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Siemens SINEC L2 User Manual

Siemens SINEC L2
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S5-95U, SINEC L2 Start-Up, Tests, and Diagnostics
3.3.3 System Startup Diagnostics and Procedures
BF LED fault display
The BF (Bus Fault) LED lights up when
• the firmware of the S5-95U detects a fault, or
• if the communications processor integrated in the S5-95U is not activated.
Table 3-1. Interpretation of the BF LED Display
CauseBF LED
Lights up
Meaning
Corrected DB1 is
transferred to the PLC:
Communications
processor is not activated
SL2 parameter block in
DB1 contains errors
LAN bus fault (can only
occur if the S5-95U is
connected to the LAN)
Fatal internal fault or
basic parameters are not
consistent over the entire
network, e.g. TLN
(station address) has
been allocated twice
(LAN bus fault
Table 3-10)
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Communications
processor has been
assigned the wrong
parameters
PLC remains in STOP
mode
There is no SL2
parameter block in DB1
or it is enclosed by
comment characters (#)
after STOP-RUN or
POWER OFF - POWER
ON on the PLC
after POWER OFF -
POWER ON on the PLC
after POWER OFF -
POWER ON on the PLC
Note
If you start up the S5-95U with the default DB1, the communications processor will not
be activated and the BF LED will light up.
EWA 4NEB 812 6112-02
3-7

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Siemens SINEC L2 Specifications

General IconGeneral
BrandSiemens
ModelSINEC L2
CategoryController
LanguageEnglish

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