Siemens SIMATIC ST-1500 Function Manual page 147

Using the SSI_Absolute_Encoder technology object
4.4 Configuring SSI_Absolute_Encoder
Note
If you select the "None" or "0.05 ms" option, you have to use shielded cables for connection
of the digital inputs.
Note
You configure the input delay under "Behavior of DI0" for all digital inputs together. The input
delay is also displayed under "Behavior of DI1".
Edge selection
You can use this parameter to specify the edge of the digital input at which the configured
function is triggered for the "Capture" function.
You can select from the following options:
● At rising edge (default)
● At falling edge
● At rising and falling edge
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Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG