
Chapter
4
Operating Instructions
UE 440/470
30
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8 010 432/P097/14-03-05
Configurable functions
4.2.9
Bypass
In some applications it is at times necessary to mute the OSSDs of the safety controller.
This could be the case, e.g. in a safe machine set-up mode, in which the machine can be
operated only in jog mode. When the bypass is active, the safety controller displays
,
green
and the 7-segment display shows
3
.
Switch on the machine safely when using the bypass function!
As long as the bypass function is active, the OSSDs do
not
switch the safety controller off
(except when an emergency stop assigned in the application is actuated). You must ensure
that other protective measures are activated during the bypass, e.g. the safe setup mode
of the machine in order that there is no danger to persons or parts of the machine during
the bypass.
The bypass function may only be activated by a key-operated switch with an automatic
reset and two levels or by two input signals that are independent of each other, e.g. two
position switches.
$
If you implement PSDI mode with a UE 470, you may not configure a bypass.
$
It must be possible to view the entire hazardous point when pressing the key-operated
switch for bypass.
$
It may not be possible to actuate the key-operated switch for bypass in the hazardous
area.
$
The bypass function is not in effect until the test signals for the key-operated switch for
bypass have been identified by the UE 440/470. This can lead to a delay of the bypass
function.
$
200 ms after switching off the bypass, the system is again in a safe status (latency time).
$
The safety controller ends bypass automatically if...
–
the operator changes the operating mode.
–
an emergency stop connected to the UE 440/470 and assigned to the application is
actuated.
–
the Lock-out operational status arises.
–
a teach-in procedure for a C 4000 connected via EFI is started via a Teach-in key-
operated switch connected to the UE 440/470
–
a teach-in procedure via a Teach-in key-operated switch connected to the C 4000 is
started at a C 4000 connected via EFI.
Fig. 5: Schematic layout of
the bypass function
%
ATTENTION
Notes
Bypass inactive
Bypass
active
%