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I have 3 chillers in my system. I use this EMS to control the chiller's On/Off status. In PlantLoop configuration, I setup Load Distribution Scheme to UniformPLR.

EnergyManagementSystem:Sensor,
    Chiller_1_status_Sensor,      !- Name
    On during OPH,                !- Output:Variable or Output:Meter Index Key Name
    Schedule Value;               !- Output:Variable or Output:Meter Name

EnergyManagementSystem:Actuator,
    Chiller_1_status_Actuator,    !- Name
    Chiller 1,                    !- Actuated Component Unique Name
    Plant Component Chiller:Electric:EIR,  !- Actuated Component Type
    On/Off Supervisory;           !- Actuated Component Control Type

EnergyManagementSystem:Program,
    ControlChiller_1_OnOff,       !- Name
    SET Chiller_1_status_Actuator = Chiller_1_status_Sensor;  !- Program Line

EnergyManagementSystem:ProgramCallingManager,
    Chiller_1_OnOffManager,       !- Name
    AfterPredictorAfterHVACManagers,  !- EnergyPlus Model Calling Point
    ControlChiller_1_OnOff;       !- Program Name 1

I test chiller 1 and 3 operations (turn off chiller 2). The flow rate through chillers works properly both refer to the On/On schedule, but the chiller 1's cooling energy is 0. I expected half of the total coil cooling load of each chiller.

I have 3 chillers in my system. I use this EMS to control the chiller's On/Off status. In PlantLoop configuration, I setup Load Distribution Scheme to UniformPLR.

EnergyManagementSystem:Sensor,
    Chiller_1_status_Sensor,      !- Name
    On during OPH,                !- Output:Variable or Output:Meter Index Key Name
    Schedule Value;               !- Output:Variable or Output:Meter Name

EnergyManagementSystem:Actuator,
    Chiller_1_status_Actuator,    !- Name
    Chiller 1,                    !- Actuated Component Unique Name
    Plant Component Chiller:Electric:EIR,  !- Actuated Component Type
    On/Off Supervisory;           !- Actuated Component Control Type

EnergyManagementSystem:Program,
    ControlChiller_1_OnOff,       !- Name
    SET Chiller_1_status_Actuator = Chiller_1_status_Sensor;  !- Program Line

EnergyManagementSystem:ProgramCallingManager,
    Chiller_1_OnOffManager,       !- Name
    AfterPredictorAfterHVACManagers,  !- EnergyPlus Model Calling Point
    ControlChiller_1_OnOff;       !- Program Name 1

I test chiller 1 and 3 operations (turn off chiller 2). The flow rate through chillers works properly both refer to the On/On schedule, but the chiller 1's cooling energy is 0. I expected half of the total coil cooling load of each chiller.