Manual – MOVIDRIVE® MDX61B Safety Module MOVISAFE® DCS..B Option
141
12
Diagnostic values
Appendix
12.5.2 Binary outputs
General assessment of the diagnostics coverage (DC) for binary outputs according to EN ISO 13849-1.
INFORMATION
• For a safety assessment of the output subsystem when using external elements in
the switch-off circuit, e.g. for switching amplification, the manufacturer's specifica-
tion (MTTF
d
, FIT values, B
10d
value, etc.) must be used.
• The DC values listed in the table should be applied conservatively to ensure
compliance with the boundary conditions ("Comment" column).
• Fault exclusions are permitted according to the relevant standards. The specified
boundary conditions must be permanently ensured.
• When using elements to amplify signals in safety circuits, the the function of these
elements must be monitored using suitable feedback contacts, etc. (see wiring
examples). Suitable feedback contacts are contacts that are connected with the
contacts in the cut-off circuit in a forced-switching manner.
Measure DC
value
Comment Use
Cross comparison of output
signals and intermediate results in
the logic (L) and temporal monitor-
ing of the logical program run as
well as detection of static failures
and short circuits (with multiple
inputs/outputs).
99% When using elements to
amplify switching (exter-
nal relays or contactors),
the measure is only
effective together with the
feedback function of
switch contacts (EMU
function).
Monitoring of outputs with
direct function as safety
circuit, or monitoring of safety
circuits with elements to
amplify switching in conjunc-
tion with feedback function of
their outputs.
To Next Page
Loading...