Technical data

IV.2 SSI-Interface, (only for units without a CONNECT module)
The SSI position output is available for servo-amplifiers which do not have a CONNECT module
(standard units). Set the ROD/SSI parameter to SSI by using either the operator software or the
operating keys.
The signal sequence can be output in Gray code (standard) or in Binary code. Set the SSI-
CODE parameter by using the operator software or the operating keys.
Operate the interface off an external supply voltage (GND : X5.1 and +5V : X5.8).
PGND must be connected to the control.
A serial signal is read out synchonously by the interface at a clock rate of max. 1.5 MHz. You
can adapt the servo-amplifier to the clock frequency of the SSI evaluation by using the SSI-
CLOCK parameter (200 kHz or 1.5MHz and reversed).
The position of the motor shaft is now calculated from the cyclically-absolute 14-bit information
of the resolver digital converter. A position output which is compatible to the usual data format
for normal commercial SSI absolute encoders is generated from this information. This synchro
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nous, serial, cyclically-absolute 12-bit information is output on the SubD connector X5.
24 bits are transmitted. The most significant 12 bits are permanently set to ZERO, the least si
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gnificant 12 bits contain the position output. The interface has to be read like a multi-turn enco
-
der, but supplies valid single-turn data.
SSI-Interface: connections and signal definitions:
The count direction for the SSI interface is set to be upwards for clockwise rotation, looking
along the motor axis. - A.4.011.3/5
Page IV - 2 Interfaces and options Chapter IV
01.98 - A.4.011.3/5 digifas™ 7100 series