Operation
6.2 Typical applications
Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
89
Action
The operator presses the enabling switch. Unintentional incorrect operation of the enabling switch.
Instead of operating the switch in the center, the operator pressed it at the edge.
Result
The enabled state is deactivated immediately after discrepancy was detected. The "Enabling switch
discrepancy error" dialog box opens on expiration of the discrepancy time (see Technical data for fail-
safe operation (Page 109)).
The dialog stays open until this discrepancy is cleared.
The enabling switch must be released completely and pressed again to recover the enabled state.
The HMI device has then recovered the fully functional state.
•
The HMI device is integrated without being logged on to an effective range:
6$)(
3:5
&20
51*
%$7
•
The HMI device is integrated and logged on to an effective range:
6$)(
3:5
&20
51*
%$7
The enabling switch is damaged
Initial situation
The HMI device is integrated and logged on to an effective range. The enabling switch is damaged
and is not pressed. Distinguish between the two scenarios:
•
Scenario 1: One channel of the enabling switch is opened permanently.
•
Scenario 2: One channel of the enabling switch is closed permanently. Discrepancy is detected in
this situation. The "Enabling switch discrepancy error" dialog is displayed.
6$)(
3:5
&20
51*
%$7
Action
The operator presses the enabling switch.
