9 Interfaces
Installation manual for PMC tendo DD5/PMCprimo Drive3 Page 65
9.8.2 SSI output (X5)
The SSI interface (synchronous serial absolute-encoder emulation) is part of the standard
package. Select encoder function SSI (“Encoder” screen page). The servo amplifier calculates
the motor shaft position from the cyclic-absolute signals of the resolver or encoder. From this
information a SSI date (Stegmann patent specification DE 3445617C2) is provided. Max 32 bits
are transferred. The leading data bit contains the number of revolutions and are selectable from
12 to 16 bits. The following max. 16 bits contain the resolution and are not variable.
The following table shows the allocation of the SSI date depending upon selected number of
revolutions:
Resolution Resolution (variable)
SSIREVOL
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
13 12 11 10 9 8 7 6 5 4 3 2 1 0
12 11 10 9 8 7 6 5 4 3 2 1 0
Bit
11 10 9 8 7 6 5 4 3 2 1 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
The signal sequence can be output in Gray code or in Binary (standard) code.
The servo amplifier can be adjusted to the clock frequency of your SSI-evaluation with the
setup software PDrive (cycle time 1,3 µs or 10 µs).
The drivers operate off an internal supply voltage.
9.8.2.1 Connection and signals for the SSI interface
Default count direction: UP when the motor shaft is rotating clockwise (looking at the end of the
motor shaft).
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