Installation manual
Page 41 of204
4.2.2.2 General diagnostic measures for encoder interface
For fault detection in the sensor system the PSCBR series has a number of diagnostic
measures implemented, depending on the chosen encoder type or its combination. These are
automatically activated when choosing the encoder type.
With respect to their type and effectiveness diagnostic measures can generally be classified
using the following table:
Diagnoses for sensors for position and/or speed detection:
Measure
DC
Note
Use
Cross-comparison of input
signals with immediate and
intermediate results in the logic
(L) and temporal as well as
logic program sequence
monitoring and detection of
static failures and short circuits
(for multiple inputs/outputs).
99
Only to be used for:
- dual-channel sensor
systems (2 separate
sensors),
- the dual channel partial
system of single
channel sensors
(incremental encoder)
- Diagnose for the single
and dual channel partial
system of specially
suitable sensor
systems (SIN/COS-
encoder, resolver)
- Dynamic operation / no
standstill monitoring
Monitoring of 2-channel
sensor systems or the
corresponding partial
system of sensors for
dynamic operation
Not to be used for
standstill monitoring!
Cross-comparison of input
signals without dynamic test
80-
95%
DC depends on the
frequency of the dynamic
condition, i.e. standstill
or movement, as well as
on the quality of the
monitoring measure
(80
– 90 % for
incremental encoder, 95
% for SIN/COS-encoder)
Monitoring of 2-channel
sensor systems or the
corresponding partial
system of sensors for
non-dynamic operation
To be used especially for
standstill monitoring!
Monitoring of some features of
the sensor (response time, the
area of analog signals, e.g.
electric resistance, capacity)
60
Diagnose of specific
features of sensors, only
to be used for speed and
position sensors as per
chapter 4.3.
Monitoring of the single-
channel partial system in
single-channel sensor
systems
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