Question about S7 Graph Instruction on 300 Series

Hello BrunnerC;

The S7-Graph manual explains it this way:

https://support.industry.siemens.com/cs/us/en/view/1137630

Hope this helps, 

Daniel Chartier 

Hello BrunnerC;

The term "disturbance" used in the English version of the manual for S7-graph relates to the German "Störung" used in ther German version of the manual:

Step_name.U: current or last activation time of the step without the time of a disturbance

Störung translates to "fault" or "error". This simply means that the Step_Name.U does not take into account any fault status when indicating the activation time of the step.

So mentally you could replace all occurences of "disturbance" by "fault" if this makes the issue clearer.

For example, this definition is analyzed in the manual (section 3,14), in nwhich they use "disturbance" and "error" interchangeably..

Acknowledge

If the "Acknowledge errors" option is clicked, you acknowledge a pending error message with the "Acknowledge" button. In this way, you can acknowledge a disturbance caused, for example, by the configured monitoring time in Step 2 being exceeded.

Note, however, that before you acknowledge the error you must make sure that the supervision or interlock conditions that led to the error are no longer satisfied. After an error has occurred, you can enable the next step in the sequencer by satisfying the step enable condition because the last step enable condition in the cycle in which you acknowledge has priority over the supervision. You must nevertheless acknowledge the error.

If the error was caused because the undisturbed activation time stepname.U has exceeded the configured monitoring time, you can move on the sequencer by clicking the "Acknowledge" button. This is possible because the Step name.U variable is set to "0" when you acknowledge.

hope this helps,

Daniel Chartier