Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 19449435, Entry date: 09/07/2004

Error message ID 16#59A1 in the diagnostics buffer of Technology CPUs

  • Entry
  • Associated product(s)

Why does the Technology CPU go into STOP with a message in the diagnostics buffer to the effect that there is a configuration error (error no.: 16#59A1) in the integrated S7 technology?

One possible cause of this behavior is that the technology system data has not been generated in the Hardware Configuration. Open the Hardware Configuration of your STEP 7 project and double-click on the S7 Technology (slot 3) of the Technology CPU. In the Technology system data tab you enable the Generate technology system data option and save the setting withOK.

Fig. 1: Enabling the "Generate technology system data" function in the S7 Technology configuration tool

Save and compile the Hardware Configuration and then you have to reload the system data blocks or the Hardware Configuration into the CPU.

More information is available in the manual "S7 Technology" in Entry ID: 30119663 .

SIMATIC Technology CPU

Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit