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PlantLoop is the one that has the Load Distribution Scheme (see E+ I/O Reference Guide here)

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By default OpenStudio will create PlantEquipmentOperation:Cooling load object with only range (from 0 to infinite Load) with all equipments that can provide cooling in the range. If you want to customize further (that is, for eg, say that from 0 to 10e4 Joules, you only want chiller 1 and 2, and from 10e4 to infinite you allow chillers 1 2 and 3), you'll need to use the ruby bindings (or create an OpenStudio Measures) to create and assign the PlantEquipmentOperationCoolingLoad that you need.

It's also possible to implement your own sequencing using EnergyManagementSystem but that's going to be more complicated.