HEIDENHAIN TNC 150 B Mounting Instructions page 35

Function
Axis sequence for
approaching reference points
Parameter Possible
No.
entry svalues
59
0 h x Y z IV
=
1 * x Y IV z
=
2 n x z Y IV
=
3 2 x z IV Y
4 2 x IV Y z
5 c x IV z Y
6
f
Y x z IV
7 ,+ Y x IV z
=
8
!?
Y z x IV
9 A Y z IV x
=
IO 2 Y IV x z
11 e Y iv z x
12 g z x Y IV
13 2 z x IV Y
14 4 z Y x IV
15 p z Y IV x
16 e Z IV X Y
17 c z IV Y x
18 4 IV X Y Z
19 c IV x z Y
20 J? IV Y x z
21 c IV Y z x
22 G IV z x Y
23 c IV Z Y X
With parameter 59 the axis sequence for reference point approach is determined.
Care should be taken that the ttiol axis is traversed away from the workpiece first.
0 A
zz
plus-direction
1
h =
minus-direction
Selected
entry values
Traversing direction for
reference point approach X 16
Y 17
Z
18
IV 19
With these parameters, the traversing direction when approaching the reference points is determined in relation-
ship to the "reference end position" cam. Depending on the location of the reference point on the scale, the
cam for the "reference end position" can be fixed at the end of the axis in the plus or minus direction in
relationship to the counting directions and in accordance with the "right-hand rule".
Special sequence for reference 69
0 2
off
point approach
1 h on
=
The special sequence for reference point approach is only required when several reference points are located
within the machine traverses (e.g. when using rotary encoders as transducers) and no additional cam switches
for "reference pulse inhibit" are being used (inputs J6 contacts 1,2,3,4).
If machine parameter 69 is programmed with "1" the special sequence is active as follows:
Axes which are standing within the vicinity of the reference end position are backed-off from the reference end
position cam before approaching the reference points. The appropriate axes are designated by the inverted
display "reference point X/Y/Z/IV approach". Finally, the reference point approach procedure is carried out
in the normal manner and the first reference point after the closing of the switch "reference end position" is
evaluated.
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