KP8, KP8F, KP32F
Operating Instructions, 11/2011, A5E03284305-02
95
Fail-safe operation of KP8F and KP32F
7
7.1 Overview
Fail-safe mode
In fail-safe mode the HMI device recognizes signal states from suitable fail-safe sensors and
sends corresponding safety telegrams to the fail-safe controller where the safety program
runs. The fail-safe controller and the HMI device communicate with each other using the fail-
safe protocol "PROFIsafe".
Safety functions
During fail-safe mode, safety functions are activated in both HMI and the fail-safe controller
which recognize faults and react to them.
In the following cases, the fitting system unit must be run in a secure operating state:
● The EMERGENCY STOP button is pressed.
● An sensor was actuated.
● A diagnosable error has occurred.
Reaction to pressed EMERGENCY STOP buttons or activation of sensor
If the EMERGENCY-STOP button was pressed or sensor was activated, the related BIT is
sent to the controller in a safety-related manner. The controller program analyzes if the
EMERGENCY STOP button was pressed or the sensor was activated.
Note
Which reactions this bit activates in the controller and thus, in the system, is the task of the
user. Tasks include:
• Configuring required responses appropriate for the EMERGENCY STOP in the controller
• Setting measures to repair the cause of an EMERGENCY STOP
• Configuring the startup behavior after an EMERGENCY STOP
The response to an EMERGENCY STOP or activation of the sensor, measures and startup
behavior must be described in the system documentation.
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