Installation manual
HB-37420-810-01-25F-EN SMX100 Installation manual.docx
Page 90 of 260
Version: 25F
4.2.2.2 General diagnostic measures for encoder interface
For fault detection in the sensor system the SMX 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
