Siemens SINUMERIK 840C Installation Instructions Manual page 360

04.96
1440*
Default value
100
This machine data is only used for the functionality "Electronic gearbox".
During LINK ACTIVE, the positional difference of the following axis compared with the leading
axes/spindles is monitored by the tolerance range "Synchronism fine" and "Synchronism
coarse". If the positional difference is greater than the tolerance range, then the corresponding
PLC interface signal SYNCHRONISM FINE OR SYNCHRONISM COARSE is set to 0 signal.
With these interface signals it is therefore possible to determine the positional synchronism of
the following axis.
More detailed information is given in the functional description of the electronic gearbox.
Note:
As from SW 4, for 8 parameter sets
1444*
Default value
400
This machine data is only used for the functionality "Electronic gearbox".
With LINK ACTIVE, the positional difference between the following axis and the leading axes
can be monitored with the machine data value "Emergency retraction threshold". The
emergency retraction monitoring must be enabled by setting an interface signal.
If the positional difference exceeds this threshold value, it can be output very quickly via a
digital hardware signal. An NC alarm ("Following axis emergency retraction") and the PLC
interface signal EMERGENCY RETRACTION ACTIVE are also set.
The MIXED I/O module must be in use in the servo area to achieve a very fast signal
"Emergency retraction" (in the positional control cycle).
More detailed information is given in the functional description of the electronic gearbox.
Note:
As from SW 4, for 8 parameter sets
1448*
Default value
90
Every axis is limited to a maximum acceleration and a maximum speed (NC MD 276*, 280*).
In addition, the following axis is in both cases checked against a warning threshold. The
warning threshold is defined in this machine data and applies to both the speed threshold and
the acceleration threshold. The warning threshold is entered as a percentage of the maximum
value in question.
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Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
Tolerance range synchronism coarse
Lower input limit Upper input limit
0 99999999 (SW 5.4
and higher)
Emergency retraction threshold
Lower input limit Upper input limit
0 99999999 (SW 5.4
and higher)
Warning threshold n
max
Lower input limit Upper input limit
0
6FC5197- AA50
6.7 Axis-specific MD 2 (axial data 2)
Units
16 000
1 unit (MS)
Units
16 000
1 unit (MS)
and a
max
Units
100
Active on
NC Stop
Active on
NC Stop
Active on
NC Stop
%
6–175