HEIDENHAIN PROFINET - Manual (Page 108)

Encoder state machine
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10.3.1 Preset depending on different telegrams
When using standard telegram 81-83, the acyclic encoder param-
eter 65000 Preset value 32 bit shall be used to set a preset value
(<=32 bit) for the encoder. If the acyclic encoder parameter 65002
Preset value 64 bit is used in this case, an error message will be
returned. With telegram 81-83 the operating status must be read
by encoder parameter 65001 Operating status 32 bit.
With telegram 84, the acyclic encoder parameter 65002 Preset
value 64 bit shall be used to set a preset value (<=64 bit) for the
encoder. If the acyclic encoder parameter 65000 Preset value 32
bit is used in this case, an error message will be returned. With
telegram 84 the operating status must be read by encoder pa-
rameter 65003 Operating status 64 bit.
10.3.2 Absolute preset with negative value
Preset data sent with acyclic encoder parameter 65000 or 65002
are signed values. The relative preset mode uses signed preset
values, but with the absolute preset mode no preset will be made
if a negative preset value (set with encoder parameter 65000 or
65002) is used while trying to initiate an absolute preset.
10.4 Error state
This state is reached when an error has occurred. The encoder
can enter this state from both the normal operation state and the
set/shift home position state. If an error occurs, the Status word
bit 15 Sensor error is set, and the error code is displayed in
G1_XIST2 instead of the position value.
10.5 Error acknowledgement
This state is reached when an error has occurred, and Control
word bit 15 Acknowledging a sensor error has been set. The Sta-
tus word bit 11 Requirement of error acknowledgment detected
and Status word bit 15 Sensor error are set to 1.
10.6 Start up
This state is only reached when Control word bit 14 Activate park-
ing sensor are cleared (=0). Once the Control word bit 14 are
cleared, it takes about 500ms before the Status word bit 14 Park-
ing sensor active are set to zero (=0).The reason for the delay is
that before the encoder goes to normal operation mode, an initial-
izing of the encoder is made.