Transferring The Diagnostic Data, Biss-C Interface - Balluff BML-S1G0-B7-M5E-0-S284 Serie Betriebsanleitung

BML-S1G0-B/S7_ _-M5E_-_0-(SA26-)S284
Absolute Magnetically Coded Position Measuring System
7
BEF diagnostics (continued)
7.3 Transferring the diagnostic data, BiSS-C
interface
Fig. 7-7 shows the relationships during diag value
transmission. Up to time t4, the transmission takes place
as described in sec. 6.2 on page 17. With the next
clock periods up to t5, as for SSI the diag value is
transmitted from the MSB to the LSB.
Then, a second CRC (DS-CRC = data safety CRC) takes
place over k clock periods, which includes the entire
payload from the MSB to the diag LSB (green range).
Clk
BiSS Data
ACK
t1
Fig. 7-7: BiSS signals (with additional safety value)
After the CRC has been verified in the controller between
t5 and t6, the same data as for the SSI can be prepared:
the position data, BEF value, error and warning status.
In this case, the CRC is not required from t3 to t4. It is only
transmitted for reasons of compatibility with the standard
BiSS interface.
If the controller only transmits clock impulses up to t4, the
received data is compatible with the standard BiSS-C
interface (see sec. 6.2 on page 17).
26 english
...Busy... Start CDS MSB
t2
CRC CRC Diag
LSB E W
MSB LSB MSB
t3 t4
CDM
t
Diag DS-CRC DS-CRC
t
m
LSB MSB LSB
t
t5 t6