Overview and definition of terms
1.6 Safety-oriented operator controls
Fail-safe operation of the Mobile Panel 277F IWLAN
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Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
1.6.2
Enabling button
Introduction
The enabling device consists of the two enabling buttons mounted on both sides of the
Mobile Panel 277F IWLAN. The switch setting of the two enabling buttons is determined by
electrical momentary contact switches.
Note
The HMI device analyzes the switch settings of the two enabling buttons in the form of an
OR gate.
①
Enabling button
Operation
WARNING
Unintentional enabling
Press the enabling button only until the operation you wish to enable is completed.
Enabling is a conscious operator action. It is not permissible to continuously press the
enabling button or to fix it in any way.
The following happens if you leave the effective range for a period of up to 30 seconds with
the enabling button pressed: Enabling is revoked 5 seconds after leaving the effective
range.
If you reenter the effective range within 30 seconds, you must release the enabling button
and press it again for enabling to take effect again.
The enabling button has three switch settings:
● Neutral position: The enabling button is not pressed.
● Enable: The enabling button is pressed to a mid position. This switch setting is used to
allow another command, for example an input with the membrane keyboard.
