
8 NCM S7 Diagnostics
A−201
S7-CPs for PROFIBUS Configuring and Commissioning
Release 09/2011
C79000−G8976−C181−05
Table 8-7 Checklist for Typical Problems in the DP Slave Mode
Problem Identifying the Cause and RemedyPossible Cause
No DP data are arriving at
the slave PROFIBUS CP
from the DP master or the
DP master is not receiving
data from the slave
PROFIBUS CP.
The I/O length specified in
the slave when DP-SEND
or DP-RECV is called
does not match the I/O
length configured on the
master.
Call up DP slave diagnostics in NCM S7
PROFIBUS Diagnostics.
PROFIBUS address of the DP parameter
assignment master: None
Slave station diagnostics:
StationNotReady
ExtDiagMessage
ParameterRequest
SlaveConfigCheckFault
StatusFromSlave
Plain language message “Slave waits for
parameters and configuration from master, Data
length changed.
Call up device-related diagnostics entry 02
XX YY
The entry 02 describes a configuration change
(see also Table LEERER MERKER on page
LEERER MERKER).
The entry XX indicates the currently specified
length (hexadecimal) of the DP-SEND for the
PROFIBUS CP as DP slave (corresponds to
the input data length to be configured for this
slave on the DP master).
The entry YY indicates the currently specified
length (hexadecimal) of the DP-RECV for the
PROFIBUS CP as DP slave (corresponds to
the output data length to be configured for this
slave on the DP master).
There is also a corresponding entry in the
diagnostic buffer: “Configuration accepted.
Receive length: aaa, Send length: bbb” where
aaa and bbb correspond to the parameters xx
and yy above in hexadecimal.
What to do:
Correct the configuration on the DP master or
length for DP-SEND or DP-RECV of the
PROFIBUS CP acting as DP slave.
The DP master is in the
CLEAR status
or
The error reaction
AUTOCLEAR is
configured on the DP
master and at least one of
the DP slaves configured
on the DP master is not in
the data transfer phase.
Call up DP slave diagnostics in NCM S7
PROFIBUS Diagnostics.
PROFIBUS address of the DP parameter
assignment master: XXX
Slave station diagnostics:
StatusFromSlave
Plain language message “DP master 1 is in the
CLEAR mode”.
What to do:
Change the DP master to the RUN mode and
eliminate the CLEAR mode.
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