Encoders
11.3 Absolute encoder
FM 352 electronic cam controller
142 Operating Instructions, 05/2011, A5E01071724-03
Listen in
"Listen in" means: an absolute encoder is operated in parallel on two modules (for example,
FM 351 and FM 352). The FM 351 positioning module is the master and the clocks the
absolute encoder, and the FM 352 electronic cam controller is the slave and listens in to the
signals of the SSI frame.
Set "Increments/Encoder Revolution" and "Number of Revolutions" to the master setting.
The baud rate is irrelevant. Depending on the encoder type select "Listen in" or "Listen in
Right-Justified" for "Frame Length".
Wiring Listen in
The diagram below is based on the example of an FM 351 and FM 352, and shows how to
wire the absolute encoder so that the FM 352 listens.
&/6
'$7
&/,
&/,
'$7
'$7
'$7
&/6
9
$EVROXWHHQFRGHU
%URZQ*URXQG
)0OLVWHQVLQ
)0DVDVODYH )0DVDPDVWHU
:KLWH
*UD\
3LQN
6KLHOGRQ
HQFORVXUH
7ZLVWHGSDLUFDEOHV
&RQQHFWWRPDVWHUHQFRGHU
LQWHUIDFH
6KLHOGRQ
HQFORVXUH
6KLHOGRQ
HQFORVXUH
*UHHQ
<HOORZ
%OXH
5HG
Figure 11-3 Connection of absolute encoders (SSI)
Note
If you want the FM 352 to listen in, you must connect the ground (M) of the encoder supply
of the master (for example, FM 351: front connector, pin 2) and of the slave module (FM 352:
front connector, pin 2) to the ground of the CPU with low resistance.
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