12.93 12 Functional Descriptions
12.18.13 Start-up
K
v
1
=33.33 s
-1
V
1
=0.66 T
SYM
1
=5 ms
1-0.66
T
SUBS
1
= –––––––+5 ms=15 ms
33.33
K
v
2
=33.33s
-1
V
2
=0.66 T
SYM
2
=5 ms
1-0.66
T
SUBS
2
= –––––––+5 ms=15 ms
33.33
K
v
2
=25.00s
-1
V
3
=0.66 T
SYM
3
=7 ms
1-0.66
T
SUBS
3
= –––––––+7 ms=20.2 ms
25
T
X
1
=20.2 - 15.0=5.2 ms
T
X
2
=20.2 - 15.0=5.2 ms
T
X
3
=20.2 - 20.2=0.0 ms
Setting the GI machine data and the necessary PLC signals
In order to be able to configure a gearbox link via the input display or the NC part program and
to enter the synchronous positions and link factors, you must set the following NC MD bits for
the following drive to "1":
• NC MD 1844*/525* bit0 Axis/spindle may be FD/FS
• NC MD 1844*/525* bit1 Reconfiguration permissible
• NC MD 1844*/525* bit2 Switchover of link factor permissible
• NC MD 1844*/525* bit3 Overwriting of positions permissible
For inputs via the input display, you must set NC MD 5006, bit 4 to "0".
As soon as you wish to traverse the following drive with overlay (e.g. for on-the-fly
synchronization), the PLC signal ENABLE FOLLOWING AXIS/SPINDLE OVERLAY (DB29/31)
must be set to "1".
After start-up, the bits must be set in accordance with the machine
philosophy of the manufacturer.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50
12–161
SINUMERIK 840C (IA)