Manual – MOVIDRIVE® MDX61B Safety Module Option MOVISAFE® DCS..B
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12
Diagnostic values
Appendix
12.5.3 Encoder interface
General assessment of the diagnostics coverage (DC) for sensors for position and/or
velocity detection according to EN ISO 13849-1.
Measure DC value Remark Use
Cross comparison of input signals
and intermediate results in the
logic (L) and temporal monitoring
of the logical program run as well
as detection of static failures and
short circuits (with multiple
inputs/outputs).
99% Use only for:
• Two-channel sensor
systems (2 separate
sensors)
• Dual-channel subsys-
tem of sensors (incre-
mental encoders)
• Diagnostics for the
single- and dual-
channel subsystem of
specifically suited
sensor systems
(SIN/COS encoders,
Resolvers)
• Dynamic opera-
tion/no standstill
monitoring
Monitoring of dual-channel
sensor systems or the rele-
vant subsystem of sensors
for dynamic operation. Do
not use for standstill monitor-
ing.
Cross comparison of input signals
without dynamic test.
60 – 99% The DC value depends
on the following factors:
frequency of the dynamic
state, which is standstill
or movement, and the
quality of the monitoring
measure (60 – 90% for
incremental encoders,
95 – 99% for SIN/COS
encoders)
Monitoring of dual-channel
sensor systems or subsys-
tem of sensors for non-
dynamic operation. To be
used in particular for stand-
still monitoring.
Monitoring of some sensor char-
acteristics (response time, range
of analog signals, such as electri-
cal resistance, capacitance)
60% Diagnostics of specific
sensor characteristics.
Only for use with velocity
and position sensors (see
chapter "Connecting posi-
tion and velocity sen-
sors")
Monitoring of the single-
channel subsystem of single-
channel sensors.
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