Overview and definition of terms
1.3 Switch-off behavior
Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
17
Global rampdown
Global rampdown is triggered if the F-CPU detects a communication error on an HMI device
which is integrated in the PROFIsafe communication.
Global rampdown is the defined shutdown of the machines assigned in the safety program
within a defined time period.
Global rampdown is independent of the effective ranges.
In the safety program of the F-CPU, ensure that global rampdown is available in the event
that a communication error occurs on an HMI device which is integrated in the PROFIsafe
communication.
Trigger
The switch off can have the following triggers:
● The operator presses the emergency stop button.
● A communication error occurs.
● Timeout: The HMI device is logged on at the effective range and the operator leaves the
effective range with his HMI device for longer than 30 seconds.
Triggering the switch off
The following table shows the effect of the different triggers depending on the operating
situation:
Trigger
Operating situation
Emergency stop
pressed
Communication
error
Timeout
HMI not integrated
---
---
---
HMI device is in the
effective range
Emergency stop
Shutdown
---
HMI device is outside of the
effective range for less than
30 seconds
Emergency stop
Shutdown
---
HMI device logged on
at the effective range
HMI device is outside of the
effective range for longer
than 30 seconds
Emergency stop
Shutdown
Local
rampdown.
HMI
integrated
HMI device is logged off from the effective range
Emergency stop
Global
rampdown
---
