Siemens SINUMERIK 840D sl Function Manual page 1562

Detailed description
2.4 Referencing with incremental measurement systems
Phase 2: Start
Phase 2 is automatically started when phase 1 has been completed without an alarm.
Initial situation:
The machine axis is positioned on the reference cam.
Zero mark search direction:
The zero mark is searched for in the parameterized direction and approached:
MD34050 $MA_REFP_SEARCH_MARKER_REVERSE (direction reversal on reference
cam)
Phase 2: Sequence
Synchronization in Phase 2 can occur in two ways:
• Synchronization with falling reference cam signal edge
• Synchronization with rising reference cam signal edge
The type of synchronization is determined with the machine data:
MD34050 $MA_REFP_SEARCH_MARKER_REVERSE (direction reversal on reference
cam)
Value
0
1
Note
If the actual velocity of the machine axis at appraoch of the reference cam has not yet
reached the target velocity of Phase 2 within the parameterized tolerence limits, Phase 1 will
be re-started:
MD35150 $MA_SPIND_DES_VELO_TOL (spindle speed tolerance)
This will be the case, for example, if the machine axes are positioned at the reference cam
when reference point approach starts.
Case 1: Synchronization with falling reference cam signal edge
During synchronization with falling reference cam signal edge, the machine axis accelerates
to the parameterized reference point creep velocity against the parameterized reference
point approach direction (traversing direction of Phase 1):
MD34040 $MA_REFP_VELO_SEARCH_MARKER (reference point creep velocity)
MD34010 $MA_REFP_CAM_DIR_IS_MINUS (Reference point approach in minus direction)
After the reference cam is exited (DB31, ... DBX12.7 = 0), the next encoder zero mark is
awaited.
16
Meaning
Synchronization with falling reference cam signal edge
Synchronization with rising reference cam signal edge
Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0