
8 NCM S7 Diagnostics
A−198
S7-CPs for PROFIBUS Configuring and Commissioning
Release 09/2011
C79000−G8976−C181−05
Table 8-6 Checklist for Typical Problems when Operating a DP Master in a System
Problem Identifying the Cause and RemedyPossible Cause
Slave stations are in the
STOP mode (for example
switch setting on the
ET200U-DP).
Call up DP master diagnostics in NCM S7
PROFIBUS diagnostics.
DP status RUN, cause of DP status normal
polling mode (with CPU user data).
Select the corresponding slaves in the slave
list.
Data transfer: No
Call up DP slave diagnostics for the
corresponding slaves in the slave list.
Slave station diagnostics: StationNonExistent
What to do:
Set the DP slave switches to the RUN mode.
PROFIBUS CP is acting
as master class 2 and
reads the input/output
data of the slave stations
cyclically.
Call up DP master diagnostics in NCM S7
PROFIBUS diagnostics.
DP status RUN, cause of DP status normal
polling mode (with CPU user data).
Select the corresponding slave in the slave list
Data transfer: No
Call up DP slave diagnostics for the
corresponding slaves in the slave list.
Slave station diagnostics: StationNotReady,
ExtStatusMessage, ParameterRequest,
SlaveDeactivated, StatusFromSlave
What to do:
Switch off the read service and switch on the
normal data transfer;
In other words, change to master 1 mode.
Outputs of the DP slaves
are zero although the user
program requires output
data not equal to zero.
Error reaction
AUTOCLEAR has been
configured and at least
one configured DP slave
is not in the data transfer
phase.
Call up DP master diagnostics in NCM S7
PROFIBUS diagnostics.
DP status Clear, cause of DP status at least
one (act.) slave not in the data transfer phase.
Search for the slave(s) in the slave list with data
transfer: No
Call up DP slave diagnostics for the
corresponding slaves in the slave list.
Analyze the DP slave diagnostics.
What to do:
Change the slave that is not in the data transfer
phase to the data transfer phase, for example
by correcting the configuration, RUN switch,
physical connection to the bus etc.
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