Aborting The Positioning Mode; Curved Acceleration Characteristic (Sw 4 And Higher) - Siemens SINUMERIK 840C Installation Instructions Manual

10.94

Aborting the positioning mode

The specified position is regarded as having been reached (or the distance as having been
traversed) when the spindle is within the position window. This is signalled to the PLC by
setting IS:SPINDLE POSITION REACHED.
The position is held under position control until the M19 function is aborted. The conditions for
aborting are as follows:
• IS ACKNOWLEDGE M19
• M3/M4 in part program or command channel
• Select C axis or synchronous mode
• Program end
• Reset
Abort behaviour can be influenced by MD bits (see section headed "Switching logic").
Setting IS:SPINDLE DISABLE or resetting IS:SERVO ENABLE interrupts the positioning mode.
If the signal is reset again or set again, positioning is continued, but with the following
exception:
• If the positioning mode was selected from the command channel, it will be interrupted if
IS:SERVO ENABLE is reset. An error message will be entered in the user interface.
Positioning will not be continued, however, if the signal is set again.

Curved acceleration characteristic (SW 4 and higher)

When induction motors are used (spindle operation), allowance must be made for their speed-
dependent acceleration capability in position-controlled operation:
TorqueM
Breakdown limit
Fig. 1 Torque characteristic of induction motor
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
Constant Constant
torque power
M = const M 1/n
n
n
Rated speed
6FC5197- AA50
12 Functional Descriptions
12.7.2 Description of the spindle modes
M 1/(n*n)
n n
k max
Speed n
12–49