In Robot , the units used are the KN and M
to get reactions :
MysumReactions = robapp.Project.Structure.Results.Nodes.Reactions.S
FXX = MysumReactions.FX / 1000.00;
why divide by 1000 to get the FXX in KN
In ROS API you can read:
"All functions of ROBOT Object Model use the standard SI unit, independently of the current settings in Robot options."
So, all forces you get from robot api are in N.