Balluff BML-S1G0- 7 -M5EG- 0- Serie Betriebsanleitung Seite 62

BML-S1G0-_7_ _-M5EG-_0-_ _
Absolute magnetic encoder system
7
Diagnose (continued)
If the signal quality declines significantly anywhere in the
measuring range, the magnetic tape and sensor head
should be inspected at this position (mounting tolerances,
magnetizable material, see section 4.1.1).
Error Possible cause
Signal quality Leaving the valid working range,
over a range too gap Z, offset Y, angle
low
Magnetic tape damaged
Magnetic or magnetizable material
nearby
Tab. 7-1: Possible causes / fix for a diminished signal quality
The signal quality can be used as a setup aid during
startup or for maintenance work using the BML
Configuration Tool (see section 10.6 on page 32). In
addition, the number can be monitored permanently by the
controller. Then, changes to the system can be detected
immediately (preventive maintenance).
The signal quality is transferred in the diagnostic data using
4 bits of an 8-bit word (see Tab. 7-1).
Bit 7 Bit 6
Diag MSB
Signal quality
Bit 3 Bit 2
Signal quality
MSB
Tab. 7-2: Structure of the diagnostic data
These optional values are transferred via the SSI and
BiSS 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 starting page 9).
Exchange magnetic tape.
Note the restricted area for magnetizable material (see section 4
starting page 9). Identify and replace this material.
Diagnostic data
Bit 5 Bit 4
Bit 1 Bit 0
Signal quality
LSB
Bit 3 Bit 2
not relevant
X X
Bit 1 Bit 0
Diag LSB
X X