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S5-115U Manual
Table 5-5. Meaning of ISTACK Displays (Continued)
Fault/Error
Cause
Error/Fault
(ID in
ISTACK)
Program
SUF
scanning
interrupted
TRAF
STS
NNN
STUEB
NAU
QVZ
ZYK
EWA 4NEB 811 6130-02b
Cause
Substitution error:
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.
- DB to be generated is too long for user
memory (G DB operation)
- Software stop by statement
(STP, STS)
- STOP request from programmer
- STOP request from SINEC L1 master
- A statement cannot be decoded.
- A parameter has been exceeded.
Block stack overflow:
- The maximum block call nesting depth of
32 has been exceeded.
- Interupt-driven or time-driven program
interrupts cyclic program during pro-
cessing of an integrated function block
and an integrated function block is also
called in the interrupting program.
There has been a power failure.
Time-out from I/Os:
- A peripheral byte that was not addressed
has been referenced in the program.
- An I/O module does not acknowledge.
Scan time exceeded:
The program scanning time is greater than
the set monitoring time.
Error Diagnostics
Remedy
Correct the function block call.
Correct the program error.
Correct the program error.
Correct the program error.
Disable interrupts in the cyclic pro-
gram before calling integrated
function blocks.
Correct the program error or
replace the I/O module.
Check the program for continuous
loops. If necessary, retrigger the
scan time with OB31 or change the
monitoring time.
5-7
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