Slot The slot number is the physical location of the I/O module. This may be a combination of the rack number and the slot number when using expansion racks. Word and Bit The word and bit are used to identify the actual terminal connection in a particular I/O mod- ule.

The fastest slot dragsters are said to have terminal speeds around 135-140mph, the highest claim I've seen is 158 mph but more details of the exact speed and how it was measured would be needed to give a precise record.