Transferring The Diagnostic Data, Ssi Interface; Standard Ssi And Bef; Standard Ssi, Bef, And Error Bits - 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)
7.2

Transferring the diagnostic data, SSI interface

7.2.1

Standard SSI and BEF

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 sec. 6.1 on page 16). 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 exactness factor are determined in the
controller.
Clk
BiSS Data
E Null
t1
Fig. 7-5: SSI signals (position and BEF)
If the controller only transmits clock impulses up to t2, the
received data is compatible with the standard SSI interface
from sec. 6.1 on page 16.
7.2.2

Standard SSI, BEF, 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 sec. 8 on page 27.
Clk
BiSS Data
E Null
t1
Fig. 7-6: SSI signals with BEF 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
english
t
t
t
t
t
t
25