67
67
No. Description
Notes and measures
1) The feed back circuit on Y1-Y2 is not closed when safety relays
8
Failure on
are de-energised.(the feed back loop must close 50 ms after the
relay outputs
relays de-energise
2) One of the output relays or it’s control circuit is defective,
the unit must be repaired.
9
Output failure
In one channel it was detected that the required position of the
output contacts are not identically
10 Software failure
A processor detected a failure
in it’s own routine
11 Simultaneity
It takes to long until both hardware channels
failure
get the same state
System failures in safety operation
No. Description
Notes and measures
1) The feed back circuit on Y1-Y2 is not closed when safety relays
8
Failure on
are de-energised.(the feed back loop must close 50 ms after the
relay outputs
relays de-energise
2) One of the output relays or it’s control circuit is defective,
the unit must be repaired.
9
Output failure
In one channel it was detected that the required position of the
output contacts are not identically
10 Software failure
A processor detected a failure
in it’s own routine
11 Simultaneity
It takes to long until both hardware channels
failure
get the same state
System failures in safety operation
Summary of Contents for BI 5910
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