Installation manual
PSC1-C-10 Installation manual V2.6
Page 53 of 173
Version: 57E
4.2.2.2
General diagnostic measures for encoder interface
For fault detection in the sensor system, a series of diagnostic measures are implemented in the PSC1
series depending on the encoder type selected and their combination. The measures are activated
automatically with the selection of the encoder type.
In principle, the diagnostic measures can be classified in relation to their nature and effectiveness as
per the table below:
Diagnostics for sensors for position and/or speed acquisition:
Measure
DC
Comment
Usage
Cross comparison of input
signals with immediate and
intermediate results in the logic
(L) and program execution
monitoring in relation to timing
and logic, and detection of
static failures and short-circuits
(with multiple inputs/outputs)
99
Only for usage on:
-
Dual-channel sensor
systems (2 separate
sensors),
-
the dual-channel sub-
system for single-channel
sensors (incremental
encoders)
-
Diagnostics for the single
and dual-channel sub-
system comprising
specially suited sensor
systems (SIN/COS
encoders) Dynamic
operation / no standstill
monitoring
Monitoring of 2-channel
sensor systems and the
related sub-system in
sensors for dynamic
operation
Not to be used for
standstill monitoring!
Cross monitoring of input
signals without dynamic test
80-
95%
DC is dependent on the
frequency of the dynamic
state, i.e. standstill or
movement and on the
quality of the monitoring
measure
(80 - 90% for incremental
encoders, 95% for SIN/COS
encoders)
Monitoring of dual-channel
sensor systems and the
related sub-system
comprising sensors for
non-dynamic operation.
To be used in particular for
standstill monitoring!
Monitoring some
characteristics of the sensor
(response time, range of analog
signals, e.g. electrical
resistance, capacitance)
60
Diagnostics of specific
features of sensors, can only
be used for speed and
position sensors according
to section 4.3
Monitoring of the single-
channel sub-system
comprising single-channel
sensor systems
