Diagnostics Of The Cpu 41X As Dp Slave; Meaning Of The Busf Leds Of The Cpu 41X As Dp Slave - Siemens SIMATIC S7-400 Reference Manual

1.11.6

Diagnostics of the CPU 41x as DP Slave

Diagnostics using LEDs – CPU 41x
Table 1-11 explains the meaning of the BUSF LEDs.
The BUSF LED assigned to the interface configured as the PROFIBUS DP
interface will always light up or flash.
Table 1-11 Meaning of the BUSF LEDs of the CPU 41x as DP Slave
BUSF
Off Configuration correct
Flashing The CPU 41x is incorrectly configured.
There is no data interchange between
the DP master and the CPU 41x.
Causes:
• •
The response monitoring time has
expired.
•
Bus communication via
PROFIBUS DP has been interrupted.
•
The PROFIBUS address is incorrect.
• •
On Bus short circuit
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.
Diagnostics with STEP 5 or STEP 7 Slave Diagnostics
The slave diagnosis complies with the EN 50170, Volume 2, PROFIBUS standard.
Depending on the DP master, it 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 diagnosis is described in the following
sections.
Automation System S7-400 CPU Specifications
A5E00165965-01
Meaning What to Do
–
•
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 interrupted.
•
Check the configuration and parameter
assignment.
• •
Check the bus setup.
Structure of a CPU 41x
1-51