Table 4-6 Leds Bf1 And Bf3; Table 4-7 Led Bf1 Illuminated; Table 4-8 Ed Bf1 Flashes - Siemens SIMATIC S7-300 Manual

Setting up an S7-300 with a Technology CPU
4.8 Status and error displays of the Technology CPU
Status and error displays for DP or DP(DRIVE)
Table 4-6 LEDs BF1 and BF3
LED
BF1 BF3
On/ flashes X
X On/ flashes
Description of status X:
The LED can assume the On or Off state. This status, however, is irrelevant for the current
CPU function. For example, the states Force On or Off do not influence the CPU STOP
status
Table 4-7 LED BF1 illuminated
Possible Errors
Bus fault (physical fault)
•
DP interface error
•
Different transmission rates in
•
multiple DP master mode.
If the DP slave / master interface is
•
active: Short-circuit on the bus.
With passive DP slave interface:
•
transmission rate search, i.e. there
are no other active nodes on the
bus (a master, for example)
Table 4-8 ED BF1 flashes
Possible Errors
The CPU is DP master / active slave:
Failure of a connected station
•
At least one of the configured
•
slaves cannot be accessed.
Incorrect configuration
•
The CPU is a DP slave
The CPU parameters are incorrectly
set. Possible causes:
The response monitoring period has
•
elapsed.
PROFIBUS DP communication is
•
down.
Wrong PROFIBUS address.
•
Incorrect configuration
•
4-8
Meaning
Error on the PROFIBUS DP interface of the Technology CPU.
Remedy: See table LED BF1 illuminated
Error on the DP(DRIVE) interface
LED BF1 flashing
Remedy: See table
CPU reaction
Call of OB 86 (when CPU is in RUN
mode). CPU switches to STOP if OB
86 is not loaded.
CPU reaction
Call of OB 86 (when CPU is in RUN
mode). CPU switches to STOP if OB
86 is not loaded.
Call of OB 86
(if CPU is in RUN mode).
CPU switches to STOP if OB 86 is not
loaded.
Possible Remedies
Check the bus cable for short-circuit
•
or breaks.
Evaluate the diagnostics.
•
Reconfigure or correct the
configuration.
Possible Remedies
Verify that the bus cable is connected
to the CPU, or that the bus is not
interrupted.
Wait until the CPU has completed its
startup. If the LED does not stop
flashing, check the DP slaves or
analyze the diagnostic data of the DP
slaves.
Check the CPU.
•
Verify that the bus connector is
•
properly seated.
Check whether the bus cable to the
•
DP master has been disconnected.
Check the configuration and
•
parameter assignment.
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02