Balluff Network Interface ProfiNet™ 
www.balluff.com         
The first part of the diagnosis is the so-called Block Header, which is 24 bytes long.  
The first 2 bytes of the Block Header are described by the Block Type to define the data 
type. 
 
2 bytes of data that define the length of the following diagnostics message. 
(For the complete diagnostics message, the 2 bytes from the Block Type and the 2 bytes 
from the Block Length must be added.) 
2 bytes; the information on the type of alarm is provided here 
 
2 bytes of data that describe which slot of the module reports an error 
 
2 bytes of data that describe which subslot of the slot reports an error 
 
4 bytes of data that describe which module is inserted in the respective slot. 
(The module ID is saved in the GSDML) 
 
BNI PNT-502-102-Z015 (header module) 
4 bytes of data that describe which submodule is used with the respective module. 
(The submodule ID is saved in the GSDML.) 
 
BNI PNT-502-102-Z015 (header module)