Program-Controlled Reference Point Approach - Siemens SINUMERIK 840C Installation Instructions Manual

07.97
2nd case: Axis is at the reference point cam
Speed
MD 284*
Axis is at reference point cam
d
10.4.4.3
Reference point approach can be executed in a part program with G74. When MD 1808*, bit 4,
is set, reference point approach to the coded reference marks is executed automatically. The
direction is defined in MD 564*, bit 0, and not with the direction keys.
Example:
AUTOMATIC or MDA mode
N10 G74
Note:
From SW 5, simultaneous referencing of up to 5 axes is possible.
Example:
N10 G74
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SINUMERIK 840C (IA)
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Reference point
Reference point pulse
When the Direction key is pressed, the PLC's "Deceleration" signal enables the NC to
establish with absolute accuracy that the axis is already located at the reference point
cam. The axis therefore accelerates in the reverse direction (MD 564* bit 0) to the speed
defined in MD 284* (refer to Section REFERENCE POINT APPROACH WITHOUT
AUTOMATIC DIRECTION RECOGNITION for a detailed description of the remaining
portion of the sequence).

Program-controlled reference point approach

L F
X
L F
X Y Z U V
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Reference point cam
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10 Axis and Spindle Installation
10.4.4 Reference point approach
Path
d
Traversing limit
10–39