Siemens SINUMERIK 808D Function Manual

Function Manual
68 01/2017
8.5.3
Parameter setting
Movement in the opposite direction
The response while traversing in the opposite direction, i.e., against the direction of the approaching fixed point depends on
the setting of Bit 2 in the machine data:
MD10735 JOG_MODE_MASK (settings for "JOG" mode)
Bit
Value
Description
2
0
Travel in the opposite direction is not possible (default setting).
1
Movement in the opposite direction is possible.
Fixed point positions
A maximum of 4 fixed point positions can be defined for each axis via the following machine data:
MD30600 FIX_POINT_POS[n]
Number of valid fixed point positions
The number of valid fixed point positions of an axis is defined via the machine data:
MD30610 NUM_FIX_POINT_POS
Note
"Approaching fixed point with G75" constitutes an exception here. In this case, it is also possible to approach two f
ixed-point
positions with one setting (MD30610
= 0).
8.5.4
Programming
System variables
The following system variables that can be read in the part program and in the synchronous actions for the "Approach fixed
point" function are available.
System variable
Description
$AA_FIX_POINT_SELECTED [<Axis>]
Number of fixed point to be approached
$AA_FIX_POINT_ACT [<Axis>] Number of the fixed point on which the axis is currently
located
8.5.5
Supplementary Conditions
Axis is indexing axis
The axis is not traversed and an alarm is output if the axis to be traversed is an indexing axis and the fixed point position to
be approached does not match an indexing position.
Frames active
All active frames are ignored. Traversing is performed in the machine coordinate system.
Offset values active
Active compensation values (external work offset, synchronized action offset $AA_OFF, online tool offset) are also applied.
The fixed point is a position in the machine coordinates system.
An alarm is signaled if an offset movement (external work offset, synchronized action offset $AA_OFF, online tool offset) is
made during a fixed-point approach in JOG. The position of the fixed point to be approached in the machine coordinates
system is not reached; instead a position that would have been reached without active offset movement is reached. The
NC/PLC interface signal "JOG - Approaching fixed point reached" (DB390x.DBX1001.3-5) is not signaled.

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English