Siemens SINUMERIK 840D sl Commissioning Manual page 160

NCK start-up
10.5 Parameterize axis data
Phase 1: Traversing to the reference cam
The following machine data and interface signals are relevant:
● MD34010 REFP_CAM_DIR_IS_MINUS (approach reference cam in negative direction)
● MD34020 REFP_VELO_SEARCH_CAM (reference cam approach velocity)
● MD34030 REFP_MAX_CAM_DIST (maximum distance to the reference cam)
● MD34092 REFP_CAM_SHIFT (electr. cam offset, incremental measuring systems with
● IS: DB21, ... DBX36.2 ("All axes with obligatory reference point are referenced")
● IS: DB31, ... DBX4.7/DBX4.6 ("Traversing keys plus/minus")
● IS: DB31, ... DBX12.7 ("Reference point approach delay")
● IS: DB31, ... DBX60.4, DBX60.5 ("Referenced/synchronized 1, 2")
Properties of phase 1:
● The feedrate override (feedrate switch) is active.
● The feed stop (channelspecific and axisspecific) is active.
● The machine axis can be stopped and restarted with NC-stop/NC-start.
● The machine axis traverses a distance specified in the following machine data from the
● The following interface signal is set to "0". The axis stops, and alarm 20000 "Reference
160
equidistant zero markers)
starting position in the direction of the reference cam, without reaching the reference
cam.
– MD34030 REFP_MAX_CAM_DIST (max. distance to reference cam)
cam not reached" is output.
– IS: DB31, ... DBX12.7 ("Reference point approach delay") = 0
WARNING
If the reference cam is not calibrated exactly, it is possible that a wrong zero mark is
evaluated after the reference cam has been left. As a result, the control system will
take a wrong machine zero.
Software limit switches, protection areas and work area limits will thus also be active
for the wrong positions. The difference is equivalent to one encoder revolution in
each case.
Danger for man and machine exists.
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
IBN CNC: NCK, PLC, drive