Dry Run Feedrate - Siemens SINUMERIK 828D Function Manual

V1: Feedrates
17.4 Feedrate control
17.4.5

Dry run feedrate

Application
The dry run feedrate is used when testing part programs without machining the workpiece in order to allow the
program or program sections to execute with an increased path feedrate, for example.
"Dry run feedrate selected" DB21, .... DBX24.6
The dry run feedrate can be activated from the PLC or the operator panel.
When activated from the operator panel, interface signal "Dry run feedrate selected" (DB21, ... DBX24.6) is set
and transferred by the PLC basic program to interface signal "Activate dry run feedrate" (DB21, ... DBX0.6).
When selected on the PLC, the "Activate dry run feedrate" interface signal is required to be set by the PLC user
program.
The execution of the program is triggered with G94.
The dry run feedrate also takes precedence over the feedrates for G93,G95 and G33,G34,G35.
In this case, the programmed feedrate is compared to the dry run feedrate in:
SD42100 DRY_RUN_FEED
and the axis is then traversed at the higher of the two feedrates.
Dry run feedrate change "Dry run feedrate active" DB21, .... DBX318.6.
The dry run feedrate (SD42100 DRY_RUN_FEED = 1) can be changed via the operator panel in the operating
area "Parameters".
The interface signal "Dry run feedrate active" (DB21, ... DBX318.6) is set if the selection has been accepted by
the NCK. DRY is displayed in the operator panel status bar to indicate an active dry run feedrate if
• selection takes place when the program stops at the end of a block or if the machine data
• MD10704 DRY_RUN_MASK = 1 has been set during execution of the program.
If MD10704 DRYRUN_MASK = 0 has been set a dry run feedrate may only be activated/ deactivated at the end
of a block.
If the dry run feedrate is no longer selected, the interface signal "Dry run feedrate active" (DB21, ... DBX318.6) is
reset.
Evaluation
The effect of:
SD42100 DRY_RUN_FEED
can be controlled via another setting data:
1396
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions