User Manual 08/2003 Edition

02.99 05.03
How can an axis be
moved away from a
hardware switch?
Softwarelimit
switch
(SW limit switch)
P6, P7
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
If an axis is located at a hardware limit switch, then it can be moved
away again as follows:
1. Acknowledge the fault
2. Return the axis to the valid traversing range
In the jog mode or via velocity, move away in a direction opposite to
the approach direction
or
1. Withdraw the controller enable (control signal ON/OFF1)
2. Set the input terminal (function number 28/29) to 0
Note
If the hardware limit switch was passed, then it is only possible to
continue to traverse in the original direction, if after acknowledging the
fault, the axis is traversed in the opposite direction and again passes
over the hardware limit switch.
The software limit switch start (P6) and software limit switch end (P7)
can be correspondingly set to limit the operating range or to protect the
machine.
Notice
The software limit switches only become active if the following
conditions exist:
P6 < P7
pos mode: the axis is referenced (”reference point set” output
signal)
Only then is it certain that the axis will be immediately stopped if it
attempts to move out of the permissible range.
Note
The SW limit switch monitoring is dependent on the axis type as
follows:
For a linear axis or rotary axis with modulo correction, the following is
valid:
––> the software limit switches can be activated via P6