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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Special functions
LOGO!Soft Comfort Online Help
262 Operating Instructions, 11/2017
Output Q is reset to 0 when Ta reaches the time T. Before the off delay time (T - T
!
) has
expired, you can output a prewarning that resets Q for the duration of the off prewarning time
T
!L
.
Ta is retriggered (optional) at the next high/low transition at input Trg and if Ta is expiring.
Scan cycle time
For information on how to determine the scan cycle time of a LOGO!, refer to the appendix of
the
LOGO! Manual
.
Special functions (Page 241)
5.3.1.11
Multiple function switch
Short description
Switch with two different functions:
● Pulse switch with off delay
● Switch (continuous light)
Connection
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 Ta and resets the output.
Parameter
T :
determines the off-delay time. The output is reset (1 to 0 transition) when the
time
T
expires.
T
L
:
determines the period during which the input must be set in order to enable
the permanent light function.
T
!
:
determines the on delay for the prewarning time.
T
!L
:
determines the length of the prewarning time period.
Retentivity on = the status is retentive in memory.
Output
Q
Output
Q
is set with a signal at input
Trg
, and it is reset again after a configured
time has expired and depending on the pulse width at input
Trg
, or it is reset with
another signal at input
Trg
.
Parameters T, T
L,
T
!
and T
!L
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:
● Analog comparator: Ax - Ay
● Analog threshold trigger: Ax
● Analog amplifier: Ax
… 262 …


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