Now we will change the processing time of the SingleProc Testing from the default time of 1 minute to a mathematical distribution - the Normal distribution. This way the processing time for each part will be based on a random number which follows the Normal distribution.
Open the dialog window of the SingleProc Testing.
Select Normal from the drop-down list Processing time.
Change the time to 1,0:55,0:05,0:01,1:30.
Above the edit text field, Plant Simulation shows the parameters which are required for this distribution. The first parameter Stream refers to the sequence of random numbers (the Random Number Stream). Usually we use a different sequence of random numbers for each parameter which is determined by random behavior to make sure that the random behavior of those parameters is completely independent.
In Plant Simulation, we separate seconds from minutes by a colon (":") for time values. So the meaning of "1:30" is 1 minute and 30 seconds.
The processing time for Testing now follows a Normal distribution with an average value of 55 seconds and a standard deviation of 5 seconds.
Now select a distribution in the Source, rather than a constant interval time.
Open the dialog window of the Source.
Change the Interval to Negexp.
Type in a distribution time of 2,1:00.
Run the model once again, notice that the parts may change their color to yellow. This shows that the parts were blocked - they could not move to the next object because it was still occupied. We therefore need to create a way to solve this issue.
