Siemens SINUMERIK 828D Function Manual page 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:
Machine data
MD28082 $MC_MM_SYSTEM_FRAME_MASK
MD28083 $MC_MM_SYSTEM_DATAFRAME_MASK
MD24006 $MC_CHSFRAME_RESET_MASK.
MD24007 $MC_CHSFRAME_RESET_CLEAR_MASK
MD24008 $MC_CHSFRAME_POWERON_MASK
The axis position in the relative coordinate system WCS
variable can be read in part program, BTSS and via synchronous actions.
The axis position in the relative coordinate system ENS
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)"
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
K2: Axis Types, Coordinate Systems, Frames
Bit Description
11 Creation of $P_RELFR; with this, relative
coordinate systems become existent.
11 Data maintenance frame $P_RELFR
11 $P_RELFR becomes active at Reset
11 $P_RELFR is deleted at Reset
11 $P_RELFR is deleted at PowerOn
can be read via the variable $AA_PCS_REL[ax]. The
Rel
can be read via the variable $AA_ACS_REL[ax]. The
Rel
10.5 Frames
737