
Diagnostic data of signal modules
B.2 Structure and contents of diagnostic data bytes 0 and 1
S7-400 Automation System Module Data
422 Reference Manual, Edition 09/2009, A5E00850736-06
B.2 Structure and contents of diagnostic data bytes 0 and 1
Overview
The section below describes the structure and content of the various bytes in diagnostic
data. General rule: When an error occurs, the bit concerned is set to "1".
Bytes 0 and 1
Table B- 1 Bytes 0 and 1 of diagnostic data
Byte Bit Meaning
7 Incorrect parameter in the module
6 No module parameters
5 Front connector missing
4 External auxiliary voltage missing
3 Channel error
2 External error
1 Internal error
Byte 0
0 Module error
7 0
6 0
5 0
4 Channel information available
3
2
1
Byte 1
0
Module type (see table "Codes of the module types")
Module types
The table below lists the module type IDs (bits 0 to 3 in byte 1).
Table B- 2 Codes of the module types
ID Module type
0101 Analog module
0110 CPU
1000 Function module
1100 CP
1111 Digital module
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