Siemens LOGO!, Manual

Page: 182 / 534

LOGO! functions
4.4 Special functions list - SF
LOGO!
182
Manual, 04/2011, A5E03556174-01
4.4.10 Multiple function switch
Short description
Switch with two different functions:
●
Pulse switch with off-delay
● Switch (permanent lighting)
Symbol in LOGO! Wiring Description
Input Trg A signal at input Trg (Trigger) sets output Q
(permanent light) or resets Q with an off-delay. When
active, output Q can be reset with a signal at input
Trg.
Input R A signal at input R resets the current time T
a
and
resets the output.
Parameter T represents the off-delay time. The output is reset (1
to 0 transition) when time T expires.
T
L
represents the time during which the output must
be set to enable the permanent light function.
T
!
represents the on-delay for the prewarning time.
T
!L
represents the length of the prewarning time
period.
Retentivity:
/ = No retentivity
R = The status is retentive.
4
7UJ
5
3DU
Output Q A signal at Trg switches on output Q. Depending on
the length of the input at Trg, the output is switched
off again or switched on permanently, or it is reset
with a further signal at Trg.
Parameters T, T
L
,T
!
and T
!L
Note the defaults of the T parameters listed in topic Time response (Page 151).
The off-delay time T, the permanent light time T
L
, the on-delay prewarning time T
!
and the
prewarning time period T
!L
can be provided by the actual value of another already-
programmed function. You can use the actual values of the following functions:
●
Analog comparator (Page 218) (actual value Ax – Ay)
● Analog threshold trigger (Page 213) (actual value Ax)
● Analog amplifier (Page 226) (actual value Ax)
● Analog multiplexer (Page 248) (actual value AQ)
● Analog ramp (Page 251) (actual value AQ)
● Mathematic instruction (Page 265) (actual value AQ)
● PI controller (Page 256) (actual value AQ)
● Up/down counter (Page 201) (actual value Cnt)