User Manual 08/2003 Edition

02.99 04.01 08.03
Siemens AG 2003 All rights reserved
SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition
5 Description of the Functions
5.5 SIMODRIVE POSMO A functions
Set reference coordinate
The position of the last zero mark before the end of the second program
block is therefore set to the value in P5 (reference point coordinate).
Set simplified reference position (from SW 1.4)
The drive is automatically referenced when the above traversing program
is run if the following is specified in the second block:
P85:14 (signal position for block 14)
= set ”required reference point” coordinate
Set PSW.9 (set reference position) to ”1”
In this particular case, the last section in the example above is eliminated.
Note
If the direction of rotation is reversed in both traversing blocks, the
reference point approach is executed in the opposite direction.
In order to select the last zero mark at the reference cam as
reference point coordinate, the shutdown velocity should be
selected low enough, so that when braking after leaving the cam,
no other zero marks are passed.
Reference cam length
The cam length should be selected, so that the axis brakes from
the approach velocity to standstill while still at the cam.
Position of the reference cam
If the reference cam is not favorably mounted, when the traversing
program starts from the cam, a different reference point can be
obtained than when starting in front of the reference cam.
Remedy: The referencing program should be modified so
that the axis initially moves away from the cam.
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