
Operating Instructions
Chapter
7
UE 440/470
8 010 432/P097/14-03-05
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
69
Application and switching
examples
Application A
Single channel inputs
$
Reset
$
EDM
Dual channel inputs
$
C 4000 receiver
$
Emergency stop input device tested
$
Safety switch tested
EFI inputs
$
C 4000 receiver
$
S 3000
$
"Reset required" signal lamp
Single channel
outputs
$
Two test outputs for testing of single or dual channel inputs
(tests are offset by time for detection of cross-circuits)
Dual channel outputs
$
OSSD A
Marginal conditions
$
The OSSD is monitored for cross circuits.
$
The connection cables of the dual channel safety switches are
installed in separate sheathing lines or protected.
$
EDM and contactors are wired within the control cabinet.
$
The connection cables of the reset button are installed in
separate sheathing lines or protected.
Result
The UE 440 reaches a value of 17
)
% PFD at SIL 3 in application A
with the specified marginal conditions after 10 years.
Tab. 21: Failure probability
according to IEC 61 508 for
the example hazardous point
protection with interior area
protection
Fig. 47: Connection of the
hazardous point protection
with interior area protection