Hello,

“But they need automatic adjustment on sensor without any human interaction.”

During an initialization run, it is necessary to move to a defined position that can be assumed as the reference position.

e.g.

It is possible to move against a fixed endstop, then trigger the homing or there is a homing switch.

With absolute encoder a referencing procedure is possible, too. After normal homing it is necessary to do absolutencoder adjustment Mode 7.

5.11.3 Active homing (S7-1500, S7-1500T)

When active homing starts, current traversing movements are aborted. In the case of active homing with absolute encoder, if a valid absolute value offset has not yet been saved (.StatusSensor[1..4].Adjusted = 0), an absolute value offset is retentively saved beyond the switching on/off of the controller. If an absolute value offset has already been saved in the CPU (.StatusSensor[1..4].Adjusted = 1), it is retained after an active homing. To update the absolute encoder offset, perform an absolute encoder adjustment to the current position after the active homing.

SW-Limitswitch:

9.1 Legend (S7-1500, S7-1500T)

Access to the tags is with ".". The placeholder represents the name of the technology object.

Restart: Changes to the start value in the load memory are made using the extended instruction "WRIT_DBL" (write to DB in load memory). Changes will not take effect until after restart of the technology object.

9.3.17 "PositionLimits_SW" tag (positioning axis) (S7-1500, S7-1500T) The tag structure ".PositionLimits_SW." contains the configuration of position monitoring with software limit switches. Software limit switches are used to limit the operating range of a positioning axis.

e.g.

<TO>.PositionLimits_SW.Active       BOOL -        DIR                                         FALSE Monitoring deactivated TRUE Monitoring enabled

https://support.industry.siemens.com/cs/ww/en/view/109974348