Switch-Off Behavior - Siemens Second Wind Function Manual

Overview and definition of terms

1.3 Switch-off behavior

1.3 Switch-off behavior
Introduction
Different switch-off behavior is possible depending on the situation in the plant:
● Emergency stop
● Shutdown
● Local rampdown.
● Global rampdown
Plant switch-off differs in its triggers and effects.
No switch off triggering
In the plant the described switch-off behavior is only triggered if the F-CPU has been
programmed accordingly.
Emergency stop
The operator triggers the emergency stop by pressing the emergency stop button.
Emergency stop is a procedure in response to an emergency that is intended to stop a
process or movement that could result in danger (from EN 60204-1 Appendix D).
The emergency stop immediately stops all machines that are assigned to the F-CPU via the
safety program.
The emergency stop depends on the effective ranges.
The emergency stop button is always active if there is PROFIsafe communication between
HMI device and F-CPU, i.e. if the HMI device is integrated in the PROFIsafe communication.
Shutdown
Shutdown is triggered if the F-CPU detects a communication error on an HMI device which is
logged on in the effective range.
Shutdown is the immediate stopping of the machines which belong to the effective range.
The shutdown is always specific to the effective range.
Local rampdown.
Local rampdown is triggered if the HMI device is logged on at the effective range and if it is
removed from the effective range for longer than 30 seconds.
Local rampdown is the defined shutdown of the machines belonging to the effective range
within a defined time period.
Local rampdown is always specific to the effective range.
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DANGER
Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0