You can set two types of reactions to faults in the con-
trol system:
• the controller switches to operating mode STOP
when a fault occurs (hard error reaction) or
• the controller remains in operating mode RUN when
a fault occurs (soft error reaction)
Control
system
Module Meaning STOP RUN
SIMATIC S5
with IM 308C
OB23 Reaction to QVZ with
direct periphery access
default OB is
programmed
OB24 Reaction to QVZ with
periphery access via
process image
default OB is
programmed
OB35 Reaction to PEU
(periphery unclear)
default OB is
programmed
SIMATIC S7/M7 OB82 Reaction to device
specific diagnosis
default OB is
programmed
OB86 Reaction to failure of a
DP slave
default OB is
programmed
Further details can be found in the appropriate manuals
for the control systems.
3. Diagnosis
CP FB13-E 9904b 3-19
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