Debugging functions, diagnostics and troubleshooting
10.7 Diagnostics of DP CPUs
S7-300, CPU 31xC and CPU 31x: Installation
10-28 Operating Instructions, Edition 08/2004, A5E00105492-05
Station Status 1
Table 10-15 Structure of station status 1 (Byte 0)
Bit Meaning Remedy
0 1: DP slave cannot be addressed by DP master.
• Is the correct DP address set on the DP slave?
• Is the bus connector in place?
• Does the DP slave have power?
• Correct configuration of the RS485 Repeater?
• Perform a reset on the DP slave.
1 1: DP slave is not ready for data exchange.
• Wait for the slave to complete start-up.
2 1: Configuration data sent by DP master to the DP slave is
inconsistent with slave configuration.
• Was the software set for the correct station type or
DP slave configuration?
3 1: Diagnostic interrupt, generated by a STOP to RUN
transition on the CPU or by the SFB 75
0: Diagnostic interrupt, generated by a STOP to RUN
transition on the CPU or by the SFB 75
• You can read the diagnostic data.
4 1: Function not supported; e.g. changing the DP address at
software level
• Check configuration data.
5 0: This bit is always "0".
• -
6 1: DP slave type inconsistent with software configuration.
• Was the software set for the right station type?
(parameter assignment error)
7 1: DP slave was configured by a DP master other than the
master currently accessing the slave.
• The bit is always 1 if, for example, you are
currently accessing the DP slave via PG or a
different DP master.
The configuring master's DP address is located in the
"Master PROFIBUS Address" diagnostics byte.
Station Status 2
Table 10-16 Structure of station status 2 (Byte 1)
Bit Meaning
0 1: The DP slave requires new parameters and configuration.
1 1: A diagnostic message was received. The DP slave cannot resume operation until the error has been cleared
(static diagnostic message).
2 1: This bit is always "1" if a DP slave exists with this DP address.
3 1: The watchdog monitor is enabled on this DP slave.
4 1: DP slave has received control command "FREEZE".
5 1: DP slave has received control command "SYNC".
6 0: This bit is always "0."
7 1: DP slave is disabled, that is, it has been excluded from cyclic processing.
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