Block Change Behavior (Cpbc) - Siemens SINUMERIK 840D Function Manual

M3: Coupled axes
14.5 Generic coupling
Example:
Programming
CPFRS[X2]="BCS"
Constraints
● Co-ordinate reference has to be specified when creating a coupling module, else the default
value is used. It is not possible to effect subsequent changes.
● Simultaneous active transformation and coupling via RESET is not supported.
Solution: Switching off the coupling with CPMRESET="OF" with RESET switching it on again
with CPMSTART="ON" in the part program.
● Simultaneous operation of the previous function "Axial Coupling in the Machine Co-ordinate
System (MCS Coupling)" and the generic coupling is not supported.
● CPFRS is not available in the main run.
14.5.5.4

Block change behavior (CPBC)

The block change criterion can be used to specify under which conditions the block change with
activated coupling is to be permitted in the processing of the part program. The status of the
coupling influences the block change behavior. If the specified condition is not fulfilled, the
block change is disabled. The block change criterion is only evaluated with an active coupling.
The block change criterion can be defined with the keyword CPBC or with the programming
command WAITC. The instruction programmed last is valid.
Programming with PCBC
Syntax:
Identifiers:
Functionality:
Block change crite‐
rion:
512
"MCS" Machine Coordinate System
Default value: "BCS"
Comment
; The base co-ordinate system is the co-ordinate reference for
the coupling module with following axis X2.
CPBC[FAx]= "<block change criterion>"
Coupling Block Change Criterium
Defines block change criterion with active coupling.
Type: STRING
Range of values:
"NOC" Block change is performed irrespective of the cou‐
pling status.
Machine coordinate system
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA