Structure And Contents Of Diagnostic Data Bytes 0 And 1 - Siemens SIMATIC S7-400 Reference Manual

Diagnostic data of signal modules
B.2 Structure and contents of diagnostic data bytes 0 and 1
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
Byte
Byte 0
Byte 1
Module types
The table below lists the module type IDs (bits 0 to 3 in byte 1).
Table B-2
406
Bytes 0 and 1 of diagnostic data
Bit
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
0 Module error
7 0
6 0
5 0
4 Channel information available
3
Module type (see table "Codes of the module types")
2
1
0
Codes of the module types
ID
0101
0110
1000
1100
1111
Meaning
Module type
Analog module
CPU
Function module
CP
Digital module
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08