Diagnostics and Troubleshooting S5-100U
Table 5-2. ISTACK Output (Bytes 17 to 32) [continued]
*
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).
Step address counter (low)*
EB9C
Bit
Byte
Syst. Da-
ta Word
(SD)
6 5 4 3 2 1 0
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18
7
19
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31
32
OR VKE FKT
SD 210
SD 209
SD 208
SD 205
SD 204
SD 203
2nd nesting level
3rd nesting level
Nesting depth (0 to 6)
FKTVKEOR
1st nesting level FKTVKEOR
Start address of the data block (high)
Start address of the data block (low)
Block stack pointer (high)
Block stack pointer (low)
Operation register (high)
Operation register (low)
ACCU 2 (high)
ACCU 2 (low)
ACCU 1 (high)
ACCU 1 (low)
SD 207
SD 206
Step address counter (high)*
Abso-
lute
Addr.
EBA4
EBA2
EBA0
EB9E
EB9A
EB98
EB96
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The PG 615 displays the cause of an interrupt as plain text before the ISTACK is output.
5-4
EWA 4NEB 812 6120-02
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