X20 system modules • Counter modules • X20DC1176
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X20 system User's Manual 3.10
Manual acknowledgment of latched error states
The latched error states of the signal lines from the encoder can be acknowledged manually. However, if there
are still pending errors remaining, then the error status remains active. After successfully acknowledging the errors
(latched error status = 0), the acknowledge bits must still be reset by the user or else a re-occurrence of an error
could be overlooked by the user.
Cause of error corrected before being acknowledged
Example 1:
An error has occurred on a signal line. The error state is detected and latched by the module.
The error is acknowledged by the user after the cause of error has been corrected. The latched
error status changes to zero.
The manual acknowledge must now be reset so that any new errors will be recognized by the
user.
Error on signal line
Latched error state
Manual acknowledgment
Latched error state = 0
⇒ Reset manual acknowledgment
t
t
t
Figure 261: Cause of error corrected before being acknowledged
Cause of error not yet corrected before being acknowledged
Example 2:
An error has occurred on a signal line. The error state is detected and latched by the module.
The error is acknowledged by the user before the cause of error has been corrected. The latched
error status remains set because the error is still remaining.
Acknowledgment is only successful after the cause of error has been corrected. The latched
error status changes to zero. The manual acknowledge must now be reset so that any new errors
will be recognized by the user.
Error on signal line
Latched error state
Manual acknowledgment
Latched error state = 0
⇒ Reset manual acknowledgment
t
t
t
Figure 262: Cause of error not yet corrected before being acknowledged
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