LOGO! manual
EWA 4NEB 712 6006-02
32
3.5.9 Clock pulse generator
En
TQ
The symbol for a clock pulse gen-
erator in LOGO!
A clock pulse generator in a cir-
cuit diagram:
En input You switch the clock pulse generator on and off via the En in-
put (enable).
T parameter T is the time for which the output is switched on or off.
Timing diagram
En
Q
T T
T T
You use the T parameter to specify how long the on and off times are to
last. You use the En (enable) input to switch the clock pulse generator on.
The clock pulse generator sets the output to 1 for the time T, then to 0 for
the time T, and so on until the En input is at 0.
Note on the T parameter
Always specify a time for T 0.10 s. For T = 0.05 s and T = 0.00 s, the
time T is not defined.
Note on the relay outputs Q1 to Q4:
Relay outputs that switch under load get worn a little with each switching
operation. To find out how many switching operations a LOGO! output
can execute, refer to the chapter entitled ”Technical data” (see chapter 12).
Programming LOGO!
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