Function Manual
94 01/2017
"Single block coarse" is the default setting after switching on.
In a series of G33 blocks single block is effective only if "dry run feedrate" is selected.
The selection signal normally comes from a user machine control panel.
This function must be activated by the PLC user program via the IS "Activate single block" (DB3200.DBX0000.4).
The preselection whether "Single block coarse" or "Single block fine" type is made in the user interface in the "Program
control" menu.
The checkback signal that single block mode is active is displayed in the relevant "SBL" field on the operator interface.
Because of the single block mode, as soon as the part program processing has processed a part program block:
● The following interface signals are set:
– IS "Channel status interrupted" (DB3300.DBX0003.6)
– IS "Program status stopped" (DB3300.DBX0003.2)
● The following interface signals are reset:
– IS "Channel status active" (DB3300.DBX0003.5)
– IS "Program status running" (DB3300.DBX0003.0)
Program processing with dry run feedrate (DRY)
Functionality
The part program can be started via IS "NC Start" (DB3200.DBX0007.1). When the function is active, the traversing
velocities programmed in conjunction with G1, G2, G3, CIP, and CT are replaced by the feed value stored in SD42100
DRY_RUN_FEED. The dry run feedrate also replaces the programmed revolutional feedrate in program blocks with G95.
However, if the programmed feedrate is larger than the dry run feedrate, then the larger value is used.
Damage to the workpiece or machine tool
Workpieces may not be machined when "dry run feedrate" is active because the altered feedrates might cause the
permissible tool cutting rates to be exceeded and the workpiece or machine tool could be damaged.
Operation with dry run feedrate is selected via the following operations in the "AUTO" mode:
->
IS "Dry run feedrate" (DB1700.DBX0000.7) is set on selection of the function. In addition, the required dry run feedrate must
be entered via the following softkey on the HMI:
This does not activate the function.
This function is activated via the IS "Activate dry run feedrate" (DB3200.DBX0000.4) and is evaluated at NC start.
The dry run feedrate must be entered before program start in SD42100 DRY_RUN_FEED.
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