CONDITION CODE
see Section 3.5
CAUSE OF INTERR.
The following abbreviations (ISTACK IDs) indicate the most important
causes of interruptions.
CAUSE OF INTERR.
ISTACK
ID
Meaning (called error OB)
KB Called block not loaded (OB 19)
KDB Opened data block not loaded (OB 19)
TRAF Load or transfer error (OB 32)
SUF Substitution error (OB 27):
Processed STEP 5 operation cannot be
substituted
STUEB Block stack overflow:
Nesting depth too great; required action:
COLD RESTART
STUEU Interrupt stack overflow:
Nesting depth too great; required action:
POWER DOWN, POWER UP,
then COLD RESTART
NAU Power failure in the central controller
QVZ Timeout (OB 23/OB 24/OB 28/OB 29)
ADF Addressing error for digital inputs and outputs with
process image (OB 25)
PARE Parity error (OB 30)
ZYK Cycle monitoring time exceeded (OB 26)
STOP STOP mode caused by setting the mode selector to the
STOP position
STS STOP mode caused by STEP 5 operation ’STS’ (after
executing an operation)
Table 5-6 ISTACK IDs CAUSE OF INTERRUPTION
Control Bits and Interrupt Stack
CPU 948 Programming Guide
C79000-G8576-C848-04
5 - 17
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