Balluff BML-S1G0-B7-M5E-0-S284 Serie Betriebsanleitung Seite 61

BML-S1G0-B/S7_ _-M5E_-_0-(SA26-)S284
Absolute Magnetically Coded Position Measuring System
7
BEF diagnostics (continued)
If the BEF number declines significantly anywhere in the
measuring range, the magnetic tape and sensor head
should be inspected at this position.
Error Possible cause
BEF number too Leaving the valid working range, gap
low over a range Z, offset Y, angle
Magnetic tape damaged
Magnetic or magnetizable material
nearby
Tab. 7-1: Possible causes/elimination for a lowered BEF number
The BEF number can be used as a set-up aid during
start-up or maintenance with the BAE PD-ML-010-03
(BAE00UN) Configuration Tool. In addition, the number can
be monitored permanently by the controller. Then, changes
to the system can be detected immediately (preventive
maintenance).
The BEF value is transferred in the diagnostic data with
4 bits of an 8-bit word (see Tab. 7-1).
Bit 7 Bit 6
Diag MSB
BEF3 BEF2
BEF MSB
BEF number
Tab. 7-2: Structure of the diagnostic data
These optional values are transferred via the SSI/BiSS-C
interface. Nevertheless, both interfaces are compatible
with the standard SSI interface and BiSS-C interface. The
controller can query and evaluate the value.
In the following, it has been assumed that n data bits and
8 diagnosis bits are transferred. The parameter n is defined
in the BML. With SSI, it can assume different values and is
selected via the order code.
24 english
Troubleshooting
Adjust the sensor head (see sec. 4 from page 8).
Exchange magnetic tape.
Note the restricted area for magnetizable material (see
sec. 4 from page 8). Identify and replace this material.
Bit 5 Bit 4
BEF1 BEF0
BEF LSB
Bit 3 Bit 2
X X
not relevant
Bit 1 Bit 0
Diag LSB
X X