toplevel) and set path to ".\_reUse\DotRedD.bmp".

But this failed. One times the bitmap was drawn, when I tried "..\_reUse\DotRedD.bmp" ( there was no file!?).

Does swap the current working directory sometimes? And how I do it right?

(I use VisSim V7.0A12)

Forum: VisSim

license error

nsheaves — Sun, 25 Jan 2009 21:14:46 GMT

Hello all, I'm new to VISSIM and am using it on a school computer for a class project. I've set up 3 simulations including one for base conditions, saved them all, and closed the program. Now when I try to open my simulations to edit them I receive the following error: "Maximum number of link types = 2 in this VISSIM license!"

I am now unable to open my simulations at all. Do any of you know a way past this error, or maybe exactly what it means? Thank you for your help with this!

Forum: VisSim

lineDraw Block - scrolling in display mode

ljmayes — Tue, 23 Dec 2008 13:46:26 GMT

I have been having problems with keeping lineDraw blocks where they ought to be on the screen.
What seems to happen is that when in display mode all the blocks move together except the lineDraw ones when the page is scrolled. They 'get stuck' and finish up in a totally new position - they all appear to usually move by the same amount. But it is frustrating having to keep moving them back to where they should be. I've also had them move off screen totally so they are then inaccessible.
It looks like a bug to me - any solution?

Forum: VisSim

Importing Simulink Model

jtliang — Thur, 18 Dec 2008 21:55:41 GMT

I tried to import a very basic Simulink model to test out the process. Basically, the simulink model was a step input to a transfer function block to a scope.

When I import using the Vissim Simulink import feature, I get this very cryptic message.

could not complete conversion of the SIMULINK model

Syntax problem in line: 5

{ expected

Also, the import log is below.

----------------Compiling...

Line 4 : warning: the common parser was loaded. Requested parser

I am not sure what is going on. Did I install Vissim incorrectly. I'm running Simulink version 6.4 (R2006a)

Forum: VisSim

My control algorithm runs OK in sim. mode on my PC, but runs very slowly, or not at all, on my target board

Rich — Thur, 13 Nov 2008 22:52:27 GMT

a.k.a., How fast can I run my controller on the DSP board?

Since this is becoming a common question from users of our VisSim/ECD product, we've decided to create a "post" from an engineer's response to a user on this subject...

... You have set the sample rate for your control algorithm at 1MHz. On a 150 MHz part like the F28335, that gives you only 150 CPU instructions per timer interrupt. Subtract 15 instructions for interrupt-handling overhead, divide the remainder by 4 and you get 35 blocks. At this sample rate, you have time to execute only 35 blocks maximum. Any more blocks, and the algorithm gets bogged down on the board.

In addition, your diagram has divides, sin, sqrt, & integrators. Each of these corresponds to about 30-35 instructions (not 4) because there is no hardware instruction for them. (Note that using the block instead of the block does not buy you any speed increase.)

My guess is that the fastest you can sample your algorithm in it's current state is about 100 kHz.

Do you really need a 1 MHz sample rate for your control?...

Hopefully, this will provide guidance in sample rate selection and trouble-shooting slow, or non-existent board performance.

Rich

Forum: VisSim

VisSim crash lost data

thermal — Wed, 22 Oct 2008 15:45:05 GMT

Dear All,

I was working today on my model, when VisSim application crashed.
I restarted VisSim and my diagram was empty.
Before the crash model consisted of multiple compound blocks, and after the crash all of it is gone.

The diagram's file size is about 20K, and if I look inside of the vsm file with text editor, I can see some information from the lost diagram and compaunt blocks in it.

Is there anyway to recover? Any help is appreciated, I did put lots of work in this diagram.

Thanks,

thermal

Forum: VisSim

Factorial function

BBpeter — Mon, 20 Oct 2008 22:20:52 GMT

Has vissim a factorial function?

Example
(n-1)!

If n=5, than vissim needs to calculate 4!
1*2*3*4=24

Greetings

Forum: VisSim

Goal seek function in Vissim?

BBpeter — Mon, 20 Oct 2008 22:09:03 GMT

In Exel I sometime use the function "Goal seek" .... does Vissim also has a function like that?

For example to find a solution for an equotion like;

y = (a*b) * (1-x)
If y = 85 and (a*b=100) what is x=?
Ans; x=0.15

Greetings

Forum: VisSim