Technical data

Table Of Contents
System Software for S7-300/400 System and Standard Functions - Volume 2/2
A5E00739858-01
34-1
34 Events
34.1 Events and Event ID
Event
All events are numbered within the SIMATIC S7 programmable logic controller.
This allows you to relate a message text to an event.
Event ID
An event ID is assigned to every event. The event ID is structured as follows:
1214 1315 8
10
9
11
46570213
Event Class IDs Event Number
Structure of the Event ID.
Event Class
The event classes are as follows:
Number Event Class
1 Standard OB events
2 Synchronous errors
3 Asynchronous errors
4 Mode transitions
5 Run-time events
6 Communication events
7 Events for fail-safe and fault-tolerant systems
8 Standardized diagnostic data on modules
9 Predefined user events
A, B Freely definable events
C , D, E Reserved
F Events for modules other than CPUs (for example, CPs, FMs)