Mitsubishi 00JCPU User Manual page 458

(3) Precautions
1) The same pointer number cannot be used as a label.
Doing so will result in a "Pointer configuration error" (error code: 4021).
2) If the total number of the local pointer points used in several programs exceeds the start number of the
common pointer, a "Pointer configuration error (error code: 4020) will occur.
Using P0 to P99
100 points of
P0 to P99 occupied
The jump instructions are not capable of executing a jump to the common pointer in other programs.
Use the common pointer with subroutine call instructions only.
9 - 83
Program A Program B
Using P0 to P99
100 points of
P0 to P99 occupied
Total of 400 points
are used.
Figure 9.89 Concept of the common pointer range
Program C
Using
P0 to P199
200 points of
P0 to P199 occupied
P400 and higher numbers
can be used for the common pointer.