Siemens SINUMERIK 828D

K2: Axis Types, Coordinate Systems, Frames
10.5 Frames
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
737
Figure 10-21 Relative coordinate systems
The data maintenance frame $P_RELFR can be written in the part program and via BTSS. All the frame
components can be modified.
The active system frame $P_RELFRAME can be written in the part program and via BTSS.
The configuring of the system frame $P_RELFR is done via the following machine data:
The axis position in the relative coordinate system WCS
Rel
can be read via the variable $AA_PCS_REL[ax]. The
variable can be read in part program, BTSS and via synchronous actions.
The axis position in the relative coordinate system ENS
Rel
can be read via the variable $AA_ACS_REL[ax]. The
variable can be read in part program, BTSS and via synchronous actions.
The setting of a relative reference point via the operator panel is done via the general command interface for the
workpiece and tool measuring. The system frame $P_RELFR for relative coordinate systems is calculated and
activated as follows:
• $AC_MEAS_TYPE = 14
• PI-services _N_SETUDT(6, 7)
An example for setting the relative axis positions is given in:
References:
/FB2/ Functions Manual Extended functions; Measurement (M5),
Chapter "Measurement of Geo- and special axes (Meas Type 14, 15)"
Machine data Bit Description
MD28082 $MC_MM_SYSTEM_FRAME_MASK 11 Creation of $P_RELFR; with this, relative
coordinate systems become existent.
MD28083 $MC_MM_SYSTEM_DATAFRAME_MASK 11 Data maintenance frame $P_RELFR
MD24006 $MC_CHSFRAME_RESET_MASK. 11 $P_RELFR becomes active at Reset
MD24007 $MC_CHSFRAME_RESET_CLEAR_MASK 11 $P_RELFR is deleted at Reset
MD24008 $MC_CHSFRAME_POWERON_MASK 11 $P_RELFR is deleted at PowerOn
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