SmartPLC SafeLine with PROFIBUS slave interface
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Safe state
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The safety module of AC412S is always in the safe state. Exceptions are the following operating
states of the fail-safe PLC:
debug operation
download operation
safe operation
If a fatal, serious or exception error occurs during these operating states, the safety module of
AC412S goes into the safe state.
The safe state is characterised by the following features:
All safe output channels of the local I/O interface are already power-free
All safe AS-i control slaves have stopped sending code sequences
the fail-safe PLC is in the STOP mode
the cyclic data transfer between safety module and basic device is interrupted
the data packages of the safe cross communication between the two safety CPUs are filled with
zero sequences and marked as "invalid"
the basic device detects that the safety module is in the safe state and provides this information in
the OSC and on the PROFIBUS and configuration interface
All non safety-relevant functions of the basic device continue to be available in the safe state.
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Reset error
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All error states (
→
Error classes
(
)) can only be exited using one of the following measures.
► Reboot the device (power-on reset)