Using the SSI_Absolute_Encoder technology object
4.4 Configuring SSI_Absolute_Encoder
Counting, measurement and position detection
154 Function Manual, 12/2017, A5E32009889-AG
Example
In this example the SSI absolute encoder has the following specification:
● The encoder has a resolution of 17 bits per revolution and a value range of 11 bits of
revolutions. The SSI frame has a length of34 bits.
● The MSB of the position value is bit 33.
● The LSB of the position value is bit 6.
● The position value is Gray coded.
● The SSI frame has six special bits.
● A parity bit is available. A parity bit does not count in the frame length.
The frame has the following format:
Multiturn bit as Gray code
Singleturn bit as Gray code
If you configure "Complete SSI frame", the technology module returns the least significant 32
bits of the SSI frame as an unprocessed bit string. The technology module returns the bit
following the LSB as parity bit. In this example, the technology module therefore returns only
the least significant 31 bits of the SSI frame. With the complete SSI frame, you can evaluate
the additional special bits in your application.
The returned bit string is structured as follows:
Multiturn bit as Gray code
Singleturn bit as Gray code
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