Siemens SIMATIC S5-100U System Manual page 90

Diagnostics and Troubleshooting
The following table shows which positions in the bit pattern are relevant for error diagnosis (gray-
shaded bits).
Bit
7 6
Byte
1
2
STO STO
3
ZUS ANZ
4
5
KEIN SYN
6
AS FEH
7
8
9 STOPS
10 NAU
11
12 ANZ1 ANZ0
13 6th nesting level
14
15 4th nesting level
16 5th nesting level
5-2
Table 5-2. ISTACK Output (Bytes 1 to 16)
5 4 3
BST SCH ADR
SCH TAE BAU
NEU BAT
STA PUF
KOPF
NI
NINEU
IRRELEVANT
IRRELEVANT
SUF TRAF NNN
ZYK SYSFE
OVFL OR
IRRELEVANT
2 1 0
AF
UR
LAD
STS STUEB
PEU BAU ASPFA
STA
VKE ERAB
TUS
OR VKE FKT
OR VKE FKT
OR VKE FKT
EWA 4NEB 812 6120-02b
S5-100U
Abso- Syst. Da-
lute ta Word
Addr. (SD)
EA0A SD 5
EA0C SD 6
EA0E SD 7
SD 214
EBAC
(UAW)
EBAA SD 213
EBA8 SD 212
EBA6 SD 211