BBH SCU Series, Руководство по установке

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10
Safety-related characteristics
HB-37500-810-11-16F-EN SCU Installation Manual - Master and Slaves - SARC Page 116 of 303
Status: 09.06.2022
10.3.2.2. Overview DC with respect to the chosen diagnostic functions
Measure DC Note Use
Monitoring of outputs b
a channel without
dynamic test. 0-90% DC depending on switching
frequency
When using elements for
switching amplification
external relays or contactors)
only effective in connection
with the readback function of
the switching contacts
Monitoring of electro-
mechanical, pneumatic or
hydraulic actuators / outputs
Redundant cutout path
with monitoring one of
the drive elements
90% When using elements for
switching amplification
external relays or contactors)
only effective in connection
with the readback function of
the switching contacts
Monitoring of the outputs
with direct functions as safety
circuit or monitoring of safety
circuits with elements for
switching amplification of
pneumatic / hydraulic control
valves in connection with
readback functions from their
switching status
Cross-comparison of
input signals with
immediate and
intermediate results in
the logic (L) and
temporal as well as
logic program sequence
monitoring and
detection of static
failures and short
circuits (for multiple
inputs/outputs). 99% When using elements for
switching amplification
external relays or contactors)
only effective in connection
with the readback function of
the switching contacts
For applications with
frequent safety shut-down
requests these tests should
be performed more
frequently, e.g. at the
beginning of the shift, 1 x
per week. However, a test
should at least be carried out
cyclically 1 x year. Monitoring of the outputs
with direct functions as safety
circuit or monitoring of safety
circuits with elements for
switching amplification of
pneumatic / hydraulic control
valves in connection with
readback functions from their
switching status