5. Operating elements of the teach pendant
26
Festo GDCP-CDSA-SY-EN 1001a
5.1.2
Panic actuation
Switching positions of the permission button
Switch position Function
Permission button
Switch contact
1
Zero position
not actuated
off (opened)
2
Permission
is actuated
on (closed)
3
Panic
is pressed
off (opened)
Tab. 5.1: Switching positions of the permission button
Please note
When the actuating elements are pressed in the panic position,
the permission position will be bypassed when the elements are
released again.
Please note
Permission buttons are always designed with 2-circuitson the CDSA
teach pendant.
Safety category 3 PL
d
as per EN ISO 13849-1 can be fulfilled by implementation of the
permission device with 2 circuits.
Safety category 3 means that 1 error must not lead to loss of safety and whenever carried
out correctly the individual error must be recognized.
Monitoring the simultaneity is required because otherwise there could be an accumula-
tion of errrors, which would consequently lead to loss of safety.
Example:
If one channel of the permission device gives permission due to an error, and the second
channel also gives permission due to an error after an undefined period, it is no longer
possible for the permission button to switch off.
Standard EN 60204-1:1997 specifies that the permission device must be connected to a
stop of category 0 or 1, i.e. that the energy must be switched off.
