How to change the Control Scheme Schedule on a PlantEquipmentOperationScheme ?

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Using Openstudio (2.1.0) how can I change 'Always On Discrete' to a schedule of my choice?

I am confused because calling model.getPlantEquipmentOperationSchemes() returns a list of OS:PlantEquipmentOperation:CoolingLoad objects.

$model.getPlantEquipmentOperationSchemes()
 [OS:PlantEquipmentOperation:CoolingLoad,
  {0f6d331e-560f-4bf3-b6b1-876bd6eae5d4}, !- Handle
  North Building Cooling Tower Staging,   !- Name
  0,                                      !- Load Range Lower Limit 1 {W}
  934,                                    !- Load Range Upper Limit 1 {W}
  {0e4d7a85-4f39-4ceb-9e39-e03915c08726}, !- Range Equipment List Name 1
  934,                                    !- Load Range Lower Limit 2 {W}
  1401,                                   !- Load Range Upper Limit 2 {W}
  {307111b7-eddd-4d1f-87df-9a6865a3457a}, !- Range Equipment List Name 2
  1401,                                   !- Load Range Lower Limit 3 {W}
  4762,                                   !- Load Range Upper Limit 3 {W}
  {6b0a97b3-6a33-4685-976e-60e4cb773ebb}, !- Range Equipment List Name 3
  4762,                                   !- Load Range Lower Limit 4 {W}
  1000000000,                             !- Load Range Upper Limit 4 {W}
  {ca22b596-b1e2-4f60-b5b8-8b527101b7a0}; !- Range Equipment List Name 4 ]

I am expecting that call to return the object like this from the idf

   PlantEquipmentOperationSchemes,
          North Chilled Water Loop Operation Schemes, !- Name
          PlantEquipmentOperation:CoolingLoad,    !- Control Scheme Object Type 1
          Plant Equipment Operation Cooling Load 7, !- Control Scheme Name 1
          Always On Discrete;                     !- Control Scheme Schedule Name 1

I'm trying to set the Control Scheme Schedule to control the operation of the chillers and pumps on the chilled water loop.