Siemens SIMATIC ST-1500 Function Manual page 110

Edge selection
You can use this parameter to specify the edge of the digital input at which the configured
function is triggered.
The following options may be available depending on the function selected:
● At rising edge (default)
● At falling edge
● At rising and falling edge
The parameter can be set for the following functions of a digital input:
● Gate start (edge-triggered)
● Gate stop (edge-triggered)
● Synchronization
● Capture
Note
At rising and falling edge" can only be configured for the "Capture" function.
Behavior of counter value after Capture
You can configure the following characteristics for the counter after a capture event
(Page 30):
Reaction
Continue counting
(default)
Set to start value and continue
counting
Note
This parameter can be assigned only for the "Capture" function.
See also
Assignment of the feedback interface (Page 188)
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
Meaning
After saving the current counter value as Capture value, count-
ing is continued unchanged.
After saving the current counter value as Capture value, count-
ing is continued with the start value.
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