Siemens ET 7Y Series Especificaciones Pagina 107

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Commissioning and Diagnostics
7-25
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
7.7 Diagnostic data of the electronic modules
7.7.1 Evaluating diagnostic data of the electronic modules in the user
program
In this section
This section describes the structure of the diagnostic data in the system data. You
must be familiar with this structure if you want to evaluate the diagnostic data of
the electronic modules in the STEP 7 user program.
The diagnostic data is located in the data records
The diagnostic data of a module can be up to 44 bytes in length and is located in
data records 0 and 1:
Data record 0 contains 4 bytes of diagnostic data describing the current status
of a programmable logic controller.
Data record 0 (DS0) is part of the header information of OB 82 (local data bytes
8 to 11).
Data record 1 contains the 4 bytes of diagnostic data that is also contained in
data record 0 and, in addition, up to 40 bytes of module-specific diagnostic
data.
You can read out data record 0 and data record 1 using the SFC 59 ”RD_REC”
and SFB 52 ”RDREC”.
More detailed information
A detailed description of the principles behind evaluating the diagnostic data of
electronic modules in the user program and a description the SFCs which can be
used for this purpose can be found in the STEP 7 manuals.
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