That relay is used to switch on the spindle of the cnc.Is this an MB2 system?
If so, it just looks as though this is a typical connection for the outputs, and appears this is just an example of a typical output usage and thus if not switching an inductive load with the relay, the R/C snubber is not really required.
Also in the case of the MB2, I believe they are opto coupler outputs and in some cases may not require a relay, i.e. DIR input to a VFD etc.
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