Functions; Setting Zeros, Workpiece Measuring And Tool Measuring; Zero Offset External Via System Frames - Siemens SINUMERIK 828D Function Manual

10.5.8

Functions

10.5.8.1

Setting zeros, workpiece measuring and tool measuring

PRESET is achieved using HMI operator actions or measuring cycles. The calculated frame can be written to
system frame SETFRAME. The position setpoint of an axis in the WCS can be altered when the actual-value
memory is preset.
"Scratching" means workpiece and tool measuring. The position of the workpiece in relation to an edge, a corner
or a hole can be measured. To determine the zero position of the workpiece or the hole, position setpoints can be
added to the measured positions in the WCS. The resultant offsets can be entered in a selected frame. In tool
measuring, the length or radius of a tool can be measured using a measured reference part.
Measurements can be taken via operator actions or measuring cycles. Communication with the NCK takes place
via predefined system variables. In the NCK, the calculation is made by using a HMI operator action to activate a
PI service, or by using a part-program command from the measuring cycles. A tool and a plane can be selected
as a basis for the calculation. The calculated frame is entered in the result frame.
10.5.8.2

Zero offset external via system frames

Zero offset via PLC or part program
The amount of the external zero offset can be specified through HMI and PLC via BTSS or programmed in the
part program via the axis-specific system variable $AA_ETRANS [<Axis>] = <Value>.
Activation
The activation of the external zero offset takes place through the interface signal:
DB31, ... DBX3.0 (accept external zero offset)
Behavior
After the activation the respective specified axis-specific amount of the external zero offset is traversed outside
for each axis with the next possible traversing block.
Next possible means that enough dynamic reserves must be available for the respective axis for traversing the
zero offset. If the axis is traversed in the next traversing block after activation owing to its programming with the
maximum speed, dynamic reserve is no longer available for traversing the external zero offset.
Together with the continuous path mode G64 the traversing of the offset can stretch over several part program
blocks.
Zero offset via system frame
The external zero offset can then also be managed and activated by the functionality described above via the
system frame $P_EXTFRAME .
configuring
The configuring of the external zero offset is done via the system frame $P_EXTFRAME via bit1 = 1 in the
machine data: MD28082 $MC_MM_SYSTEM_FRAME_MASK = 'B0010'
The amount for the external zero offset can be specified manually via the HMI user interface and the PLC user
program via BTSS or programmed in the part program via the axial system variable $AA_ETRANS[<Axis>].
Activation
The activation of the external zero offset takes place through the interface signal:
DB31, ... DBX3.0 (accept external zero offset)
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
K2: Axis Types, Coordinate Systems, Frames
10.5 Frames
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