Siemens SIMATIC S7 System Manual page 605

Risks with changes to filter time for digital input channel
If the filter time for a digital input channel is changed from a previous setting, a new "0"
level input value may need to be presented for up to 12.8 ms accumulated duration before
the filter becomes fully responsive to new inputs. During this time, short "0" pulse events of
duration less than 12.8 ms may not be detected or counted.
This changing of filter times can result in unexpected machine or process operation, which
may cause death or serious injury to personnel, and/or damage to equipment.
To ensure that a new filter time goes immediately into effect, cycle the power of the CPU.
Table 12- 4 Motion control CPU hard-coded outputs
Signal Description
P0 P0 and P1 are pulse outputs that control the movement and direction of movement of the motor.
P1
DIS DIS is an output used to disable or enable the motor driver/amplifier.
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
WARNING
Open loop motion control
12.3 Features of motion control
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