Siemens Simatic S7-400 User Manual

PROFIBUS DP
5.1 CPU 41x-3 PN/DP as DP master / DP slave
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
5-15
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 Meaning of the "BUSF" LEDs of the CPU 41x as DP slave
BUSF Meaning Remedy
Off Configuration correct –
Flashin
g
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.
• 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.
on
• Bus short-circuit • Check the bus
configuration
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
System and Standard Functions manual. The
diagnostic repeater is described in the manual
Diagnostic Repeater for PROFIBUS DP ,
Order Number 6ES7972-0AB00-8BA0.
Diagnostics with STEP 5 or STEP 7 Slave Diagnostics
The slave diagnostics complies with the EN 50170, Volume 2, PROFIBUS standard.
Depending on the DP master, diagnostic information can be read out with
STEP 5 or STEP 7
for all DP slaves that comply with the standard.
The display and structure of the slave diagnostics is described in the following sections.

Siemens Simatic S7-400 Specifications

General

Brand	Siemens
Model	Simatic S7-400
Category	Controller
Language	English