X20(c)SA4430
Data sheet V1.141 X20(c)SA4430 Translation of the original documentation
13
8 Error detection
8.1 Internal module errors
The red "SE" LED makes it possible to evaluate the following error states:
•
Module error, e.g. defective RAM, defective CPU, etc.
•
Overtemperature/Undertemperature
•
Overvoltage/Undervoltage
•
Incompatible firmware version
Errors that occur within the module are detected according to the requirements of the standards listed in the
certificate and within the minimum safety response time specified in the technical data. After this occurs, the module
enters a safe state.
The internal module tests needed for this are only performed, however, if the module's firmware has been booted
and the module is in either the PREOPERATIONAL state or the OPERATIONAL state. If this state is not achieved
(for example, because the module has not been configured in the application), then the module will remain in the
boot state.
BOOT mode on a module is clearly indicated by a slowly blinking SE LED (2 Hz or 1 Hz).
The error detection time specified in the technical data is relevant only for detecting external errors (i.e. wiring
errors) in single-channel structures.
Danger!
Operating the safety module in BOOT mode is not permitted.
Danger!
A safety-related output channel is only permitted to be switched off for a maximum of 24 hours. The
channel must be switched on by the end of this period so that the module's internal channel test can
be performed.
