Siemens SIMATIC S5 Manual page 189

Error Diagnostics
Display
BLOCK STACK
BLOCK NO. BLOCK ADDR.
PB 4
PB 2
OB 1
Figure 5-6. "BSTACK" Display on a PG 675 Programmer
The display in Figure 5-6 indicates that DB 5 was accessed incorrectly on the path OB 1
PB 4.
5-8
RETURN ADDR. REL. ADDR.
B19A
B168
B1CE
B1B4 001A
B17C 0014
B1F8 002A
06FS
S5-115F Manual
DB NO. DB ADDR.
5 B214
5 B214
5 B214
PB 2
EWA 4NEB 811 6149-02