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2546099-01-10/21 (translation of the original operating instructions)
Operating Instructions
Electronic-Key-System EKS2
EN
3. Description of the safety function
Devices from the series EKS2-… feature the following safety function:
Safe switching and monitoring of the selected operating mode
(subsystem of the safety function
selection of operating mode
according to EN ISO 13849-1)
Ì
Safety function:
-Safe selection of an operating mode using a touch panel
-Safe detection of a change of operating mode
Ì
Safety characteristics: category, Performance Level, PFHD (see chapter
).
Selection of operating mode
As a subsystem, the device fulfills the subfunctions of an operating mode selector that controls the machine’s safety functions
required for the selected operating mode. A failure or malfunction of selection of operating mode can lead to the safety
functions of the selected operating mode not being activated in the machine.
A system for selection of operating mode can be subdivided into the following subfunctions according to EN ISO 16090-1,
for example:
Ì
Access system
Ì
Selection system
Ì
Activation system
Incorrect behavior or an error in the
selection system
subfunction can lead to the safety function of the overall
selection of
operating mode
system failing.
The device fulfills the
access system
subfunction and, in combination with a touch panel, the
selection system
subfunction.
The safety function is ensured by a two-stage interaction between the device and the touch panel. This involves prompting
confirmation of the selection in a new, additional dialog.
Reading card
Checking selection
Checking confirmation
Setting outputs to safe
control system
Selecting operating
mode
Confirming selected
operating mode
Activating new
operating mode
EKS2
Touch panel
Safe control system
Fig. 1:
Two-stage interaction between EKS2 and touch panel
