
Chapter
4
Operating Instructions
UE 440/470
32
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8 010 432/P097/14-03-05
Configurable functions
4.2.10
Shutdown delay of output Out2
You can configure a shutdown delay for the
Out2
output of the Standard function module
in its element wizard. For the settable shutdown delay, refer to the Data sheet on Page 90.
If you connect output
Out2
to one of the OSSDs of the UE 440/470, you can switch off a
machine or system after a delay, for example. With this, you implement stop category 1
according to EN 418 for the assigned emergency stop (see Section 4.2.6 "Emergency stop"
on Page 25).
When determining the safety distance of the protective devices, take the response
times of the OSSDs into consideration!
The required safety distance of the protective device(s) which switch off the machine or
system via output
Out2
is increased due to the shutdown delay (see also Chapter 11.1
"Response times of OSSDs A and B" on Page 86).
If the criteria for shutting down during the time of the shutdown delay of output
Out2
are
no longer relevant (e.g. because the switching off condition is no longer valid, for example
in an application with interlock), the behaviour of the output
Out2
depends on the
configuration of the restart interlock:
$
If you have configured
an
internal restart interlock at the UE 440/470, the output
Out2
switches off after the shutdown delay has passed (for example through someone
entering the Protective Field or the switching of the operating mode), and the machine or
system stops. Shutdown of the machine or system can no longer be prevented.
$
If you have
not
configured an internal restart interlock at the UE 440/470, output
Out2
does not switch off, and the machine or system continues running. An entry into the
dangerous area must be avoided through additional safety measures. Additionally, take
care that the supervisory machine control acknowledges the command to switch off from
Out2.
Context menu device symbol UE 440/470, command
Edit configuration draft…
in
Edit
configuration draft
window, context menu element symbol
function module
, command
Element wizard…
,
Out2
tab.
4.2.11
Linking the input elements to logic modules
Using the logic modules, you can link the signals of the input elements (input devices and
sensors) with one another logically. In this way, it is possible to, for example, have ESPE
and several safety switches influence the OSSDs of the UE 440/470.
The following logic modules are available:
$
OR gate
$
AND gate
$
NAND gate
$
NOT gate
Never link safety-relevant input elements in such a way that their effectiveness is
compromised!
For example, do not generate OR links between safety switches which are to switch off the
OSSDs. Otherwise, both safety switches must have actuated to cause switch-off.
With inverted signal outputs, heed that a missing input condition such as lockout or a wire
breakage, leads the signal output to switch HIGH.
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ATTENTION
Note
!
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ATTENTION