2
02
0-
05
12
Functional Safety KFD2-SR2-Ex*.W(.LB)
Planning
3.3
Safety Function and Safe State
Safe State
In the safe state of the safety function the output is de-energized.
Safety Function for 1-channel Devices
KFD2-SR2-Ex1.W
KFD2-SR2-Ex1.W.LB
Safety Function for 2-channel Devices
KFD2-SR2-Ex2.W
S1 position I (normal
operation)
The safe state is reached if the NAMUR sensor input
is in the off state.
S1 position II (inverse
operation)
The safe state is reached if the NAMUR sensor input
is in the on state.
S1 position I (normal
operation)
The safe state is reached if the NAMUR sensor input
is in the off state.
S1 position II (inverse
operation)
The safe state is reached if the NAMUR sensor input
is in the on state.
S2 position I (output II as
signal output)
Output II has the same switching state like output I.
S2 position II (output II as fault
indication output)
LB/SC output
–
de-energized in case of fault.
Not for safety relevant application of output II.
S1 position I (normal
operation input channel I)
The safe state of output I is reached if the NAMUR sensor
input I is in the off state.
S1 position II (inverse
operation input channel I)
The safe state of output I is reached if the NAMUR sensor
input I is in the on state.
S2 position I (normal
operation input channel II)
The safe state of output II is reached if the NAMUR sensor
input II is in the off state.
S2 position II (inverse
operation input channel II)
The safe state of output II is reached if the NAMUR sensor
input II is in the on state.
