Siemens SINUMERIK 840C - Manual (Page 360)

04.96 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.7 Axis-specific MD 2 (axial data 2)
Tolerance range synchronism coarse 1440*
Default value Lower input limit Upper input limit Units
100 0
16 000
99999999 (SW 5.4
and higher)
1 unit (MS)
Active on
NC Stop
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
Emergency retraction threshold 1444*
Default value Lower input limit Upper input limit Units
400 0
16 000
99999999 (SW 5.4
and higher)
1 unit (MS)
Active on
NC Stop
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
Warning threshold n
max
and a
max
1448*
Default value Lower input limit Upper input limit Units
90 0 100 %
Active on
NC Stop
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.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–175
SINUMERIK 840C (IA)