Siemens SINUMERIK 840C - Manual (Page 317)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 07.97
6.6.2 Spindle-specific MD bits (spindle bits)
7 6 5 4 3 2 1 0
Bit No.
NC MD
526*
Synchroni-
zation of
tooth pitch
(as from
SW 6)
Block
change
when syn-
chronization
achieved
Suppres-
sion of
accel. limit.
Block
change with
synchro-
nism fine
Reserved Reserved
Bit 7=1 The synchronization path of following spindles is limited to 1
revolution/denominator of the GI link ratio to the leading spindle. The
synchronous position is then determined by the setting in MD 531*, bit 4 or
reached by deceleration.
Bit 7=0 The synchronous position of following spindles is limited to 1 revolution.
Above half the maximum speed, the synchronous position is reached by
deceleration, below half the maximum speed along the shortest path.
Note:
If bit 4 has been set, synchronization must never be performed while the tool and wheel are in
use.
Bit 5 Block change after synchronization (with on-the-fly synchronization)
Bit 5=1 On-the-fly synchronization with G403: Block change after the synchronous
position has been reached (see also PLC signal, "Synchronous position
reached").
Bit 5=0 Block change immediately, i.e., as soon as synchronization is triggered.
Synchronization does not start if PLC signal "Disable LINK ON" is active.
Bit 3 "Suppression of acceleration limitation"
Bit 3=1 "Acceleration limitation not active"
With LINK ACTIVE, the acceleration of the following spindle is not limited by
the control but is output directly, as determined by leading spindle. If MD
value 2522*-2529* is exceeded, no alarm is triggered.
Bit 3=0 "Acceleration limitation active"
With LINK ACTIVE, the acceleration of the following spindle is limited to the
acceleration value set in the machine data (MD 2522*-2529*).
Note:
The limitation remains active until the synchronous speed or zero speed is
reached:
• On runup after switching on the link
• When switching from speed ratio
• When stopping the spindle by switching off the link
Bit 2 ”Block change with synchronism fine”
Bit 2=1 After an overlaid movement, block change is triggered in the NC. As soon
as the following spindle has reached "Synchronism fine" and all the partial
setpoints of the block have been output.
Bit 2=0 Block change is triggered when the synchronism speed has been reached
and all the partial setpoints of the block have been output.
6–132 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)