Maximum Traversing Range - Siemens SINUMERIK 840C Installation Instructions Manual

10 Axis and Spindle Installation 06.93

10.2.8 Maximum traversing range

10.2.8 Maximum traversing range
The set combination of input resolution and axis-specific position control resolution determines
the maximum traversing range (separate for each axis). This maximum traversing range
applies to the maximum path between the two axis limitations as well as to the maximum
programmable value for axis positions, interpolation parameters, chamfer, radius etc.
Only values which are within the range limits are permitted for the working area limitation
(setting data: 300*, 304*). If an illegal value is entered for the working area limitation, alarm
3084 "Wrong working area limitation" is issued. In addition, the maximum permissible
maximum or minimum value is entered by the control into the setting data "Working area
limitation".
In addition to the working area limitation, the control also checks that the software limit switch
(machine data: 224*, 228*, 232*, 236*) and the prelimit switch (machine data: 1100*) are valid.
Alarm 87 "Wrong software end switch" is output if the values are illegal. This check is carried
out independently of machine data 556* bit 5 "Working area limitation, software limit switch
active".
To avoid exceeding the working area, the absolute position is compared with the range limits.
This comparison only has to be carried out if the software limit switch/working area limitation
are not active, because when they are, the traversing range is not exceeded. This check is not
carried out on rotary axes.
If the range limits are exceeded, alarm 1204* "Traversing range limit" (reset alarm) is issued.
The alarm is output if the traversing range is exceeded in a positive or a negative direction.
The same procedures are introduced when the working area limitation is violated, i.e. retreat
from the area limits is only possible in the opposite direction. The alarm is only issued once
the traversing area has been left. The axes concerned are braked abruptly (no deceleration
ramp).
In the case of endlessly rotating rotary axes the traversing ranges shown below can be
exceeded if the permitted combination of input and position control resolution has been
configured. If illegal input resolution and position control resolutions are entered, incorrect
operation results (when the traversing range is overshot).
10–12
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SINUMERIK 840C (IA)