Determining Reference Points With Separate Switch - Siemens SIMATIC S5 Manual
Ip 267
stepper motor controller
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IP 267
6.4
Determining Reference Points with Separate Switch
A reference point is always determined in three approach sections (search for
reference point switch, overtravel reference point switch and approach reference
point switch slowly). Additional auxiliary approach jobs are required, for
example, if the reference switch is blocked by the drive.
At startup, the IP controls the drive forwards as far as the reference switch. In
doing so, the IP can approach one of the two limit switches and change direction
there. As soon as the reference point switch has been detected, the drive stops
with the normal deceleration ramp. If the deceleration distance is shorter than
the switching range of the reference point switch, the drive stops at the switch. In
this case, the next approach section could not be executed because the RPA
reference point bit is set and there is a "1" signal at the REF digital input.
In this case, an auxiliary approach section is required in order to leave the
reference point switch. The path of such auxiliary approach sections must be
calculated specifically for the plant in question. The auxiliary approach section
must also be executed with reset RPA reference point bit ( 6.3).
To make program execution easier, the "Backwards auxiliary approach section" is
executed in example program 4 even if the reference point switch has already
been overtravelled (BERO, etc.).
The reference point can also be approached backwards, in which case the
directions shown in the flowchart are reversed.
6-14
EWA 4NEB 812 6061-02a
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