Using DXRs and Central Functions for Central Operating Mode A6V12093876 2020-08-28 Smart Infrastructure Restricted
Restricted A6V12093876
Table of Contents Scope and Purpose ........................................................................................................... 4 DXR Templates and Central Functions ............................................................................... 4 Central Operating Mode .................................................................................................... 5 Overview 5 Central Functions .............................................................................................
Scope and Purpose This document provides an overview of the Central Operating Mode function and describes how to configure Central Functions and DXRs to coordinate properly. This central function can be very useful for projects that have schedules that include warm-up and/or cool-down. This document should give a brief overview of Central Operating Mode in order to determine if it would help for your specific project.
Central Operating Mode Overview The Central Operating Mode Determination passes central commands from PXC controller or Desigo CC Scheduler and distributes them to DXRs located in the building zones. The application receives operating mode commands (inputs) either • • • • 5 From Desigo CC via BACnet command (normally priority 8 or 13). It overwrites the other input sources. From a clock timer with switching output, switch or relay contact (Prio 16).
In general, Central Operating Mode applications are the bridge between a scheduler and the DXR located in rooms. The Central Operating Mode applications are used to send and receive data between the scheduler and the room DXR. For example, CenOssc11 in the above picture is an Application Function (AF) within CenOpMod11. The CenOssc1 determines what operating mode information is sent down (scheduler, BACnet command, etc.
Scenario Central functions & Group objects sent from Groups CenOpMod to Room Group objects sent from Room to Segment DelayTime (default) Single CF DXR with 1 Group CenOpMod(1) RM OPMODE (ROpMod) PLANT MODE (PltOpMod) 10 sec CenOpOssc11 COOLDWN (CoolDwnReq) WARMUP (WarmupReq) NEXT OP (NxOpMod) CenOpMod(1) Single CF DXR Grp1 CenOpOssc11 with 4 Groups COOLDWN (CoolDwnReq) WARMUP (WarmupReq) NEXT OP (NxOpMod) RM OPMODE (ROpMod) PLANT MODE (PltOpMod) 10 sec CenOpModDly1 COOLDWN (CoolDwnReq) WARMUP
Hierarchical Grouping All central AFs can be grouped hierarchically (except for Supply AFs where information is bundled). A "Hierarchical Grouping" function is a group master that distributes information to same-type subordinate AFs (group member). The central AFs contain all BACnet objects required to be used as master or member. Hierarchical grouping is used for different reasons: • Network exceeds a maximum recommended length.
Central Optimum Start/Stop Control (CenOssc11) IMPORTANT: The AF name deceiving as there is no logic/coordination inside this function. It is simply an interface used to distribute commands to the rooms. There is no “optimizing” involved. Optimization would take place higher up at the plant/scheduler. CenOssc11 distributes Warm-up, Cool-down, and Next Op Mode signals from either schedulers or superordinate (higher ranking) CenOpMod11 AFs to the rooms.
Point Database Description BACnet Name (Abbreviated) Type Operating mode switch OpModSwi BI Central operating mode command value Direction of Data Flow From To External contact (switch or clock) Commands CenOpModCmdV to Comfort @ Prio16: Auto mode 7, and sends the value to CenOssc11 CenOpModCmdv MPrcVal From Scheduler or DesigoCC manual operator commands Scheduler commands @ Prio15: Auto mode 6. Desigo CC commands @ 8:Man. operating mode 2 or 13:Man mode 3.
Central Operating Mode Extended Function (CenOpModExtd11) This AF is used ONLY for presence mode and operating strategy. CenOpModExd11 permits detailed central operation of presence mode for HVAC, lighting and shading as well as operating strategy for lighting and shading. The AF distributes these commands either to subordinate AFs or directly to the connected rooms. Note, CenOpModExtd11 is used only with outside logic or scheduling.
Central Room Operation Distribution (CenROpDstr01) IMPORTANT! DO NOT use this function CenROpDstr01 Central Operating Mode Delay (CenOpModDly11…13) This application function is used to program a delay in the signals sent by the Central Operating Mode functions. All elements of the Central Operating Mode group (i.e. the outputs of CenOpMod11 and the included AFs) are distributed to the rooms after a configured delay.
Central Functions Central Functions Basics The Central Function Application or Coordinator is implemented through the use of a DXR2E/M.18 controller. Central Functions coordinate the actions of the room controller to the primary plant. A DXR running the Central Function Application facilitates group data exchange between room applications or DXRs and the primary plant controller or Field Panel.
Bundling Central Functions can also be bundled together to collect and distribute Group Member data to / from multiple Central Function DXRs. All central functions have “bundled” variants that are used as subordinate central functions to one master. If one central function may not be enough to control all of the data from the room DXRs, a higherlevel Central Function DXR can be used to communicate between the lower level central functions to the AHU/primary plant.
Adding a Central Function 1. Choose the Building component. 2. Choose the Building Structure task. 3. Choose the Add application template button from the Add Device dropdown. 4. 5. 6. 7. 8. Choose the Types in Library tab. Choose the CentFnct11_A type. Select the AS Type required. Choose the Add template to project button. Use the default name, version, and description and click OK. 9. Click the Template Properties button.
10.Click the Unlock button. 11. Enter an Application Number. 12. Click OK.
Configure Central Function for Central Common Functions 1. 2. 3. 4. 5. 6. Choose the Central Common Function. Choose the following: Central operatinig mode Click the drop down and change None to Active. Choose the following: Optimum start stop control Click the drop down and change the setting from None to Active. Choose the following: Operating mode switch-on delay 1 (if needed, select addional Operating mode swith-on delay(s) for additional groups.) 7.
9. Change Infrastructure Priority Objects IMPORTANT: When configuring a Central Function app type for the first time, the Infrastructure Objects must be changed. If they are kept as defaults, they can cause alarms to come in at a Life Safety priority, regardless of whether they are high priority. They should be as shown here: 10. Click OK. 11. Close the application. 12. Add the Central Function Automation Station to the Building Hierarchy.
Configuring Group Members and Masters Group master/member communication is how all central functions read and write to other applications. The high-level central function controls a single Group Master object. This Master object is then what writes to the Group Member objects in the lower level application functions.
6. Expand the Central function. Modify the Group Number to 1. (It may already be set to 1) 7. With the Group Master selected, the VAV Automation Stations should be displayed in the Group Members tab. All Automation Stations used in the Duct Pressure Reset calculations must have an Assigned selection in this tab. All Central Functions can be grouped hierarchically, which is used for separating Group Member and Master functions.
8. Use Assign Selected or Remove Selected buttons may be used to assign or remove the VAV Automation Stations from the group. Once the Terminal application is connected as shown, the data from the VAV box should be collected and read by the Central Function. This will allow the Central Function DXR to communicate with the AHU and perform Duct Pressure Reset correctly.
Issued by Siemens Industry, Inc. Smart Infrastructure 1000 Deerfield Pkwy Buffalo Grove IL 60089 +1 847-215-1000 A6V12093876 (BA) © Siemens Industry, Inc., 2020 Technical specifications and availability subject to change without notice.
