Siemens SIMATIC ET 200SP Manual page 68

Hysteresis
Fluctuations of the position value of an axis can cause unwanted switching on and off in the
cam control. Such unwanted switching states can be suppressed by configuring a hysteresis
(> 0).
The hysteresis is a position tolerance within which the position values may vary without
changing the switching state of the cam. Changes of direction detected within the hysteresis
are ignored.
Behavior when hysteresis is activated:
● The status of the hysteresis is indicated in the feedback interface (HYS).
● The configured hysteresis width is in effect for all cams.
● The hysteresis boundary points can be read out on the HYS-START and HYS-END
registers. They represent the hysteresis range spanned by the firmware.
● The hysteresis is always reevaluated by the firmware if no hysteresis range is currently
activated on the cam (HYS=0) at the time of a direction reversal.
● The hysteresis range extends in the positive and negative directions around the detected
direction reversal point. The hysteresis range thus extends over double the configured
hysteresis.
● The following applies within the hysteresis:
– The switching state of the cam is not changed.
● After the hysteresis range is exited, the output is set according to the cam settings.
①
②
③
Figure 6-7
Digital output module DQ 4x24VDC/2A HS (6ES7132-6BD20-0DA0)
Manual, 06/2018, A5E32855695-AC
Actual position
Effective position
Effective hysteresis
Hysteresis range - Detail
Cam control operating mode
6.2 Parameters/address space
67