6 – 104 HEIDENHAIN Technical Manual TNC 426, TNC 430
Position encoder
with distance-
coded reference
marks
Function when MP1350.x = 3
Reference marks
closed
open
"Reference end
postion" trip dog
Traverse direction MP1320
Press the external START key
Trip dog
"Reference end position"
closed?
Machine traverse
in direction from
MP1320
Machine traverses in
inverted direction from
MP1320
Two successive reference marks are traversed
Is the machine
outside the software limit
switch range?
Machine moves to
software limit switch
Machine stops
No Yes
Yes
No
Yes
No
Trip dog
"Reference end position"
is closed before two consecutive
reference marks are
passed over
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