Detailed Description
2.6 Referencing with absolute value encoders
Reference Point Approach (R1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-35
Part program
The part program for automatic adjustment of absolute encoders with probe must perform
the points listed below for each axis in the order indicated:
1. Approach the adjustment position of machine axis, which is detected from the probe
response.
The position must be approached several times from the same direction, but at a velocity
which is gradually reduced on each approach, to ensure that the measured value
obtained is as accurate as possible. The measured value is stored in system variable
$AA_IM.
2. Calculate and write the reference point offset to machine data:
MD34090 $MA_REFP_MOVE_DIST_CORR = MD34100 $MA_REFP_SET_POS –
$AA_IM
3. Set the absolute encoder status to "Encoder is adjusted":
MD34210 $MA_ ENC_REFP_STATE = 2
Sequence
Proceed as follows for automatic adjustment with probe:
1. Enable part program start even for non-referenced machine axes:
MD20700 $MC_REFP_NC_START_LOCK = 0
2. Enter the machine axis position relative to machine zero when probe is switched as the
reference point value for all relevant machine axes:
MD34100 $MA_REFP_SET_POS = reference point value
3. Initiate NC-RESET to transfer the entered machine data values.
4. Start part program.
5. Disable part program start again for non-referenced machine axes:
MD20700 $MC_REFP_NC_START_LOCK = 1
6. Initiate POWER ON - Reset so that the reference point offset written by the part program
is permanently active:
MD34090 $MA_REFP_MOVE_DIST_CORR (reference point offset)
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