Siemens Simatic S7-300 CPU 31xC Series User Manual

Debugging functions, diagnostics and troubleshooting
10.7 Diagnostics of DP CPUs
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
10-19
Diagnostic addresses for DP masters and DP slaves
At a CPU 31x-2, you assign diagnostic addresses for PROFIBUS DP. Verify in your
configuration that the DP diagnostic addresses are assigned once to the DP master and
once to the DP slave.
CPU 31x-2 as sender
CPU 31x-2 as receiver
PROFIBUS
Diagnostic address
Information on DP master
configuration
Information on DP slave
configuration
When you configure the DP master, assign two
different diagnostic addresses for an intelligent
slave, that is, one diagnostic address for slot 0,
and one for slot 2. Functions of those two
addresses:
• The diagnostic address for slot 0 reports in
the master all events relating to the entire
slave (station representative), for example,
node failure.
• The diagnostic address for slot 2 is used to
report events concerning this slot. For
example, if the CPU is acting as an intelligent
slave, it returns the diagnostic interrupts for
operating state transitions.
Hereinafter, these diagnostic addresses are
referred to as
assigned to the DP master .
These diagnostic addresses are used by the DP
master to obtain information about the status of
DP slave, or about bus interruptions.
When you configure the DP slave, you also
assign it a diagnostic address (in the associated
DP slave project).
Below, this diagnostic address is labeled
assigned to DP slave .
This diagnostic addresses is used by the DP
slave to obtain information on the status of the
DP master, or on bus interruptions.

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)