Siemens SIMATIC ET 200AL System Manual page 400

Counting
4.1 Configuration method 2xCount
Behavior DI (direction input)
With this parameter you select whether a counting function is assigned to the digital input or
whether this functions like a standard digital input:
● Counting direction:
The digital input reverses the counting direction at Counter 0 or Counter 1, in order to
adjust it to the process. With signal "0" at the digital input, the counter forwards. With
signal "1" at the digital input, the counter counts backwards.
● Digital input without function:
No counting function is assigned to the digital input. It functions like a standard digital
input.
Parameter freely assignable Channels 8..15
Freely assignable channel
With this parameter, you set whether the channel is to be operated as an input or output.
Input delay channel
This parameter can be used to suppress signal interference. Changes to the signal are only
detected if they are constantly pending longer than the set input delay time.
Substitute value channel
With this parameter, you set substitute values for the digital outputs.
See also
Assignment of the feedback interface (Page 43)
40
Digital input/Digital output module DIQ 16x24VDC/0.5A 8xM12 (6ES7143-5AH00-0BA0)
Manual, 09/2017, A5E38688112-AB