User Documentation
72714570000/01/12-2020
Notes on conguration
3.1 Lowdemandmodeof
operation
The safety relay is used with a low demand rate (low
demand mode) when the demand rate of the relay
does not exceed 1x per year.
The associated technical parameter is the value
PFD
avg
that applies to the duration of the test interval
T
proof
.
3.2 Typesofmalfunctions
A safe failure is not able to render a technical safety
system dangerous or non-functional. The safety re-
lay passes to a predened safe state.
A dangerous, undetected failure has the potential to
render a technical safety system dangerous or non-
functional. The safety relay does not pass to a pre-
dened safe state.
3.3 Testinterval
The test interval is the period of time in which tests
are conducted in full and are repeated.
Errors are detected within the framework of the
proof test.
3 Notes on conguration