Siemens SIMATIC S5 Manual page 185

Error Diagnostics
Use Table 5-2 to determine the cause of a fault or an error when program scanning is interrupted.
In each case, the CPU goes into the "STOP" mode.
F
ault/Error
Fault/Error
NINEU
Cold restart is
SYNFEH/
not possible
KOPFNI
Faulty
ASPFA
submodule
Battery fault
I/Os not ready
Program
STOPS
scanning
interrupted
TRAF
STUEB
FIF-FEHLER
SYSFE
5-4
Table 5-2. Meaning of the ISTACK Displays
ID
Faulty block:
- System startup fault.
- Compressing has been interrupted by a
power failure.
- Block transfer between programmer and
PLC was interrupted by a power failure.
- Program error (TIR/TNB/DO FW).
The submodule ID is illegal:
- S5-110S/S5-135U/S5-150U submodule
There is no battery or the battery is low.
BAU
The I/Os are not ready:
PEU
- There has been a power failure in the
expansion unit.
- The connection to the expansion unit has
been interrupted.
- There is no terminator in the central
controller.
The mode selector is on STOP.
Substitution error:
SUF
A function block was called with an
incorrect actual parameter.
Transfer error:
- A data block statement has been
programmed with data word number
greater than the data block length.
- A data block statement has been
programmed without opening a DB first.
- A statement cannot be decoded.
NNN
- The nesting level has been exceeded.
- A parameter has been exceeded.
- Software stop by statement (STP)
STS
- STOP request from programmer
- STOP request from SINEC L1 master
Block stack overflow:
- The maximum block call nesting depth of
16 has been exceeded.
Multiple message S5-115F.
Error with "STOP" response.
NAU There has been a power failure.
Time-out from I/Os:
QVZ
- A peripheral byte that was not addressed
has been referenced in the program.
- An I/O module does not acknowledge.
Scan time exceeded:
ZYK
- The program scanning time is greater
than the set monitoring time.
Error in SYSID block
Cause
S5-115F Manual
Remedy
Perform an Overall Reset.
Reload the program.
Plug in the correct submodule.
Replace the battery.
Perform an Overall Reset.
Reload the program.
- Check the power supply in the
expansion unit.
- Check the connection.
- Install a terminator in the central
controller.
Put the mode selector on RUN.
Correct the function block call.
Correct the program error.
Correct the program error.
Correct the program error.
Error analysis with DB 2,3
with COM 115F ( 5.5)
Correct the program error or
replace the I/O module.
Check the program for continuous
loops. If necessary, change the
monitoring time.
Check program
EWA 4NEB 811 6149-02