SSI
93
AMS 304
i
Leuze electronic
10.1.1
SSI sequence diagram
Figure 10.1: SSI data transmission sequence diagram
Notice!
In the default setting the
LSB
bit is the error bit.
Attention!
Significance of the error bit
:
By default a 25th error bit (LSB) is appended to the 24-bit measurement value.
The error bit is not included in the Gray coding of the measurement value.
The error bit is 1 = active, 0 = not active.
Notice!
The data can be read out with a clock rate between 80 kHz and 800 kHz.
Attention!
Updating the measurement values on the SSI interface of the
AMS 304
i
:
The measurement value on the SSI interface of the AMS 304
i
is updated every 1.7 ms
(default) independent of the clock frequency.
The update rate on the interface can be reduced to 0.2 ms via the display under the SSI menu
item or in PROFIBUS module 17.
The shorter update rate is only valid for the SSI interface and has no influence on the
PROFIBUS DP interface.
Clock sequence
Complete transmission cycle