Diagnostics Of The Cpu 41X As Dp Master - Siemens SIMATIC S7-400 Reference Manual

1.11.4

Diagnostics of the CPU 41x as DP Master

Diagnostics Using LEDs
Table 1-7 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 1-7 Meaning of the BUSF LED 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
•
Flashing Station failure
•
At least one of the assigned slaves is
not addressable
Flashes CiR synchronization running
briefly
INTF lights up
briefly
Triggering Detection of the Bus Topology in a DP Master System with the SFC 103
"DP_TOPOL"
The diagnostics repeater is provided to improve the ability to locate disrupted
modules or an interruption on the DP cables when failures occur in ongoing
operation. This module operates as a slave and can determine the topology of a
DP strand and record any faults originating from it.
You can use SFC 103 "DP_TOPOL" to trigger the analysis of the bus topology of a
DP master systems by the diagnostics repeater. SFC 103 is documented in the
corresponding online help and in the manual "System and Standard Functions".
The diagnostics repeater is documented in the manual "Diagnostics Repeater for
PROFIBUS DP", order number 6ES7 972-0AB00-8BA0.
Automation System S7-400 CPU Specifications
A5E00165965-01
Meaning
Structure of a CPU 41x
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.
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