Detailed Description
2.14 Reference point approach (R1)
NC/PLC Interface Signals (Z1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-117
2.14.3 Signals to axis/spindle (DB31, ...)
DB31, ...
DBX2.4 - DBX2.7
Reference point value 1 to 4
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change
0 → 1
When the reference cam is reached, the NCK is signaled which coded reference cam is actuated.
The interface signal:
DB31, ... DBX2.4 - DBX2.7 (reference point values 1 to 4)
must remain set until the reference point is reached,
or until a new coded reference cam is actuated.
If the machine axis has reached the reference point (axis stationary) then using the reference point
value pre-selected using
IS "reference point values 1 to 4" from the machine data:
MD34100 $MA_REFP_SET_POS (reference point value)
is transferred into the control as the new reference position.
Signal state 0 or
edge change
1 → 0
No effect.
Signal irrelevant
for ...
Linear measurement systems with distance-coded reference marks
Application
example(s)
On a machine tool with large traversing distances, four coded reference cams can be distributed
over the entire distance traveled by the axis, four different reference points approached and the
time required to reach a valid referenced point reduced.
Special cases,
errors, ......
If the machine axis has arrived at the reference point and none of the four "reference point value 1
to 4" interface signals has been set, the value of the reference point is automatically set to 1.
Corresponding to .... MD34100 $MA_REFP_SET_POS (reference point value)
DB31, ...
DBX12.7
Reference point approach delay
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change
0 → 1
The machine axis is positioned on the reference cam.
Signal state 0 or
edge change
1 → 0
The machine axis is positioned in front of the reference cam. An appropriately long reference cam
(up to the end of the traversing range) should be used to prevent the machine axis from being
located behind (after) the referencing cam.
Corresponding to .... DB31, ... DBX2.4 - DBX2.7 (reference point values 1 to 4)
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