Safety instructions, standards and notes
2.7 Safety functions of the emergency stop button
Fail-safe operation of the Mobile Panel 277F IWLAN
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Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
WARNING
Emergency stop button not available
The emergency stop button on the HMI device must not used as a replacement for a
permanently-wired emergency stop/emergency off on the machine.
Install stationary emergency stop buttons that are available at all times on the configured
system.
WARNING
Effectivity of the emergency stop button
The following requirements must be met in order to render the emergency stop button
effective:
•
The HMI device must be operated in the charging station or operated with the battery.
•
The project must be running on the Mobile Panel 277F IWLAN.
•
The HMI device must be integrated in the safety program of the F-CPU.
If these prerequisites are satisfied the following applies:
•
The SAFE LED on the HMI device is illuminated.
•
The emergency stop button of the Mobile Panel 277F IWLAN is effective.
Category 0 or 1 Stop
If a Category 0 or 1 Stop circuit is implemented, the stop function must be in effect
regardless of the operating mode. A Category 0 Stop must have precedence. Release of
the emergency stop button should not cause a hazardous situation (see also EN
60204:1997 chapter 9.2.5.3).
The stop function is not to be used as a replacement for safety equipment.
NOTICE
The emergency stop button can be triggered unintentionally
The emergency stop button is evaluated under the following conditions:
•
The Mobile Panel 277F IWLAN is integrated in the safety program of the F CPU.
In the following cases, the emergency stop button can be triggered unintentionally, bringing
the configured system to a standstill:
•
If the HMI device falls down
•
When opening one of the coverings on the rear of the HMI device
WARNING
Emergency stop button disabled
If a global rampdown has been triggered by a communication error, the emergency stop will
no longer be available on the Mobile Panel in question.
You have the option of configuring the "Global rampdown" signal to trigger an emergency
stop.