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 chapter 7.3.1.
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 chapter 6.3.25).
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 chapter 6.3.26).
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‐
tus (see chapter 6.3.15) 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 chapter 6.3.24). 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
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