Setting Warning And Trip Limits - Siemens SINUMERIK 840D sl Function Manual

If Case A applies, the synchronization process can be started immediately (see "start
synchronization process" step). If Case B applies, the offset "diff" must be calculated and taken
into account:
● Measuring of diff
● By using two appropriate, right-angled reference points R' and R" in the machine bed (right
in picture), the difference in position in JOG can be traversed. The diff offset can then be
read as the difference in the position display. The diff offset must be entered in the machine
data of axis 3 (synchronized axis):
MD34100 $MA_REFP_SET_POS
Continue with Step 1 (see above).
● Start gantry synchronization. PLC sets:
DB31, ... DBX29.4 = 1 (start synchronization of gantry)
3.8.4

Setting warning and trip limits

If the gantry grouping is set and synchronized, the following machine data must then be set:
MD37110 $MA_GANTRY_POS_TOL_WARNING (gantry warning limit)
MD37120 $MA_GANTRY_POS_TOL_ERROR (gantry trip limit)
Proceed as follows
● Set the machine data for all axes with a large value to begin with:
MD37120 $MA_GANTRY_POS_TOL_ERROR (gantry trip limit)
● Set a very small value in the machine data:
MD37110 $MA_GANTRY_POS_TOL_WARNING (gantry warning limit)
When you put a heavy, dynamic strain on the axes, the self-canceling alarm "10652 channel
%1 axis %2 gantry warning limit exceeded" will be output repeatedly.
● Now increase the following machine data:
MD37110 $MA_GANTRY_POS_TOL_WARNING (gantry warning limit)
Repeat this until the alarm no longer appears. The interface indicates the status:
DB31, ... DBB102.2 = 0 (trip limit not exceeded)
DB31, ... DBB102.3 = 0 (warning limit not exceeded)
DB31, ... DBB102.4 = 0 (synchronization process not ready to start)
DB31, ... DBB102.5 = 1 (gantry grouping is synchronous)
DB31, ... DBB102.6 = 1 (leading axis LA)
DB31, ... DBB102.7 = 1 (gantry axis)
If the monitoring still only triggers very sporadically, it is possible to program a edge memory
bit in the PLC user program.
● Enter the value calculated for the warning limit + a small safety provision in the following
machine data:
MD37120 $MA_GANTRY_POS_TOL_ERROR (gantry trip limit)
Error limit values
Values are entered in the following machine data:
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
G1: Gantry axes
3.8 Examples
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