6Functions
38 Festo – GDCP-CMMP-M0-FW-E N – 1304NH
Single-turn encoder
Single-turn encoders supply a unique position o nly within one motor revolution (partial-absolute en-
coder). At commissioning, the encoder is c alibrated on the measuring reference system through hom-
ing and through zero po int 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 positio ning 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 star ted through the following methods.
A requirement in both cases is an active output stage and controller enable.
– Activat io n through the assigned digita l input “Start homing”
– Selec tion of the positioning record 0 and activation of the assigned digital input “position selec tor -
start”.
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