
Operating Instructions
Chapter
4
UE 440/470
8 010 432/P097/14-03-05
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
43
Configurable functions
4.6.4
Discrepancy time
The discrepancy time t
dis
is the maximum time within which both inputs of a dual channel
connection may be found in impermissible states with dual channel connection without the
safety controller evaluating this as an error.
Monitoring of the discrepancy time starts with the first state change of the input. The
safety controller identifies an error If, after the discrepancy time has expired, both inputs
of the connection…
$
are not in equivalent (the same) states with equivalent circuit.
$
are not in complementary (opposite) states with complementary circuit.
In this case, the OSSDs of the safety controller are switched off and the error message
T
O
+
appears in the 7-segment display.
For the settable discrepancy time, refer to the Data sheet on Page 90.
Context menu device symbol UE 440/470, command
Edit configuration draft…
in
Edit
configuration draft
window, context menu element symbol of the sensor, command
Element wizard…
,
Input filter
tab.
The discrepancy time does not affect the OSSD response time.
Fig. 11: Discrepancy time
!
Note
Complementary circuit
Equivalent circuit
t
dis
t
dis
0
0
0
0
1
1
1
1
Channel 1
Channel 2