Useful information to include:

• Minecraft version : 1.12.2
• CC: Tweaked version : cc-tweaked-1.80pr1.11

If you power a block with an redstone torch or an redstone repeater, the rs.getInput function will return false.
Image of the setup
https://www.directupload.net/file/d/5292/q6rxeox9_png.htm