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.