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

5.1.6

Diagnostics of the CPU 41x as DP slave

Diagnostics Using LEDs – CPU 41x
The following table explains the meaning of the BUSF LEDs. The BUSF LED assigned to the
interface configured as the PROFIBUS DP interface is always lit or flashing.
Table 5-8
BUSF
Off
Flashin
g
on
Detection of the Bus Topology in a DP Master System With the SFC103 "DP_TOPOL"
The diagnostic repeater is available to improve the ability to locate faulty modules or an
interruption on the DP cable when failures occur in ongoing operation. This module operates
as a slave and can identify the topology of a DP chain and record any faults originating from
it.
You can use SFC103 "DP_TOPOL" to trigger the identification of the bus topology of a DP
master system by the diagnostic repeater. For information on SFC103, refer to the
corresponding online help and to the
diagnostic repeater is described in the manual
Order Number 6ES7972-0AB00-8BA0.
STEP 5
Diagnostics with
The slave diagnostics complies with the EN 50170, Volume 2, PROFIBUS standard.
Depending on the DP master, diagnostic information can be read out with
for all DP slaves that comply with the standard.
The display and structure of the slave diagnostics is described in the following sections.
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
Meaning of the "BUSF" LEDs of the CPU 41x as DP slave
Meaning
Configuration correct
The parameter settings of the CPU 41x are
incorrect. There is no data exchange between
the DP master and the CPU 41x.
Causes:
The response monitoring
•
time has elapsed.
Bus communication over
•
PROFIBUS DP has been
interrupted.
The PROFIBUS address is
•
incorrect.
Bus short-circuit
•
STEP 7
or Slave Diagnostics
5.1 CPU 41x-3 PN/DP as DP master / DP slave
–
System and Standard Functions
Diagnostic Repeater for PROFIBUS DP
PROFIBUS DP
Remedy
Check the CPU 41x.
•
Check to make sure that
•
the bus connector is
properly inserted.
Check whether the bus
•
cable to the DP master
has been disconnected.
Check the configuration
•
and parameterization.
Check the bus
•
configuration
manual. The
,
STEP 5 STEP 7
or
5-15