![Festo CMMP-AS-***-M3 Series Description Download Page 37](http://html1.mh-extra.com/html/festo/cmmp-as-m3-series/cmmp-as-m3-series_description_2283123037.webp)
6
Functions
Festo – GDCP-CMMP-M3-FW-EN – 1203NH
37
Single-turn
Single-turn encoders supply a unique position only within one motor revolution (partial-absolute en-
coder). At commissioning, the encoder is calibrated on the measuring reference system through hom-
ing and through zero point offset. Despite this, the absolute position is undefined after a RESET in most
cases (
>
1 revolution), that is, homing is fundamentally required after each switch-on.
You can permanently home the drive for specific applications (e.g. for modulo positioning 0 … 1 R), so
that the status “referenced” is automatically set at switch-on. Homing at switch-on can then be option-
ally eliminated, as with the multi-turn encoder.
6.2.5
Homing via I/O
Homing via I/O can be started through the following methods.
A requirement in both cases is an active output stage and controller enable.
–
Activation through the assigned digital input “reference start”
–
Selection of the positioning record 0 and activation of the assigned digital input “position selector -
start”.
Summary of Contents for CMMP-AS-***-M3 Series
Page 131: ......