PROFIBUS DP
5.1 CPU 41x-3 PN/DP as DP master / DP slave
S7-400 Automation System, CPU Specifications
5-20 Manual, 10/2006, 6ES7498-8AA04-8BA0
5.1.7 CPU 41x as DP slave: Station statuses 1 to 3
Station statuses 1 to 3
Station status 1 to 3 provides an overview of the status of a DP slave.
Table 5-14 Structure of station status 1 (Byte 0)
Bit Meaning Remedy
0 1:The DP slave cannot be addressed by the DP
master.
• Correct DP address set on the DP slave?
• Bus connector connected?
• Voltage at DP slave?
• RS-485 repeater set correctly?
• Execute reset on the DP slave
1 1:The DP slave is not yet ready for data exchange.
• Wait while the DP slave powers up.
2 1:The configuration data sent by the DP master to
the DP slave does not match the configuration of
the DP slave.
• Correct station type or correct configuration
of the DP slave entered in the software?
3 1:Diagnostic interrupt, triggered by RUN-STOP
change on the CPU
0:Diagnostic interrupt, triggered by STOP-RUN
change on the CPU
• You can read out the diagnostic
information.
4 1:Function is not supported, e.g. changing the DP
address via software
• Check the configuration.
5 0:The bit is always "0". –
6 1:The DP slave type does not correspond to the
software configuration.
• Correct station type entered in the
software? (Parameter assignment error)
7 1:Parameters have been assigned to the DP slave
by a different DP master to the one that currently
has access to the DP slave.
• The bit is always 1, for example, if you
access the DP slave with the programming
device or another DP master.
The DP address of the parameter assignment master is in
the "master PROFIBUS address" diagnostic byte.
Table 5-15 Structure of station status 2 (Byte 1)
Bit Meaning
0 1:The DP slave must be assigned new parameters and reconfigured.
1 1:There is a diagnostic message pending. The DP slave cannot continue until the problem has been eliminated
(static diagnostic message).
2 1:The bit is always set to "1" if the DP slave with this DP address is present.
3 1:Watchdog monitoring is enabled for this DP slave.
4 0:The bit is always set to "0".
5 0:The bit is always set to "0".
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