HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 52)

Alarms and warnings
52
6.3 Faults
If a fault occurs, the corresponding identifier is signaled in a
diagnostic telegram. Faults can be cleared after the sensor error is
acknowledged by the controller by setting bit 15 in the Control
word (G1_STW). A fault is only cleared when the functionality is
within the specification and the position value correct. A going
fault is indicated by a diagnostic telegram without the previously
sent fault.
Definition Error type
Position error 22
Memory error 24
Table 21 Faults
Error type: 22
Definition: Position value error
GSD entries:
Channel_Diag (22) = "Position value error"
Channel_Diag_Help (22) = The encoder has an internal error and is
not able to provide an accurate position value, change encoder"
Error type: 24
Definition: Memory error
GSD entries:
Channel_Diag (24) = "Memory error"
Channel_Diag_Help (24) = "The encoder has an internal error and
is not able to provide an accurate position value, change encoder"