Transferring The Diagnostic Data, Ssi Interface; Standard Ssi And Signal Quality; Standard Ssi, Signal Quality And Error Bits - Balluff BML-S1G0-7-M5EG-0 Serie Manual De Instrucciones

BML-S1G0-_7_ _-M5EG-_0-_ _
Absolute magnetic encoder system
7
Diagnose (continued)
7.2

Transferring the diagnostic data, SSI interface

These data are only sent after enabling the BML
Configuration Tool (see section 10.6). For this the value of
the BiSS SSI frame type must be set from Standard to
Diag.
The standard SSI interface is described in section 6.1.
7.2.1

Standard SSi and signal quality

Fig. 7-5 shows the time relationships for optional
diagnostic data transmission. The controller now outputs
n+8 clock periods instead of n clock periods up to t2, as
for standard SSI transmission. The BML transfers the
normal data between t1 and t2, beginning with the error
and the null, and then continuing with the MSB through to
the LSB (see section 6.1 auf Seite 19). With the 8
additional clock periods, the BML transfers the diagnostic
data, starting with the diag MSB through to the diag LSB.
After all data has been received in the controller at time t3,
the position value and signal quality are determined in the
controller.
Clk
SSI Data
E Null
t1
Fig. 7-5: SSI signals (position and signal quality)
If the controller only transmits clock impulses up to t2, the
received data is compatible with the standard SSI interface
from section 6.1 auf Seite 19.
7.2.2

Standard SSI, signal quality and error bits

If the control outputs 8 additional clock periods as in
Fig. 7-6 8 additional error bits are output following the 8
diagnosis bits, as per section 8 auf Seite 27.
Clk
SSI Data
E Null
t1
Fig. 7-6: SSI signals with signal quality and error bits
Up to time t2, the position is transmitted, up to t3 the 8-bit
diagnostic value, and up to t4 the error bits.
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Diag
MSB LSB
MSB
t2
MSB LSB
t2
Diag
t m
LSB
t3
Diag ERR ERR
t m
LSB MSB LSB
t3 t4
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t
t
t
t
t
t
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