Inserter is working when he move items. If he put item into smart chest and next inserter will take it, it will cause a pulse signal. That pulse signal can be used to detect if inserter is working for example by reseting timer.
https://i.gyazo.com/1207616ac0817e0c8e38b3433afebbab.gif

One problem ...

Neotix wrote:You can detect that but it require a lot of effort, space and materials.

can you give me an example ?

DaveMcW wrote:You can't. Maybe in 0.13 next week.

Thank you..

I want to use circuit network. I have some ideas. But how can i detect a machine working or not. Pump and inserter is primary for now. Thank you..