Functional Safety HiC284*
Planning
20
20
-0
7
11
3.3
Safety Function and Safe State
Safe State
The safe state is the de-energized state of the outputs Iand II.
Safety Function
HiC2841
•
For output I:
•
Switch S1 in position II (normal operation)
In this case the safety function is defined as
output I is de-energized
,
if the
input I is in de-energized state
.
•
Switch S1 in position I (inverse operation)
In this case the safety function is defined as
output I is de-energized
,
if the
input I is in conducting state
.
•
For output II:
•
Switch S3 in position I (output II follows output I)
Output II follows output I. The safety function is the same as for output I.
•
Switch S3 in position II (output II assigned to line fault detection)
Output II is not part of the safety function.
HiC2842
•
For channel I:
•
Switch S1 in position II (normal operation)
In this case the safety function is defined as
output I is de-energized
,
if the
input I is in de-energized state
.
•
Switch S1 in position I (inverse operation)
In this case the safety function is defined as
output I is de-energized
,
if the
input I is in conducting state
.
•
For channel II:
•
Switch S3 in position II (normal operation)
In this case the safety function is defined as
output II is de-energized
,
if the
input II is in de-energized state
.
•
Switch S3 in position I (inverse operation)
In this case the safety function is defined as
output II is de-energized
,
if the
input II is in conducting state
