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Reference end
position
Activate the
software limit
switches before
traversing the
reference marks
800
To prevent the axes from violating their traverse limits when traversing the
reference marks, each axis requires a trip dog (at the reference end position).
The trip dogs must be installed by the machine tool builder at the ends of the
traverse range. The switch signals from the trip dogs are sent to free PLC
inputs. The PLC program must gate these PLC inputs with W1054/D1160 for
"reference end position."
The axis will only automatically be positioned to the software limit switch if
It is beyond the positive software limit switch and is moving in the positive
direction to the positive trip dog.
It is beyond the negative software limit switch and is moving in the negative
direction to the negative trip dog.
The control saves the last axis positions to be traversed before switch-off.
These positions allow you to check the traverse ranges of the axes when
traversing the reference marks. This can be activated for a specific axis in
MP1352.x and is switched on/off with the MONITOR SW LIMIT soft key. This
soft key is available after the control has been switched on in the "reference
mark traverse" operating mode.
Danger
When approaching the reference marks again (e.g. after switching the
axis), this monitoring function is not active.
If fatal error messages occur, the position at shutdown may not be
exactly identical to the position at switch-on.
Please inform your customers for which axes you have enabled the
activation of the software limit switches in MP1352, and for which axes
you have not enabled it. The MONITOR SW LIMIT soft key, specifically
for switching monitoring off, is available if MP1352 is set for at least one
axis. The user, however, is not informed for which axes the software
limit-switch monitoring function before reference-mark traverse is active.
HEIDENHAIN Technical Manual iTNC 530 HSCI
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