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108928_en_02
7.3.3
External supply (OSSD)
Figure 7
-
8
2-channel equivalent assignment of the inputs,
external supply (OSSD)
Basic specifications
Typical parameterization
OSSD
+24 V
IN _C 1
0 H
IN _C 2
0 H
GND
WARNING: Loss of the safety function
Parasitic voltages can result in the loss of the safety function.
•
Connect sensor ground directly to terminal point GND on the Smart Element. An
external ground may not be used.
Sensor
2-channel OSSD output (with internal clocking)
Sensor supply
External (OSSD sensor)
Achievable
SIL/SILCL/Cat./PL
SIL 3/SILCL 3/Cat. 4/PL e
Parameterization
Parameterized as
Comment
Input xx, channel 1/channel 2
Assignment
Used, 2-channel equivalent
Mandatory setting
Filter time (t
Filter
)
3 ms
Application-specific
Symmetry
100 ms
Application-specific
Start inhibit due to symmetry
violation
Disabled
Application-specific
Cross-circuit monitoring
Disabled
Mandatory setting
Set the filter time for the input to a value greater than the width of the test pulse for the
OSSD sensor.
Cross-circuit detection must be disabled.