nqchanh

i've viewed S7-Graph user manual of Simantic, but i haven't understood about "interlock" and "supervision" ! what is the function of each of them ? hope for help ! ^~^

dchartier

Hello Parthasarathi;
And finally download the siemens tutorial for S7-Graph, it is module C1 of the S7-300 tutorials; it includes a sample program you can use to start your own application as well as the learning tools:

https://www.automation.siemens.com/mcms/sce/en/advanced_training/training_material/download_training_material/c_programming_languages/pages/default.aspx?HTTPS=REDIR

You will find data on interlocks and supervisions in the S7-Graph manual:

S7-GRAPH V5.3 for S7-300/400 Programming Sequential Control Systems

Interlock
An interlock is a programmed condition within a step. An interlock influences the execution of individual actions
Supervision
A supervision is a programmable condition within a step. A supervision influences the way in which control passes from one step to the next.

Both interlocks and supervisions are add-on controls for the sequence operation, and you do not require them when you develop your first programs. They can be added at any time afterwards, if you feel they are required.