Object/Attribute Involvement - Metasys - LIT-12011942 - Software Application - Metasys Open Data Server - 10.1

Metasys Open Data Server Help
Product
Building Automation Systems > Databases and Data Servers > Metasys Open Data Server
Document type
User Guide
Document number
LIT-12011942
Version
10.1
Revision date
2019-10-14

Building an Optimal Start application means that the OST object and its associated Schedule object must have their attributes configured to reference the appropriate objects in order to achieve the desired operation. The following table lists the objects and attributes involved and guidelines for data entry.

Table 1. Optimal Start Object/Attribute Involvement

Object Type/ Function

Attributes Involved

Data Entry Guidelines

Optimal Start Object

Zone Schedule Object

Enter the Object Name of the Schedule object that schedules occupied and unoccupied times for the binary object controlling the zone occupancy mode of the heating and cooling equipment for the zone.

This object must be defined in the schedule and have valid start and stop times for the current day for the Optimal Start object to run. Only one start time and stop time can be defined per day, and the start time must precede the stop time.

Zone Occ Mode Obj

Enter the Object Name of the binary object controlling the occupancy mode of the heating and cooling equipment for the zone.

Zone WC Mode Obj

Enter the Object Name of the binary object (BO, BV, MO, or MV object) controlling the warmup and cooldown mode of the heating and cooling equipment for the zone. This may be the same object as the Zone Occ Mode Object.

Note: If the Zone Occ Mode Obj and the Warmup/Cooldown Mode Obj are the same point, then the point is commanded by the Scheduling at the scheduled time.

Cooling Setpoint

Enter the Object/Attribute Name of the analog value that represents the cooling setpoint.

Heating Setpoint

Enter the Object/Attribute Name of the analog value that represents the heating setpoint.

Zone Temperature

Enter the Object/Attribute Name of the analog value that represents the temperature in the zone being controlled.

Outdoor Air Temp

Enter the Object/Attribute Name of the analog value that represents the outdoor air temperature.

If this attribute is not defined, or the referenced analog attribute is offline, the outdoor air temperature is assumed to be within the design temperatures limits for the OST calculations.

If an analog attribute reference is defined for the outdoor air temperature, its value determines if the Optimal Start object should adapt heating and cooling constants and deadtimes.

If its value is outside the design temperature limits, deadtime and constant calculations are skipped.

If its value is outside the design temperatures before the warmup or cooldown period, the optimal start time is set to the maximum prestart time.

If its value is outside the design temperatures before the unoccupied period, Prestop does not occur.

Schedule Object

List of Object Property References

Enter the Object Name of the binary object controlling the occupancy mode of the heating and cooling equipment for the zone as one of the Property References.