User Manual
Appendix A
GFK-2843A
Jan 2020
VersaSafe system
90
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Application errors
A distinction is made based on:
–
The severity of the error
–
The reciprocal effects on other components in the system
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The acknowledgment and restart options
Acknowledgment The acknowledgment of an error is an intentional user action
(controlled via the application program) with the aim of showing
the system (or subsystem) that an error has been removed and
that the system (or subsystem) can reactivate the faulty
component.
Errors affecting a VersaSafe island are acknowledged via the
handling functional blocks of the IC220SDL963 (see Section
"
IC220SDL963 system handling in various control systems
A-11.1
Critical system or device errors
All errors that are detected and immediately switch the device to the failure state are
assigned to this class.
They include:
•
Hardware faults (detected by self tests within devices)
•
Control flow/program sequence errors within the firmware of a device
Errors in this class are usually errors within the system, the hardware or the firmware,
which were not caused by the user and cannot be removed (device-specific exceptions are
possible).
It is not possible to acknowledge the error or continue operating. The affected devices can
only be restarted via a voltage reset. If the power on self tests are successful following a
restart, the system can continue to operate.
A-11.2
Parameterization or configuration errors
All errors that are detected during the plausibility check of parameters and configuration
data are assigned to this class. This check is usually carried out during the initialization
phase of the system. Following the detection of an error in this class, the devices enter the
safe state and are still able to send diagnostic information or receive new parameter or
configuration data.
It is not possible to acknowledge the error or continue operating without modifying the
parameter or configuration data of the affected device.
A-11.3
Communication errors
All errors that can occur within the transmission path between the VersaSafe components
are assigned to this class. They are detected by the safety protocol.
They include, for example:
