Connection examples of safe inputs
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7 Connection examples of safe inputs
7.1
Explanation of the examples
The following examples describe the options for electrical connection of sensors to the safe
inputs. The examples do not represent a complete application.
Safety integrity of the
inputs
If the settings do not contradict one another, the inputs of a Smart Element can achieve dif
-
ferent safety integrity levels (SIL, SILCL, Cat., PL) simultaneously.
Error prevention is
assumed
Errors (e.g., cross-circuits, short circuits) that can be prevented by correct installation are
not described in the following examples. Correct installation includes, for example:
– Protected cable installation
– Isolated cable installation
– Double insulation
– Using ferrules
Error detection time
Please observe the error detection time.
See
“Error detection time” on page 23
.
Exceptions in the error detection time are indicated in the following tables.
Requirements on the
sensor
Observe the requirements of the standards with regard to the external wiring and the sen
-
sors to be used to achieve the desired safety integrity level.
Observe the technical data of the safe inputs when selecting the sensor.
See
“Safe digital inputs” on page 77
.