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6.3
DP Diagnostic Message Using the Example of an
IM 308-C with FB IM308C
Introduction
Choice of
Diagnosis
Master Diagnosis
Slave Diagnosis
FB IM308C
Exchanging
Diagnostic Data
Procedure
Communications Processor CP 541
EWA 4NEB 812 6188-02
The DB diagnostic message is structured to Standard DIN E 19245, Part 3,
and provides information on the DP slave or CP 541.
Two diagnostic facilities are available:
Master diagnosis as an overview diagnosis
Slave diagnosis as a secondary diagnosis
In the master diagnosis, an overview diagnosis is contained in the first 16
bytes. From the overview diagnosis, you can take the DP slaves which have
reported a diagnosis or which cannot be addressed from this DP master.
The overview diagnosis is particularly recommended when you have two or
more DP slaves. Since you are using the master diagnosis, you need not re-
quest the slave diagnosis from each DP slave.
Contained in the slave diagnosis is all diagnostic information for a particular
DP slave.
The structure of the slave diagnosis is explained in Section 6.3.1
You can read the CP 541 diagnosis into your programmable controller, such
as SIMATIC S5, as a so-called slave diagnosis, with function block IM308C
(FB192) for example, with IM 308-C.
A detailed description of FB IM308C is given in the manual: ET 200 Distri-
buted I/O System.
The CP 541 informs the DP master of a diagnosis via high-priority sending of
the useful data. The DP master then automatically requests the diagnostic
message from the CP 541.
The procedure for reading the diagnosis into your programmable controller
with FB IM308C is described in detail in the manual: ET 200 Distributed I/O
System.
An example of a diagnostic call for the slave diagnosis is given in Section
6.3.4.
Diagnostics and Error Handling
6-13
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