B&R Mobile Panel 40, User Manual, Page: 20 / 142

Technical data
20 Mobile Panel 40/50 User's manual V1.80
Sw
itc
h
po
si
tio
n
Zero
Time
Enable
Panic
Figure 6: Enable switch - Zero position
2.2.2.1.2 Enable
Position "Enable" is the normal operating mode for the enable switch . In this position, it is possible to initiate an
axis movement by subsequently pressing a direction key, for example.
When actuated, the enable
switch moves from position "Zero" to position "Enable". When released, it returns to
position "Zero".
Sw
itc
h
po
si
tio
n
Zero
Time
En
ab
le
R
ele
as
e
Enable
Panic
Figure 7: Enable switch - Enable
2.2.2.1.3 Panic
If the enable switch is fully actuated (position "Enable" to position "Panic") and released, then the switch will return
to position "Zero" by skipping over position "Enable".
Sc
ha
lte
rs
te
llu
ng
Null
Zeit
D
ur
ch
dr
üc
ke
n
Zu
st
im
m
en
Lo
sla
ss
en
Zustimmung
Panik
Figure 8: Enable switch - Panic
Safety category 3 PL d can be achieved per EN ISO 13849-1:2008 by implementing the enabling device with 2
circuits and suitable monitoring for short circuits and cross faults of these circuits.
Safety category 3 PL d means that 1 fault is not permitted to lead to a loss of safety and whenever reasonably
practicable, the individual fault is detected.
Connection examples
"Connection example for stop button" on page 70 and "Connection example for enable
switch" on page 71 show how safety category 3 PL d can be achieved with the Mobile Panel and its safety -
related components. It is important to note that the entire concept of the machine must be designed for this.
Simultaneity monitoring by the monitoring device is required because otherwise an undetected accumulation of
errors could occur that would lead to a loss of safety :
Example:
If one channel of the enabling equipment
switch es to "Enabled" due to an error and, after an unspecified amount
of time, another error causes the second channel to also switch to "Enabled", then the enable switch would no
longer be able to cut off the system.
EN 60204-1 also stipulates that the enabling device must be connected to a category 0 or 1 stop, i.e. that the
energy must be cut off.