Device description / start-up
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03/04/2010 TR - ECE - BA - GB - 0009 - 08 Page 35 of 45
3.11 Optional SSI interface
The encoder has a separate Synchronous Serial Interface via which its position value
can be made available to a further evaluation unit (e.g. drive controller). The position
value output at this interface is identical to the value output on the PROFIBUS in
terms of conversion and code sequence. In order to use this interface, a special cover
with terminals for the SSI interface is necessary.
3.11.1 Limitation of SSI interface
The encoder position is re-loaded after each read process, and remains unchanged
until the next time it is accessed. If the SSI master (e.g. drive controller or WF
assembly) reads the position at prolonged or irregular intervals, this may lead to
contouring error messages.
To avoid this, the position should be read at short, regular intervals.
The monoflop time of the SSI interface is around 35 - 55 µs (typ. 41 µs) as opposed to
20 - 40 µs in the standard interface.
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