Using the SSI_Absolute_Encoder technology object
4.4 Configuring SSI_Absolute_Encoder
Counting, measurement and position detection
144 Function Manual, 12/2017, A5E32009889-AG
Bit number MSB of the position value
This parameter is used to specify the bit number of the MSB (most significant bit) of the
position value in the frame of the SSI absolute encoder. In this way you limit the range in the
frame that supplies the position value.
The value must be less than the frame length and higher than the bit number of the LSB of
the position value. The difference between the bit numbers of the MSB and the LSB of the
position value must be less than 31.
The default setting is "12".
Note
If you have selected the Code
type "Gray", only the range from the LSB to the MSB of the
position value is converted to binary code.
You can use this parameter to invert the values supplied by the SSIabsolute encoder. This
allows you to adapt the detected direction of the encoder to the motor's direction of rotation.
Note
This parameter acts only on the range from the LSB to the MSB of the position value in the
frame.
You can also set the following parameters in the graphic with drag-and-drop:
● Frame length
● Bit number LSB of the position value
● Bit number MSB of the position value
If the "Complete SSI frame" measured variable is selected, the module returns the least
significant 32 bits of the unprocessed current SSI frame. The graphic shows the
corresponding meaning of a supplied bit. The following abbreviations are used:
Value: Position value as gray or dual code
P Parity: Parity bit
When you have configured a parity bit, the module returns the least significant 31 bits of the
SSI frame
and
the parity bit.
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