Pepperl+Fuchs DA6-SSI/A-U Manual page 25

DA6-SSI/A-U
5.4.3. Operation with Zero-Crossing
As a special advantage, the round-loop mode can be used to bypass the mechanical encoder
overflow position, because in this mode the unit continues with steady operation, even while
the SSI encoder signal passes the mechanical overflow position from maximum to zero.
This feature can help to avoid mechanical adjusting of the encoder zero position with many
applications, when no other means for the mechanical zero definition is available.
In general the Reset input will be used to define the zero position. The following picture
explains the details of operation.
8192
3500
o
0
0-PoS = 3500
Overflow suppression with a 13 bit SSI encoder
5.4.4. Splitting of SSI Encoder Information into Two Separate Displays
The Bit Blanking Function also allows to distribute one SSI telegram to two different SSI
indicator units. As a typical application the figure below shows how to separate the angular
information within one turn and the number of turns with a 16 x 16 Multiturn Encoder.
Multiturn SSI
16 + 16 = 32 Bit
IX34510a_e.doc / Apr-11
Original encoder signal
Display
r-LooP = 6000
Master: bits 17 - 32
(number of turns)
Parameters:
Bits = 32
HiBit = 32
LoBit = 17
Overow
Encoder: 13 Bit
Direction = 0
r-LooP = 6000
0-PoS = 3500
o
360 degrees
Slave: bits 01 - 16
(angular position)
Parameters:
Bits = 32
HiBit = 16
LoBit = 01
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