Significance Of The "Bf", "Run" And "Stop" Leds Of The S5-95U - Siemens SIMATIC S5 Manual

Design and method of operation of the S5-95U with DP master interface
Significance of the
LEDs
Table 4-2 Significance of the "BF", "RUN" and "STOP" LEDs of the S5-95U
BF RUN STOP
LED LED
Off On Off
Flashes On Off
On Off On
Off On On
Off Off Flicker-
ing
4-4
The significance of the "BF", "RUN" and "STOP" LEDs is as follows:
Meaning
LED
All parameterized DP slaves are
addressable
At least one DP slave cannot be
addressed
Bus short-circuit or
terminating resistors missing or
parameterization error (invalid
HSA)
Power-up delay (see Section
8.2.2) or OB 21/OB 22
DP parameters being transferred
in S5-95U between control and
communication processors or
STEP 5 application program
being saved or read (Copy
button pressed)
Remedy
–
Check the DP slaves and analyze
the slave diagnostics.
Check the bus cable and the bus
configuration or
Check whether the DP master
receives the token (highest station
address not correct in the bus
parameters; the HSA is lower
than the station number of a DP
master).
After rectifying the error, switch
the power supply to the S5-95U
off and then on again.
–
–
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a