IRC5 contactors K1 & K2

in RobotStudio
I am a newbie studying ABB robots. I know K42 and K43 are motor on contactors. What are K1 & K2? I am quoting the following directly from a ABB manual. "The motor contactors K1K42and K2K43 in the controllerdrive module can operate with external equipment if external relays are used." Thank you.
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