SIMPLORER User Manual V6.0 - FER-a

A
536 Appendix
Action Description Syntax in Value
DEL Sets a delay. The variable is set to false at the moment of var##time [s]
activation and set to true after the delay time.
delation##10m
DELRES Deletes a defined delay variable. del4
DIS The variable value (and moment) is displayed in the simu- Name.Qualifier
lator status window.
dc.n
TXT The given text string is displayed in the simulator status "Text String"
window.
"State waiting"
KEY Sets a mark in the state graph by pressing a key.
STOP Interrupts the simulation (can be continued). No Parameters
BREAK Finishes the simulation. No Parameters
SAVE Saves the active simulation status in a status file. No Parameters
Basic Rules for the Proper Choice of Time Step
Correct simulation processing and results depend on the proper choice of minimum and maximum
values for the integration step size. The smaller the maximum integration step size, the
more correct the results, but the longer the processing time.
This means that, when specifying these minimum and maximum time step values, you need
to compromise between accuracy and time. The basic rule of measurement “Not as precise as
possible, but as precise as required” is also valid for a simulation. The following guidelines
should help you prevent elementary mistakes in choosing the proper integration step width:
Model properties Recommended
What is the smallest time constant (τ min ) of the electric circuit (R*C or
L/R) or of the block diagram (PTn-elements)
What is the largest time constant (τ max ) of the electric circuit (R*C or
L/R) or of the block diagram (PTn-elements)
Which is the smallest cycle (T min) of oscillations that can be expected
(natural frequencies of the system or oscillating time functions)
Which is the largest cycle (T max ) of oscillations that can be expected
(natural frequencies of the system or oscillating time functions)
What is the smallest controller sampling (TS min )
What is the fastest transient occurrence (TU min) (edge changes of time
functions)
What is the time interval to be simulated (Tend)
τmin Hmin < ----------
10
τmax Hmax < ----------
10
Hmin Tmin < -----------
20
Hmax Tmax < -----------
20
Hmin TSmin < --------------
5
Hmax =
TS min
Hmin TUmin < ---------------
20
Hmax TEND
<
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50