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3.8
Safe state
The safe state for the Smart Element is the transmission of value “0” in the image of the
inputs to the safe controller.
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 error or unparameterized state
5. Error detection during safe communication
3.8.1
Operating state
In the operating state, the inputs can enter states “1” or “0”.
3.8.2
Error detection in I/O devices
If an error is detected at an input, the safe state is set at this input. “0” is represented in the
process image of the input.
If cross-circuit monitoring has been parameterized and detected,
all
inputs enter the safe
state.
Depending on the parameterization, the following errors can be detected at the inputs, for
example:
– Short circuit
– Cross-circuit
– Overload or short circuit of the clock outputs
Diagnostic messages
The diagnostic message is transmitted to the controller.
See
“Errors: messages and removal” on page 67
.
For information on which errors occur and when, please refer to the following section.
See
“Connection examples of safe inputs” on page 45
.