HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 47)

PROFIBUS IO data description
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5.9 Control word (G1_STW)
The control word controls the functionality of major encoder
functions.
Bit Function
0...7 Function requests: Reference mark search,
measurement on the fly
8..10 Reserved
11 Home position mode (absolute/relative)
12 Request set/shift of home position (Preset)
13 Request absolute value cyclically
14 Activate parking sensor
15 Acknowledging a sensor error
Table 18 G1_STW implementation requirements
Note: If the sensor parking is activated (bit 14=1) the device
is still on the bus with the slave sign of life active and
encoder error and diagnostics switched off.