Technical data

5.5 Errors during RESTART
During initialization and during a restart, causes of interruptions and
errors can lead to the restart program being aborted and put the CPU
into the STOP mode. Interruptions occurring during the restart
program (organization blocks OB 20, 21 and 22) are handled just as in
the CYCLE.
Exception: if a STOP occurs during the restart, no organization block
OB 28 is called.
Causes of interrupt and
causes of error
There is no way of responding via a user interface (error OB) to the
causes of interrupt and causes of error listed in the table below.
Control bit
or ID in
ISTACK
Explanation
STP Stop command from system program (at FE-STP)
or in the user program
BAU Failure of the back-up battery on the central
controller
NAU Failure of the power supply in the central
controller
PEU Failure of the power supply in an expansion
unit
STUEU Stack overflow in interrupt stack (ISTACK)
STEUB Stack overflow in the block stack (BSTACK)
DOPP-FE Double call of an error program processing
level
RAM-FE Error during initialization: the contents of the
operation system RAM or the DB RAM are
incorrect
MOD-FE Error during initialization: the contents of the user
submodule (RAM or EPROM submodule) are not
correct
DB0-FE
1)
Error setting up the block address list
(DB 0)
DB1-FE
1)
Error evaluating DB 1 to set up the address list for
updating the process image
Table 5-9 Causes of error and causes of interrupt in RESTART
Errors during RESTART
CPU 928B Programming Guide
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