Originally Posted by
dezsoe
There's no problem with the AXBB-E: it needs 5V for the logic side and 24V on the controlled side. The 24V can be 5V to 24V, depending on your needs.
Reading the PDF you linked, it turns out that the MKS needs no power supply: it uses only the 5V from the USB. It generates the controlled side power with a DC-DC converter.
To replace the MKS the AXBB-E seems to be the best choice, but you need the 5V supply and another for a higher voltage. The photos are so low resolution that I can hardly see anything on them. Can you take some useable photos? And also, open the lid on the VFD to see those cables too. Are the limit sensors simple micro switches?
(I can't see if the red cable is connected to the 5V output, where the 4th axis' cable goes, etc.)