Siemens SIMATIC S5 Manual page 163

IP 265
To acquaint you with the COM 265 simulator, the example below deals with the simplest form of
simulation. In subsequent sections, you will find detailed information on all of the many possible
simulator settings. You yourself must decide which simulator settings are best for your program test.
Example: Simulating a Reset Dominant Flipflop
User actions
In order to simulate a flipflop, you must carry out two
activities. You must:
• Specify the signal states of the Set input and the
Reset input
• Clock the Set/Reset operation manually
a) Setting an RS flipflop
You can change the signal state at Set input I 0.0
from "0" to "1" by entering <0>+<0>
Press the space bar to generate an IP 265 clock
pulse. The signal state change is injected into the
circuit.
Press the space bar to generate a second IP 265
clock pulse.
The RS flipflop has been set.
b) Resetting a Set input
You can change the signal state at Set input I 0.0
from "1" to "0" by entering <0>+<0>
Generate two IP 265 clock pulses by pressing the
space bar twice in succession.
The RS flipflop remains set.
c) Resetting an RS flipflop
You can change the signal state at Reset input I 0.1
from "0" to "1" by entering <0>+<1>
Generate two IP 265 clock pulses by pressing the
space bar twice in succession.
The RS flipflop is reset.
You can reinstate the initial situation by changing the signal state at Reset input I 0.1 from "1" to "0" and
pressing the space bar.
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Table 10-2
EWA 4NEB 812 6130-02a
Table 10-1. Simulating a Reset Dominant Flipflop
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Testing and Simulation with COM 265
Display
Initial situation
1
I 0.0
S
I 0.1
R Q
0
RS flipflop set
1
I 0.0
S
I 0.1
R Q
1
Latching RS flipflop
1
I 0.0
S
I 0.1
R Q
1
RS flipflop reset
1
I 0.0
S
I 0.1
R Q
0
Q 0.5
Q 0.5
Q 0.5
Q 0.5
10-5