Technology instructions
10.3 Motion control
S7-1200 Programmable controller
714 System Manual, V4.2, 09/2016, A5E02486680-AK
When the hardware limit switches are approached, the axis brakes to a standstill at the
configured emergency deceleration. The specified emergency deceleration must be
sufficient to reliably stop the axis before the mechanical stop. The following diagram
presents the behavior of the axis after it approaches the hardware limit switches.
The axis brakes to a standstill at the configured emergency deceleration.
Range in which the hardware limit switches signal the stats "approached".
Lower hardware limit switch
Upper hardware limit switch
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 needs to be presented for up to 20.0 ms accumulated duration before the
filter becomes fully responsive to new inputs. During this time, short "0" pulse events of
duration less than 20.0 ms cannot be detected or counted.
This changing of filter times can result in unexpected machine or process operation, which
can cause death or serious injury to personnel, and/or damage to equipment.
To ensure that a new filter time goes immediately into effect, a power cycle of the CPU
must be applied.
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