6 – 106 HEIDENHAIN Technical Manual TNC 426, TNC 430
Position encoder
with one reference
mark
Function when MP1350.x = 1
Press the external START key
Trip dog
"Reference end position"
closed?
Machine moves
in direction from
MP1320
Machine moves in inverted
traverse direction from
MP1320
Reference mark is passed over
Is the machine
outside the software
limit switch range?
Machine moves to
software limit switch
Machine stops
No Yes
Ye s
No
Ye s
No
Trip dog
"Reference end position" is
closed before two successive
reference marks are
traversed
Reference marks
Closed
Open
Trip dog
"Reference end position"
Traverse direction MP1320
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