Technical data

Cause of interrupt
ISTACK
ID
Meaning (called error OB)
REG-FE
Error processing the controller structure R64 in the
CYCLE
STUEB
Block stack overflow:
nesting depth too great; required
measure: COLD RESTART)
STUEU
Interrupt stack overflow:
nesting depth too great; required
measure: COLD RESTART)
Table 5-7 continued:
WECK
Collision of time interrupts:
before or during the processing of a time
interrupt OB, an attempt was made to
call the same OB a second time
DOPP
Double call error
a still active error program processing level
(ADF, BCF, LZF, QVZ, REG, ZYK) is
activated a second time (COLD RESTART
required)
Control Bits and Interrupt Stack
CPU 928B Programming Guide
5 - 24 C79000-B8576-C898-01