HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 76 of 189
Version: 50F
4.3.2.2 Overview of DC in relation to selected diagnostic functions
Monitoring of outputs by one
channel without dynamic test
DC dependent on the
switching frequency
On the usage of 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
On the usage of 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)
On the usage of 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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