Manual has this to say:
Quote:
ROBOTS must use at least one (1) diagnostic ROBOT Signal Light (RSL) (P/N: 855PB-B12ME522).
Any RSL must be:
mounted on the ROBOT such that it is easily visible while standing three (3) ft in front of the ROBOT,
connected to the “RSL” supply terminals on a Digital Sidecar that is connected to an NI 9403 module in Slot 2 of the cRIO, and
wired for solid light operation, by placing a jumper between the “La” and “Lb” terminals on the light per Figure 4-13.
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So, in a practical sense, it mostly needs to be visible for field personnel in case your robot is having a connection/code/power issue, or similar.
Also, you can have more than one.
Ninja'd