Clock/Clock-Pulse Generator - Siemens SIMATIC S5-95F Manual

STEP 5 Operations
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.
Signal states
1
0
1
0
T
STL
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
8-72
Timing Diagram
T
CSF
T 7
T
F 2.0
KT 10.1 TV
R
&
F 2.0
F 3.0
F 2.0 &
F 3.0
&
F 2.0
Q 1.0
F 2.0 &
Q 1.0
F 2.0
Q 1.0
Time
0
BI
DE
F 2.0
Q
Q 1.0
F 2.0
S
F 2.0
R Q
F 3.0
S
F 2.0
R Q
F 2.0
Circuit Diagram
G
F 2.0
F 3.0
Q 1.0
LAD
F 2.0
T 7
T 0
TV BI
KT 10.1
DE
R Q
Q 1.0
F 3.0
S
F 3.0
R Q
Q 1.0
F 3.0
S
Q 1.0
R Q
EWA 4NEB 812 6210-02
S5-95F
F 2.0
( )