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6.3 PLC Positioning
Prerequisites
Programming
December 2001
You can position the axes and also the main spindle directly through the PLC.
((See "Spindle" on page 6 – 180).)
The following constraints apply to a PLC positioning command:
n
It is possible in the Manual and Handwheel modes only while there is no
positioning movement.
n
Possible in the other modes of operation only with an M/S/T/Q strobe or if
no program is started.
n
If the NC is positioning an axis, you can position additional axes only if they
have already been defined as PLC axes. (See "PLC Axes" on page 6 – 28)
You start a PLC positioning movement with Module 9221, and you can
interrogate the status with Module 9222. After Module 9221 has been called,
markers M4120 to M4128 are set (depending on MP4020 bit 2). If you reset
these markers, positioning is canceled. This is necessary if you would like to
change a parameter, for example the feed rate, during positioning.
The following conditions apply to a PLC positioning command:
n
If more than one axis is moved simultaneously, then the axes will be
interpolated.
n
If you start another axis during a PLC positioning movement,
• then the first positioning command will be canceled and
• the resulting positioning movement will be executed in all axes.
n
Tool compensation is not included. Before a PLC positioning command you
must end any tool compensation.
n
A PLC positioning movement is not displayed in the test graphic.
The NC cancels a PLC positioning movement under the following conditions:
n
If in the Manual or Handwheel modes there is an NC STOP
n
If in the automatic operating modes there is an NC STOP and "internal stop"
n
An EMERGENCY STOP
n
An error message that results in a STOP
n
A reset of the Markers M4120 to M4128 (depending on MP4020 bit 2)
PLC Positioning
6 – 33
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