Technical data

Table Of Contents
System Software for S7-300/400 System and Standard Functions - Volume 2/2
A5E00739858-01
32-1
32 Diagnostic Data
32.1 Overview of the Structure of Diagnostic Data
Data Record 0 and 1 of the System Data
The diagnostic data of a module are located in data records 0 and 1 of the system
data area (see Writing and Reading Data Records).
Data record 0 contains 4 bytes of diagnostic data that describe the current
status of a signal module.
Data record 1 contains
- The 4 bytes of diagnostic data, also located in data record 0 and
- The diagnostic data specific to the module.
Structure and Contents of the Diagnostic Data
This section describes the structure and contents of the individual bytes of the
diagnostic data.
Whenever an error occurs, the corresponding bit is set to "1."