Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 75 of 201
Version: 25F
4.3.2.2 Overview of DC in relation to selected diagnostic functions
Monitoring of outputs by one
channel without dynamic test
0-90% DC dependent on the
switching frequency
When using elements for
increasing the switching rating
(external relays or contactors),
only effective in conjunction
with readback function for the
switching contacts
Monitoring of
electromechanical,
pneumatic or hydraulic
actuators / outputs
Redundant shutdown path
with monitoring of one of the
drive elements
90% When using elements for
increasing the switching rating
(external relays or contactors),
only effective in conjunction
with readback function for the
switching contacts
Monitoring of outputs with
direct function as safety
circuit or
monitoring of safety circuits
with elements for increasing
the switching rating or
pneumatic/hydraulic control
valves in conjunction with
readback function for their
switching status
Cross comparison of output
signals with immediate and
intermediate results in the
logic (L) and program
execution monitoring in
relation to timing and logic,
and detection of static
failures and short-circuits
(with multiple inputs/outputs)
99% When using elements for
increasing the switching rating
(external relays or contactors),
only effective in conjunction
with readback function for the
switching contacts
For applications with frequent
demand for the safety
shutdown, testing should be at
short intervals, e.g. at the start
of the shift, 1 x per week.
However, a test should be
undertaken cyclically at least 1
x per year.
Monitoring of outputs with
direct function as safety
circuit or
monitoring of safety circuits
with elements for increasing
the switching rating or
pneumatic/hydraulic control
valves in conjunction with
readback function for their
switching status
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