Description Of Functions - Siemens SINUMERIK 840Di Manual

06.03
16.3 Travel to fixed stop with high-resolution torque reduction (SW 2.2 and higher)
16.3 Travel to fixed stop with high-resolution torque
reduction (SW 2.2 and higher)
The full description of functions for "Travel to fixed stop" can be found in:
References: /FB1/
16.3.1

Description of Functions

With travel to fixed stop, you specify the torque reduction of the drive torque effective in the drive
(terminal torque) via the parts program instruction FXST.
For PROFIBUS drives, up to now the torque reduction was at a resolution of 1% and could not be
changed. With SW 2.2 and higher, you can set the torque reduction in the range from 0.01% to 10%
providing the required NC and drive parameters have been set.
16.3.2 Requirements
Basic
requirements
Automatic
adjustment
During SINUMERIK 840Di boot and in the state: "Incoming station" of the DP slave 611U, the SI-
NUMERIK 840Di NC cyclically reads parameter P881 from the drive and transfers it to the appropri-
ate axis-specific NC machine data:
Manual
adjustment
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Description of Functions, Basic Machine
Section: F1 Travel to fixed stop
The following basic requirements must be met to set the parameters for torque
reduction resolution:
– There must be a parameter in the drive via which the resolution for the
torque reduction can be set at the drive end.
– The drive is operating with a message frame type containing the control
word: TorRed (torque reduction) e.g. SIMODRIVE standard message
frame 102 to 107.
To simplify the start-up of torque reduction, the SINUMERIK 840Di NC carries
out an automatic matching procedure using the torque reduction resolution
parameterized in the drive. The following requirements must be met:
– The drive supports acyclic communication and it is enabled on the NC
side. For information on how to enable acyclic communication on the
NC, please see the description of NC machine data:
S
MD 13070: DRIVE_FUNCTION_MASK[n] (used DP functions)
– Parameter P881 is present in the drive with the corresponding meaning
and a scaling of 16384 ¢ 1%.
S
MD 37620: PROFIBUS_TORQUE_RED_RESOL (torque reduction resolu-
tion on PROFIBUS (LSB weighting)).
If the requirements are not met for automatic adjustment, then the parameters
can be set manually for the SINUMERIK 840Di NC if the resolution of the torque
reduction is parameterized in principle in the mappable range (0.01% to 10%).
16 840Di Specific Data and Functions
16-511