Siemens LOGO! - Page 149

141
LOGO! Manual
A5E00380835-01
 Analog amplifier (actual value Ax, see Chapter 4.4.20)
 Analog multiplexer (actual value AQ, see Chapter
4.4.26)
 Analog ramp (actual value AQ, see Chapter 4.4.27)
 PI controller (actual value AQ, see Chapter 4.4.28)
and
 Up/down counter (actual value Cnt,
see Chapter 4.4.13).
Select the required function by means of the block number.
The timebase is configurable. For information on valid time-
base ranges and parameter preset, refer to Chapter 4.4.1.
Timing diagram
Trg
T
TT
a
expires
Q
R
The bold section of
the timing diagram
also appears in the
off-delay symbol.
Functional description
Output Q is set to hi immediately when the input Trg
changes to hi.
The actual time T
a
in LOGO! is retriggered at the 1 to 0
transition of Trg. The output remains set. Output Q is reset
to 0 with off-delay when T
a
reaches the value configured at
T (T
a
=T).
The time T
a
is retriggered with a one-shot at input Trg.
You can set input R (Reset) to reset the time T
a
and the
output before T
a
has expired.
If retentivity is not set, output Q and the expired time are
reset after a power failure.
LOGO! functions