B.2 Structure And Content Of Diagnostic Data Bytes 0 To 7 - Siemens SIMATIC S7-300 Reference Manual

B.2 Structure and Content of Diagnostic Data Bytes 0 to 7
The structure and contents of the different bytes of the diagnostic data are
described below. The following general rule applies: When an error occurs, the bit
concerned is set to "1".
Bytes 0 and 1
Figure B-1
Module types
The following table contains the IDs of the module classes (bits 0 to 3 in byte 1).
Table B-1
B-2
7 6 5 4 3 2 1
Byte 0
Channel error present
External auxiliary supply missing
Front connector missing
Module not parameterized.
Incorrect parameter in the module
7 6 5 4 3 2 1
Byte 1
0 0
Channel information available
User information available
Bytes 0 and 1 of the Diagnostic Data
Codes of the Module Types
Code
0101
0110
1000
1100
1111
0
Module problem
Internal malfunction
External malfunction
0
Module type (see Table B-1)
Module Type
Analog module
CPU
Function module
CP
Digital module
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03