Siemens Simatic S7-400 - Manual (Page 577)

Diagnostic Data of the Signal Modules
B-3
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
B.2 Structure and Contents of
Diagnostic Data Bytes 0 and 1
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
Byte 0
7 6 0
Module malfunction
Internal malfunction
External malfunction
There is a channel error
No external auxiliary supply
Front connector missing
Module not parameterized.
Incorrect parameter in the module
5 4 3 2 1
Byte 1
7 6 0
Channel information available
5 4 3 2 1
Module type (see Table B-1)
0 0 0
Figure B-1 Bytes 0 and 1 of the Diagnostic Data
Module Types
The following table contains the IDs of the module classes (bits 0 to 3 in byte 1).
Table B-1 Codes of the Module Types
Code Module Type
0101 Analog module
0110 CPU
1000 Function module
1100 CP
1111 Digital module