Diagnostics Of The Cpu 41X As Dp Master; Diagnostics Using Leds; Meaning Of The Busf Leds Of The Cpu 41X As Dp Master - Siemens SIMATIC S7-400H Manual

• Reconfiguration of I/O modules, e.g. selection of other interrupt limits
• Reversal of modifications: added modules, DP slaves and PA slaves (field
devices) can be removed.
4.9.3

Diagnostics of the CPU 41x as DP Master

Diagnostics Using LEDs

Table 4-6 explains the meaning of the BUSF LED.
The BUSF LED assigned to the interface configured as the PROFIBUS DP
interface will always light up or flash.
Table 4-6

Meaning of the BUSF LEDs of the CPU 41x as DP master

BUSF
Off Configuration correct
All the configured slaves are
addressable
•
Lights Bus fault (hardware fault)
•
DP interface fault
•
Different transmission rates in
multi–DP master operation (only in
single mode)
•
Flashes Station failure
•
At least one of the assigned slaves is
not addressable
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Meaning
Installation of a CPU 41x-H
What to Do
–
•
Check the bus cable for a short circuit or
interruption.
•
Evaluate the diagnosis. Reconfigure or correct
the configuration.
•
Check whether the bus cable is connected to
the CPU 41x or whether the bus is interrupted.
•
Wait until the CPU 41x has powered up. If the
LED does not stop flashing, check the DP
slaves or evaluate the diagnosis of the DP
slaves.
4-35