Siemens SIMATIC S5 - Page 187

Error Diagnostics S5-115F Manual
When the CPU reaches the illegal statement, it interrupts program scanning and goes into the
”STOP” mode with the ”NNN” error message. The STEP address counter is at the absolute address
of the next statement in the program memory that still has not been processed.
Absolute addresses in
the internal RAM
25
26
B0
42
Byte Contents
STEP Adress Counter
It is impossible to locate a program error
from the physical address of the illegal
statement in the RAM.
The ”DIR PLC” function indicates the
absolute start addresses of all
programmed blocks.
You can locate a program error by
comparing these two addresses.
OB 1 header
00 JU PB 0
B00A
B00B
B000
B009
02 BE
B00C
B00D
PB 0 header
B00E
B017
00
B018
B019
i JU PB 7
B02E
B02F
i+2 JU PB 7
B030
B031
PB 7 header
00
B03C
B03D
B032
B03B
02
B03E
B03F
04
B040
B041
xx BE
FFFF
B042
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Figure 5-4. Addresses in the CPU Program Memory
Display of Statements Containing Errors
The PG ”SEARCH” function is used to find specific program locations ( 4.3). You can use this
function to find the relative error address.
5-6 EWA 4NEB 811 6149-02