Operating Instructions
5
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 ENISO13849-1)
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 13. Technical data on page 14).
Selection of operating mode
As a subsystem, the device fullls 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 ENISO16090-1,
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 fullls the access system subfunction and, in combination with a touch panel, the selection systemsubfunction.
The safety function is ensured by a two-stage interaction between the device and the touch panel. This involves prompting
conrmation of the selection in a new, additional dialog.
Reading card
Checking selection
Checking conrmation
Setting outputs to safe
control system
Selecting operating
mode
Conrming selected
operating mode
Activating new
operating mode
EKS2
Touch panel Safe control system
Fig. 1: Two-stage interaction between EKS2 and touch panel