Calculation Rule; Default On/Off Parameters - Siemens Logo! Manual

Calculation rule

S
If the On threshold
Q = 1, if Cnt
Q = 0, if Cnt < Off.
S
If the On threshold < Off threshold, then Q = 1,
if On

Default on/off parameters

The default limits for the on and/or off parameters can be
derived from another, already programmed function. You
can use the actual values of the following functions:
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Analog comparator (actual value Ax – Ay,
see Chapter 4.4.18)
S
Analog threshold trigger (actual value Ax, see Chapter
4.4.16)
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Analog amplifier (actual value Ax, see Chapter 4.4.20)
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Analog multiplexer (actual value AQ, see Chapter
4.4.26)
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Analog ramp (actual value AQ, see Chapter 4.4.27)
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PI controller (actual value AQ, see Chapter 4.4.28)
and
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Up/down counter (actual value Cnt).
Select the required function by means of the block number.
For information on parameter defaults,
refer to Chapter 4.4.1.
Note
The system scans the counter limit value cyclically.
Thus, if the pulse frequency at the fast inputs I5/I6 is faster
than the cycle time, the special function might not switch
until after the specified limit value is exceeded.
Example: Up to 100 pulses per cycle can be counted; 900
pulses have been counted so far. On = 950; Off = 10000.
The output is set in the next cycle, after the value has
reached 1000. (The output would not be set at all if the
value Off = 980.)
LOGO! Manual
A5E00380835-01

On

Cnt < Off.

Off threshold, then:
LOGO! functions
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