S5-95F Testing the User Program and Storing It on the Memory Submodule
14.2.2 Descriptions of the ISTACK Flags
Table 14-6 shows the causes of error which can cause interruption of a program scan. The PLC
goes to "STOP" in all cases.
Table 14-6. Interrupt Analysis
Corrective MeasuresISTACK
Flags
Cause of Error
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ASPFA and
KEINAS
NNN
SAC=FFFF
NAU Power failure
Program transfer error
Overflow of the internal program memory
during compilation.
PG PLC or memory submodule PLC
Shorten program, compress memory
During automatic program loading
• No battery/no charge and no valid
program on memory submodule
BAU Replace battery and rewrite or reload
program
STOPS
STS
Mode switch set to STOP Set PLC to RUN
• Software STOP programmed by user
(STP)
• STOP request issued via programmer
STUEB Block stack overflow. Maximum block
nesting depth error (16) exceeded.
Eliminate program error
NNN
PEU
Program in PLC memory is defect.
Cause:
• Power failure occurred during:
- Memory compression
- A block transfer from PG to PLC
or from the memory submodule to
the PLC
- An overall PLC reset
• Battery was changed during a power
outage
Execute overall reset and reload
program
NINEU
• Non-decodable instruction
• Nesting level exceeded
• Parameter assignment error
Eliminate program error
• Expansion module not connected
• I/O bus fault
• Maximum length of shift register
exceeded
• Unknown module
• Module in wrong slot
• Check power supply in expansion
unit
• Check all connections
• Check module slots
• Replace defective modules/bus
modules
EWA 4NEB 812 6210-02
14-9
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