Loop Object - Metasys - LIT-12011942 - "" - Software Application - Metasys Open Data Server - 10.1

Metasys Open Data Server Help
Product name
Metasys Open Data Server
Document type
User Guide
Document number
LIT-12011942
Version
10.1
Revision date
14/10/2019

Menu Selection: Insert > Object > Loop

The Loop object allows a third-party BACnet workstation to represent a control loop in a standard way. If you use the Site Management Portal as the primary mechanisms to view system information, you do not need to use the Loop object.

The Loop object represents the key information from a PID logic module. The object does not execute the PID algorithm but simply allows you to represent the key parameters of a PID logic module in a Focus tab view.

The Loop object uses the data provided by mapped field points to execute the BACnet intrinsic alarming algorithm. First, create a folder and map the field points representing the loop information. Then use the Insert Object wizard to add the Loop object to the same folder and configure references to the mapped points representing the loop information. The Loop object reads the information indicated by the references, and presents the values received in the Focus tab of the Loop object.

The behavior of the Loop object’s intrinsic alarming algorithm is as follows:

  • The loop object generates a TO OFFNORMAL event when the difference between the Setpoint Value and the Controlled Variable Value remain outside the band defined by the Error Limit and the Time Delay has been exceeded.

  • The loop object generates a TO NORMAL event when the difference between the Setpoint Value and the Controlled Variable Value is within the band defined by the Error Limit.

Note: You must configure references to the BACnet required properties to successfully create the Loop object. These references appear red in the wizard until configured. You may optionally configure references for the BACnet optional properties. If you do not define the optional references for some reason, the Loop object responds to a read for the corresponding value with an Unknown Property error. These BACnet required and optional properties are noted with footnotes in the attribute table. See Loop Attributes.