Hello,
Device Tags work a bit differently in an Indicator Block. Currently, we do not support a live update of tag values within the Indicator Block, but can support static variables. If your limit0 value were a static value that did not change with the Input Control block, tags could be very useful. For example, if I set a Context Variable for my device tag that is always 28, I could use it within an Indicator Block, like so:
Since your limit0 value is dynamic and changes, I would recommend changing limit0 from a tag to an attribute, and following our walkthrough together from this post.
I was also wondering if you could provide some information on your end goal for this project so that I can recommend the most accommodating steps in the future! 
Hopefully this helps,
Julia