Siemens SIMATIC S5-100U System Manual page 91

S5-100U
Table 5-2. ISTACK Output (Bytes 17 to 32) [continued]
Bit
7 6
Byte
17 2nd nesting level
18 3rd nesting level
19 Nesting depth (0 to 6)
20 1st nesting level
21 Start address of the data block (high)
22 Start address of the data block (low)
23 Block stack pointer (high)
24 Block stack pointer (low)
25 Step address counter (high)*
26 Step address counter (low)*
27 Operation register (high)
28 Operation register (low)
29 ACCU 2 (high)
30 ACCU 2 (low)
31 ACCU 1 (high)
32 ACCU 1 (low)
*
The absolute memory address of the next statement to be processed from the faulty block is displayed.
If the step address counter displays a DB1 address, then there is a DB1 parameter setting error (see
section 9.1).
EWA 4NEB 812 6120-02b
5 4 3
Diagnostics and Troubleshooting
2 1 0
OR VKE FKT
OR VKE FKT
OR VKE FKT
Abso- Syst. Da-
lute ta Word
Addr. (SD)
EBA4 SD 210
EBA2 SD 209
EBA0 SD 208
EB9E SD 207
EB9C SD 206
EB9A SD 205
EB98 SD 204
EB96 SD 203
5-3