Standard blocks for the application

The standard blocks are standard →functions and standard →function blocks provided by Neuron Power Engineer and as described in the →IEC-standard or realized as enhancement to this standard.

The project within the project explorer contains the following system libraries providing the standard blocks:

Name of system library Purpose
Standard (non-safe) system blocks not supported for creating a safety-relevant application.
Standard (safe) system blocks supported for creating a safety-relevant application.

Each system library corresponds to a project subfolder that has the same name as the library. Do not manipulate the folders and its contents! If you do nevertheless, Neuron Power Engineer does not find the library or the blocks any longer. 

No check of invalid connections

For some blocks, invalid connections are not checked by Neuron Power Engineer. Therefore, enter code in your application to detect invalid connections (e.g. IF-statements in the ST-code). Example: An invalid connection occurs during a calculation using a standard block. Giving you a specific example: Calculating -250.5 by means of the EXPT-block is an invalid connection.
Invalid connections of blocks that are checked by Neuron Power Engineer are listed in the description of the corresponding block.

If invalid connections are occurring while your application is executed, it is possible that:

  • Wrong results are calculated.
    Subsequently, these wrong values are displayed in the Values of Variables view. Remove the error in the ST-code so that there is no invalid connection anymore, then load the application anew onto the PLC.

  • The execution of the application terminates unexpectedly.
    Subsequently, no values for the application are displayed in the Values of Variables view. Remove the error in the ST-code so that there is no invalid connection anymore, then load the application anew onto the PLC. 

  • The PLC terminates unexpectedly.
    Subsequently, no values for the application are displayed in the Values of Variables view and the Instances view displays state Offline. Restart the PLC, remove the error in the ST-code so that there is no invalid connection anymore, then load the application anew onto the PLC.
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