Siemens SIMATIC ST-1500 Function Manual page 114

Comparison value 1
Operating mode "Use count value as reference"
With the parameter assignment of the comparison value (Page 44), you specify the counter
value at which the digital output DQ1 switches as a result of the selected comparison event.
You must enter an integer (DINT) that is greater than comparison value 0 and less than or
equal to the high counting limit. The default setting is "10".
Operating mode "Use measured value as reference"
With the parameter assignment of the comparison value (Page 52), you specify the
measured value at which the digital output DQ1 switches as a result of the selected
comparison event.
You must enter a floating point number (REAL) that is greater than comparison value 0. The
maximum value is 7.922816 x 10
value depends on the measured variable.
Count direction
You use this parameter to specify the count direction for which the selected function is valid.
You can select from the following options:
Count direction
In both directions
(default)
Up
Down
The parameter can be configured for the following functions:
● At comparison value for a pulse duration
● After set command from CPU until comparison value
Pulse duration
By configuring the pulse duration for the function "At comparison value for a pulse duration",
you specify the number of milliseconds for which the respective digital output is active.
If you enter "0" and the counter value corresponds to the comparison value, the digital output
remains active until the next count pulse.
You can enter a value between 0.0 and 6553.5.
The default setting is "500.0", which is equivalent to a pulse duration of 0.5 s.
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
Using the High_Speed_Counter technology object
3.5 Configuring the High_Speed_Counter
. The default setting is "10.0". The unit of the comparison
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Meaning
The comparison and switching of the respective digital output take
place regardless of the count direction.
The comparison and switching of the respective digital output only
takes place when the counter counts up.
The comparison and switching of the respective digital output only
takes place when the counter counts down.
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