Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
303
Diagnostics data of the signal modules
A
A.1 Introduction
This appendix describes the structure of diagnostics data in system data. You need to know
this structure if you want to evaluate diagnostics data of fail-safe signal modules in the
default user program.
Additional references
For detailed information on the principle of the evaluation of diagnostics data of the modules
and of the corresponding supported SFCs, refer to the
System and Standard Functions
reference manual.
A.2 Structure and Content of Diagnostic Data
SFCs for reading diagnostics data
SFCs which can be used in the default user program to read diagnostics data from fail-safe
signal modules:
Table A- 1 SFCs for reading diagnostics data
SFC number Identifier Application
59 RD_REC Reading data records of S7 diagnostics (save to the data
section of the default user program)
13 DPNRM_DG Reading slave diagnostics data (save to the data section of
the default user program)
Position in the diagnostic message frame of slave diagnostics
If the fail-safe signal modules of ET 200M are operated in a distributed configuration and a
diagnostic interrupt occurs, data records 0 and 1 are entered in the slave diagnostics of ET
200M (= interrupt segment).
The position of the interrupt segment in slave diagnostics data depends on the structure of
the diagnostic message frame and on the length of channel-specific diagnostics.
A detailed description of the structure of the diagnostic message frame and the position of
the interrupt section in accordance with the PROFIBUS standard is available in the
Commissioning and Diagnostics
chapter of the "ET 200M Distributed I/O Device
(http://support.automation.siemens.com/WW/view/en/1142798
)" manual.
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