STEP 5 Operations
S5-95F
8.5.3
Clock/Clock-Pulse Generator
This subsection describes how to program a clock-pulse generator.
Example:
A clock-pulse generator can be implemented using a self-clocking timer that is followed
in the circuit by a binary scaler. Flag F 2.0 restarts timer T 7 each time it runs down,
i.e., flag F 2.0 is “1” for one cycle each time the timer runs down. The pulses of flag
F 2.0 applied to the binary scaler result in a pulse train with pulse duty factor 1:1 at
output Q 1.0. The period of this pulse train is twice as long as the time value of the
self-clocking timer.
Circuit Diagram
Timing Diagram
T
F 2.0
Q 1.0
T
Time
Signal states
1
0
1
0
G
F 2.0
F 3.0
Q 1.0
Q 1.0
F 2.0
Q 1.0
F 2.0
F 3.0
F 2.0
F 3.0
F 2.0
KT 10.1
F 2.0
T 7
T 7
LAD
STL
CSF
F 3.0
F 2.0
F 3.0
Q 1.0
F 2.0
KT 10.1
F 2.0
T
0
TV
BI
DE
R
Q
S
R
Q
S
R
Q
&
&
&
&
F 2.0
Q 1.0
F 2.0
Q 1.0
F 2.0
F 3.0
F 3.0
Q 1.0
F 2.0
( )
T
0
TV
BI
DE
R
Q
S
R
Q
S
R
Q
AN
F
2.0
L
KT
010.1
SD
T
7
NOP
0
NOP
0
NOP
0
A
T
7
=
F
2.0
***
A
F
2.0
AN
F
3.0
S
Q
1.0
A
F
2.0
A
F
3.0
R
Q
1.0
NOP
0
***
AN
F
2.0
A
Q
1.0
S
F
3.0
AN
F
2.0
AN
Q
1.0
R
F
3.0
NOP
0
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8-72
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