Siemens SINUMERIK 840D sl Programming Manual page 869

Meaning
CPBC:
<following axis>:
<criterion>:
Example
Program code
; Block change takes place with:
;
;
CPBC[X2]="IPOSTOP"
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
- Coupling to following axis X2 == active
- Setpoint synchronism == active
Block change criterion with active coupling
Axis identifier of the following axis
Block change criterion
Type: STRING
Value Meaning: Block change is performed
"NOC" Irrespective of the coupling status
"IPOSTOP" For setpoint synchronism
"COARSE" For actual value synchronism "coarse"
"FINE" For actual value synchronism "fine"
Work preparation
3.14 Path traversing behavior
869