Technical data
Mobile Panel 7100 User's manual 1.51
21
Category 4 PL e can be achieved per EN ISO 13849-1:2015 by implementing the enabling device with 2 circuits,
suitable dynamic monitoring for short circuits and cross faults and ensuring the simultaneity of these circuits of
the safety components.
Category 4 PL e means that a single fault is not permitted to lead to the loss of the safety function, and that a single
fault shall be detected at or before the next demand upon the safety function (e.g. immediately when switching
on or at the end of a machine cycle).
In accordance with EN 60204-1, the enabling device must be implemented such that at least stop category 0, 1
or 2 is initiated at position 1 ("off" function of switch, operating element not actuated) and position 3 ("off" function,
operating element actuated to position "Panic").
To calculate the PL of the enabling safety function, the safety characteristics (PL and B
10d
values) of the involved
components must be included in the calculation. For details about calculating the PL for the entire safety function,
see EN ISO 13849-1 (listed in chapter
5 "Standards and certifications" on page 118
).
Device with 1 enable switch
Category 4 PL e can be achieved per EN ISO 13849-1:2015 by implementing the enabling device with 2 circuits,
suitable dynamic monitoring for short circuits and cross faults and ensuring the simultaneity of these circuits while
taking into account the actuation cycles with regard to the B
10d
value of the safety components.
Simultaneity monitoring by an external monitoring device is required since otherwise an accumulation of undetected
faults could occur that would lead to a loss of the safety function.
Device with 2 enable switches
The internal monitoring device cyclically tests the enabling electronics for short circuits and cross faults. In this
self-test, the enable signal is removed for the duration of the test pulse (max. 1 ms). Interferences in the enabling
electronics are detected and cause the enable signal to be canceled on the output.
Out Enable 01
Out Enable 02
t
t
t
Shift
t
Test
t
On
Disable
Figure 7: Enabling electronics - Testing for short circuits and cross faults
No external simultaneity monitor is required. It is recommended for detecting errors in the wiring, however.
2.2.2.3 Reasonably foreseeable misuse of the enable switch
"Reasonably foreseeable misuse" refers to the unauthorized use of other materials to hold the enable switch in the
enable position. This reasonably foreseeable misuse must be minimized.
Warning!
•
The enable switch is only suitable as a protective function if the person activating it is able to
recognize danger to personnel early enough to immediately take appropriate action to prevent
it! As an additional measure, reduced speed of the movement may be required. The permissible
speed must be determined by a risk assessment.
•
Using the enable switch by itself to issue commands that initiate dangerous states is not per-
mitted. A second intentional start command is required for this (key on control device).
•
The only person permitted in the danger zone is the person actuating the enable switch.
•
See chapter
"Standards and certifications" on page 118
for additional important information
regarding the enabling device.