SEW-Eurodrive MOVISAFE DCS B Series

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Manual – MOVIDRIVE® MDX61B Safety Module MOVISAFE® DCS..B Option
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 Comment 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 sub-
system of sensors
(incremental
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
relevant subsystem of
sensors for dynamic opera-
tion. Do not use for standstill
monitoring!
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 sub-
system of sensors for non-
dynamic operation. To be
used in particular for
standstill monitoring!
Monitoring of some sensor
characteristics (response time,
range of analog signals, such as
electrical resistance, capacitance)
60% Diagnostics of specific
sensor characteristics.
Only for use with velocity
and position sensors (see
chapter "Connecting posi-
tion and velocity sensors")
Monitoring of the single-
channel subsystem of single-
channel sensors.