Overview
1.13 Terms for fail-safe operation
Wireless Teach Pendant F IWLAN V2
Operating Instructions, 08/2010, A5E02453837-01
33
If a communication error occurs, the HMI device is removed from the safety-related
communication. The HMI device is automatically logged off the machine. The fail-safe
controller brings the plant to a safe operating state.
Shutdown response of the plant
● The following shutdown response of the plant applies regardless of whether or not the
HMI device is logged onto a machine.
– EMERGENCY STOP
EMERGENCY STOP is a procedure that is intended to stop a process or movement
associated with danger in accordance to EN 60204-1, Appendix D. An EMERGENCY
STOP immediately stops all parts of the plant controlled by the fail-safe controller via a
safety program. The EMERGENCY STOP button is always enabled when there is
PROFIsafe communication between HMI device and fail-safe controller, i.e. when the
HMI device is integrated in the PROFIsafe communication.
– Global rampdown
A global rampdown is the intentional stopping of the plant. The global rampdown is
independent of the area.
The global rampdown is triggered by the fail-safe controller, for example, if an error
occurs with an HMI device integrated in the PROFIsafe communication.
● The following shutdown response of the plant applies when the HMI device is logged onto
a machine.
– Local rampdown
A local rampdown is the intentional stopping of a plant section by the fail-safe
controller. The local rampdown is triggered, for example, when the operator leaves the
protection zone without logging off via a security system.
– Shutdown
The shutdown is triggered when the F-CPU has detected a communication error with
an HMI device that is logged onto a machine. Shutdown is the immediate stop of all
machinery being operated in fail-safe mode.
Communication error
A communication error occurs when the communication between HMI device and fail-safe
controller is interrupted. Additional information is available in the section "Communication
error for the integrated HMI device (Pag
e 256)".
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