Siemens Sinamics S110 Function Manual page 561

Encoder n control word (Gn_STW, n = 1, 2)
The encoder control word controls the encoder functions.
Table 9- 24 Description of the individual signals in Gn_STW
Bit Name
0 Find reference
mark or flying
1
measurement
2
3
4
5
6
7
8...12 Reserved
13 Request cyclic absolute value
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Functions If bit 7 = 0, then find reference mark request applies:
Bit Meaning
0 Function 1
1 Function 2
2 Function 3
3 Function 4
If bit 7 = 1, then find flying measurement request applies:
0 Function 1
1 Function 2
2 Function 3
3 Function 4
Note:
Bit x = 1

Bit x = 0
The following applies if more than 1 function is activated:

The values for all functions cannot be read until each activated function
has terminated and this has been confirmed in the corresponding status
bit (ZSW.0/.1/.2/.3 "0" signal again).
Find reference mark

It is possible to search for a reference mark.
Equivalent zero mark

Flying measurement
Positive and negative edge can be activated simultaneously.
Command Bit 6, 5, 4
(x: function selected via bit 0-3)
Mode 1 Flying measurement (fine resolution via p0418)
0 Find reference mark (fine resolution via p0418)
–
1 Request cyclic transmission of the absolute position actual value in
Gn_XIST2.
Used for (e.g.):


0 No request
9.2 Communication according to PROFIdrive
Signal status, description
Reference mark 1
Reference mark 2
Reference mark 3
Reference mark 4
Probe 1 rising edge
Probe 2 falling edge
Probe 3 rising edge
Probe 4 falling edge
Request function
Do not request function
Meaning
000 –
001 Activate function x
010 Read value x
011 Terminate function
Additional measuring system monitoring
Synchronization during ramp-up
Communication
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