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108928_en_02
7.2.3
Supply through OSSD
Figure 7
-
4
1-channel assignment of inputs: external supply (OSSD)
Basic specifications
Typical parameterization
OSSD
OSSD sensor
OSSD
+24 V
IN _C 1
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
1-channel OSSD output (with internal clocking)
Sensor supply
External (OSSD sensor)
Achievable
SIL/SILCL/Cat./PL
SIL 2/SILCL 2/Cat. 2/PL d
WARNING: Loss of the safety function
Cross-circuits can result in the loss of the safety function.
•
Prevent cross-circuits to achieve the specified PL.
Parameterization
Parameterized as/value range
Comment
Input xx, channel 1/channel 2
Assignment
Used, 1-channel both
Mandatory setting
Filter time (t
Filter
)
3 ms
Application-specific
Symmetry
Disabled
Mandatory setting
Start inhibit due to symmetry
violation
Disabled
Mandatory setting
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.
The input must be parameterized without cross-circuit monitoring.