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2.7 Safe state
The safe state for the module is the low state at the output terminals (see Section “Safe dig-
ital outputs” on page 20).
The safe state can be entered in the following cases:
1. Operating state
2. Error detection in I/O devices
3. Device error
4. Parameterization errors
2.7.1 Operating state
In the operating state, the outputs can enter states “1” or “0”. In general, state “0” is the safe
state.
2.7.2 Error detection in I/O devices
Outputs If an error is detected at an output, the affected output is disabled (“0” = OFF = safe state).
Depending on the parameterization, the following errors can be detected at outputs:
– Short circuit
– Cross-circuit
– Overload
– Violation of the parameterized shutdown time (INTERBUS-Safety only)
The relevant diagnostic message is transmitted to the safe controller (see Section “Safe dig-
ital output errors” on page 71). For information on which errors are detected and when,
please refer to “Connection examples for safe outputs” on page 55.
PROFIsafe:
The safe state for the F-Output data is “0”.
The safe state is entered by means of passivation (see “Passivation” on page 92).
WARNING: No communication; loss of the safety function possible due to unde-
tected accumulation of errors
If there is no communication with the safe controller: Disconnect the module from the sup-
ply voltage after a maximum of eight hours.
If an error occurs on a channel of an output parameterized as “two-channel”, the other cor-
responding channel also enters the safe state.