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SMRA - SSI and BiSS
8 - Error and fault diagnostics
At power on or during operation the following errors may occur:

when switching on the system an alarm is triggered through both the
diagnostic LED and the dedicated bit (SSI interface: refer to the section “5.4
Error bit” on page 20; BiSS interface: refer to the section “Error (nE)” on
page 24): the ring is not read correctly; it may be due to one of the
following reasons: the ring and/or the sensor are not mounted properly (see
the section “3 - Mounting instructions” on page 11); the ring magnetic
surface is damaged somewhere; the sensor is not working properly; this may
cause invalid data to be transmitted; as soon as the problem is solved the
LED switches off and the error bit switches to high logic level;

during operation an alarm is triggered through both the diagnostic LED and
the dedicated bit (SSI interface: refer to the section “5.4 Error bit” on page
20; BiSS interface: refer to the section “Error (nE)” on page 24): as previously
stated, the ring is not read correctly; it may be due to one of the following
reasons: the ring and/or the sensor are not mounted properly (see the
section “3 - Mounting instructions” on page 11); the ring magnetic surface
is damaged somewhere; the sensor is not working properly; furthermore,
the alarm may be caused by a position calculation error so that the resulting
position value is invalid. The last valid position is “frozen” (kept in memory)
until the next valid position is detected on the ring.
NOTE
In the SSI interface, the device status is both shown visually through the
diagnostic LED (see the section “7 - Diagnostic LED” on page 33) and
transmitted via the error bit (see the section “5.4 Error bit” on page 20).
In the BiSS interface, the device status is both shown visually through the
diagnostic LED (see the section “7 - Diagnostic LED” on page 33) and
transmitted via the error bit (see the section “Error (nE)” on page 24). Refer also
to the section “Warning (nW)” on page 24.
For any further information refer also to the section “10 - Troubleshooting” on
page 36.
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