
The
estimator_on
signal can be used to carry out a statistical analysis of the inci‐
dence of errors in the DSL system. For more information, please refer to
.
It should be noted that the POS flag and
estimator_on
signal information is redun‐
dant.
5.4.3
DEV_THR_ERR signal
dev_thr_err
is a DSL Master digital output.
If the fast position from the process data channel cannot be calculated (either due to
transmission or due to sensor errors), estimation is made by the DSL Master based on
the last two available position values of the Safe Channel. The worst case deviation
from the actual mechanical position is also provided, referring to a user- defined para‐
meter for the maximum possible acceleration in the application (fast position accelera‐
tion boundary, see
A threshold can be set up for a worst case deviation to raise the
dev_thr_err out-
put
. The threshold is a user defined parameter for the maximum tolerable deviation in
the application (fast position estimator deviation, see
).
dev_thr_err
indicates whether the maximum tolerable deviation is violated (‘1’) or
kept (‘0’).
5.4.4
SAFE_CHANNEL_ERR signal
safe_channel_err
is a DSL Master digital output.
The
safe_channel_err
signal is set if some event leads to the safe position or sta‐
) being invalid. Such events are:
•
A coding error in transmission of the safe position
•
A check-sum error in transmission of the safe position
The
safe_channel_err
signal can be used to carry out a statistical analysis of the
incidence of errors in the DSL system.
5.4.5
SAFE_POS_ERR signal
safe_pos_err
is a DSL Master digital output.
safe_pos_err
is a DSL Master digital output. The
safe_pos_err
signal is set if the
safe position of Safe Channel 1 is not updated or it has never been written since the
startup. Another possible cause can be the DSL motor feedback system reporting a
position error.
5.4.6
ACCELERATION_ERR signal
acceleration_err
is a DSL Master digital output.
The
acceleration_err
signal is set if an encoding error was detected after transmis‐
sion of a fast position value, or if the encoder has transmitted an invalid acceleration
cause of internal errors.
If the
acceleration_err
signal is set the error counter
acc_err_cnt
will be incre‐
mented with each transmission (see
). As soon as the
accelera-
tion_err
signal is reset the error counter
acc_err_cnt
will be set to “0” again.
5.4.7
ACC_THR_ERR signal
acc_thr_err
is a DSL Master digital output.
The
acc_thr_err
signal is set if the threshold programmed in register
acc_err_cnt
is exceeded.
INTERFACES
5
8017595/ZTW6/2018-01-15 | SICK
T E C H N I C A L I N F O R M A T I O N | HIPERFACE DSL
®
27
Subject to change without notice