Examples Of The Frame Format - Siemens SIMATIC ST-1500 Function Manual

4.4.7

Examples of the frame format

Example 1
In this example the SSI absolute encoder has the following specification:
● The encoder has a resolution of 13 bits per revolution and a value range of 12 bits of
revolutions. The SSI frame has a length of 25 bits.
● The MSB of the position value is bit 24.
● The LSB of the position value is bit 0.
● The position value is Gray coded.
● A parity bit is not available.
The frame has the following format:
MG
SG
Complete SSI frame
If you configure "Complete SSI frame", the technology module returns the unprocessed SSI
frame in the return interface right-justified:
MG Multiturn bit as Gray code
SG Singleturn bit as Gray code
Position value feedback value
The position value supplied in Gray code is converted into binary code by the technology
module and returned right-justified in the feedback interface:
MD Multiturn bit as binary code
SD Singleturn bit as binary code
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
Multiturn bit as Gray code
Singleturn bit as Gray code
Using the SSI_Absolute_Encoder technology object
4.4 Configuring SSI_Absolute_Encoder
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