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The delay activity is used to only give delay after the previous activity is done while in the common properties Delay After, Delay Before is for that acivity to give before or after delay that activity is performed.
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Standard robots can be only deployed to a Standard machine while the floating robot can be deployed to both, Standard Machine or to a Machine Template.
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You can go through this thread Read same excel at the same time by multiple robots
Hope this helps you 
Cheers