3. Diagnosis
3-19
Festo Festo P .BE CP FB13-E-EN en 9910c
Y o u can set two ways in which the control system reacts to
faults:
– When a fault occurs, the controller switches to the operat-
ing mode “STOP” (hard error reaction) or
– When a fault occurs, the controller switches to the operat-
ing mode “RUN” (softerror reaction).
Control system
Module Meaning STOP RUN
SIMATIC S5 with
IM 308C
OB23 Reaction to QVZ with direct pe-
riphery access
default OB is programmed
OB24 Reaction to QVZ with periphery
access via process image
default OB is programmed
OB35 Reaction to PEU (periphery un-
certain)
default OB is programmed
SIMATIC S7/M7 OB82 Reaction to a device-specific di-
agnosis
default OB is programmed
OB86 Reaction to failure of a DP slave default OB is programmed
Further details can be found in the relevant manuals for the
control systems.
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