Robots occasionally break and need to be serviced. Adds maintenance and attrition to bot use.
Small changes concerning balance, gameplay, or graphics.
Related to roboports and logistic robots.
https://mods.factorio.com/mod/IngosAdvancedStart
The construction bots added by this mod appear to not have a "broken" bot equivalent, so your control code can't find it when it should. Poking around a little, it seems it should be made, it just isn't.