Siemens SINUMERIK 840C - Manual (Page 378)

07.97 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.7.1 Axis-specific MD bits 2 (axial bits 2)
Bit 3 "Suppression of acceleration limitation"
Bit 3=1 "Acceleration limitation not active"
With LINK ACTIVE, the acceleration of the following axis is not limited by
the control but is output directly, as determined by leading spindle. If MD
value 1768* is exceeded, no alarm is triggered.
Bit 3=0 "Acceleration limitation active"
With LINK ACTIVE, the acceleration of the following axis is limited to the
acceleration value set in the machine data (MD 1768*).
Note:
The limitation remains active until the synchronous speed or zero speed is
reached:
• On runup after switching on the link
• When switching from link factor
• 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 axis 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 partial setpoints of the block have been output.
Block change with synchronism fine. Motor operating without disturbance. Behaviour corresponds to parallel
model.
Partial setpoint
Partial actual value
Synchronism fine window
Block change on 1 signal
Block change on 0 signal
T
delay
t
V
FA
T
delay
delay (derived from the time
constant of the parallel model)
Following axis/spindle-specific machine data bits
7 6 5 4 3 2 1 0
Bit No.
NC MD
1852*
Include tool
length
comp.
Include
program-
med ZO
G58...G59
Include
external ZO
Include
settable ZO
G54...G57
Include
DRF and
preset
Ref. system
GI positions
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–193
SINUMERIK 840C (IA)