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Result
Both enabling buttons were tested in the "Enable" and "Panic" switch positions.
The project start screen appears.
If the operator now exits the WLAN area, the F-CPU detects a communication error and
initiates a global rampdown. The "COM" LED on the HMI device flashes. The "Establishment
of safety connection" dialog with the text "No safe connection available. Reason:
Communication error (timeout)" is displayed.
6.2.3.2
Communication error for the integrated HMI device
Initial situation
The HMI device is integrated in the safety program of the F CPU. The HMI device is not logged on to
an effective range.
Action
The operator takes the HMI device out of the WLAN range. The "COM" LED flashes.
The F CPU detects a communication error and initiates a global rampdown.
The LEDs "SAFE" and "COM" are switched off. The user is informed that no safety functions are
available.
Scenario 1:
The operator returns to the WLAN range within
60 seconds.
Result scenario 1: return to the WLAN range
The "Acknowledgment of communication error" dialog box opens. In this dialog, the operator
acknowledges the communication error.
The global rampdown signal is canceled. PROFIsafe communication is possible again.
The HMI device has recovered the fully functional state.
Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
6.2 Typical applications
Scenario 2:
The operator stays outside the WLAN range.
Operation
87
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