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09.95 10 Axis and Spindle Installation
10.4.4 Reference point approach
10.4.4 Reference point approach
Corresponding data
• MD 240* (reference point value)
• MD 244* (reference point offset)
• MD 284* (reference point cutoff speed)
• MD 296* (reference point approach speed)
• MD 5008 bit 5 (setting up in jogging mode)
• MD 560* bit 6 (reference point approach with automatic direction recognition)
• MD 564* bit 0 (direction of reference point approach)
• "Ref. point reached" signal (DB 32 DL
K
bit 4)
• "Decelerate reference point approach" signal (DB 32 DL
K+1
bit 4)
Indirectly related:
• MD 5004 Bit 3 (NC START without reference point)
• MD 560* bit 4 (no start inhibit for reference point)
The control provides options for two different types of reference point approach, i.e. with and
without automatic direction finding. The relevant option is selected via MD 560* bit 6.
Note:
From SW 5, simultaneous referencing of several axes in one channel is possible.
10.4.4.1 Reference point approach without automatic direction
recognition
Prerequisites
• MD 560* bit 6 = 0
• Axis-specific feed enable set
• Collective feed enable set
• Reference point between reference point cam and limit switch.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 10–35
SINUMERIK 840C (IA)
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