13 N30 Supervisory Controller User`s Manual: Working with Global
Contents
1. 4 Move the cursor to Slaves List i Press Enter The Global Data Sharing object Slaves List appears Figure 13 2 6 Press the F3 Add Item key to add a blank entry 7 Type in an object name and attribute name 8 Repeat Steps 6 and 7 for each new slave 9 Press the F4 Back key to return to the previous screen 10 Press the F3 Save key to save the changes 13 8 Working with Global Data Sharing Objects 11 12 13 Check the User Assistance area of the screen to verify if the save was successful or if there were errors If errors were detected correct them and resave the entries Once the save is successful continue with Step 12 Press any key to continue Press the F4 Cancel key to return to the container hierarchy Deleting Slaves from the Slaves List To delete slaves from the Slaves List 1 2 3 12 13 Browse to and highlight a Global Data Sharing object Press Enter to open the object Press the F3 Edit key The Global Data Sharing object attribute screen appears Figure 13 1 Move the cursor to Slaves List Press Enter The Global Data Sharing object Slaves List appears Figure 13 2 Highlight the slave to be deleted Press the F2 Delete Item key Repeat Steps 6 and 7 for each slave to be removed from the list Press the F4 Back key to return to the previous screen Press the F3 Save key to save the changes Check the User Assistance area of the screen to2. verify if the save was successful or if there were errors If errors were detected correct them and resave the entries Once the save is successful continue with Step 12 Press any key to continue Press the F4 Cancel key to return to the container hierarchy Commanding a Global Data Sharing Object To command a Global Data Sharing object 1 2 3 Browse to and highlight a Global Data Sharing object Press the F2 Command key The Command field appears Use the Spacebar and the Backspace key to cycle through the list until the desired command appears The Global Data Sharing object supports the command listed in Table 13 2 N30 Supervisory Controller User s Manual 13 9 Table 13 2 Supported Commands Command Description Enable Updates changes to the slaves list Disable Prevents distribution of Changes of Value 4 Press Enter Deleting a Global Data Sharing Object To delete a Global Data Sharing object 1 Browse to and highlight a Global Data Sharing object 2 Press Enter to open the object 3 Press the Delete key 4 Press the Tab key to confirm the deletion IRHNSON CONTRSLS Controls Group 507 E Michigan Street P O Box 423 www johnsoncontrols com Milwaukee WI 53201 Printed in U S A
3. Chapter 13 N30 Supervisory Controller User s Manual 13 1 Working with Global Data Sharing Objects Introduction The Global Data Sharing object permits the sharing of data from a single master input with up to 16 slave output references This chapter describes how to add a Global Data Sharing object edit a Global Data Sharing object add slaves to the Slaves List delete slaves from the Slaves List command a Global Data Sharing object delete a Global Data Sharing object May 1 2002 Johnson Controls Inc www johnsoncontrols com Code No LIT 6892130 Software Release 5 1 13 2 Working with Global Data Sharing Objects Key Concepts Global Data Sharing Object Attributes The Global Data Sharing feature distributes changes in value associated with a single master input to a range of between 1 and 16 targeted slave outputs For example Outdoor Air data can be distributed and shared between multiple Air Handling Unit AHU controllers The values of an object s attributes determine how the object operates The Global Data Sharing object attributes described below are listed in the order that they appear on the screen Entry requirements for these attributes are listed in Table 13 1 For additional information about the Global Data Sharing object and its attributes refer to the Object Dictionary Object Name Identifies the object on the user interface Description Provides optional information to further d
4. Check the User Assistance area of the screen to verify if the save was successful or if there were errors If errors were detected correct them and resave the entries Once the save is successful continue with Step 13 13 Press any key to continue 14 Press the F4 Cancel key to return to the container hierarchy N30 Supervisory Controller User s Manual 13 7 Editing a Global Data Sharing Object To edit a Global Data Sharing object Note To delete or add slaves refer to the appropriate sections of this chapter 1 Browse to and highlight a Global Data Sharing object 2 Press Enter to open the object Note Additional attributes appear Refer to the Object Dictionary for more information 3 Press the F3 Edit key The Global Data Sharing object attribute screen appears Figure 13 1 4 Edit the fields using Table 13 1 Press the F3 Save key 6 Check the User Assistance area of the screen to verify if the save was successful or if there were errors If errors were detected correct them and resave the entries Once the save is successful continue with Step 7 7 Press any key to continue 8 Press the F4 Cancel key to return to the container hierarchy Adding Slaves to the Slaves List To add slaves to the Slaves List 1 Browse to and highlight a Global Data Sharing object 2 Press Enter to open the object 3 Press the F3 Edit key The Global Data Sharing object attribute screen appears Figure 13 1
5. escribe the object Object Type Indicates the kind of object such as Schedule N2 Analog Input or Global Data In this case the object type is Global Data Object Category Determines the general classification of an object to help define user access capability and message routing Enabled Indicates if the object is active and executing an operational condition Master Identifies the attribute reference object and attribute name and its value state or status that is to be sent to the list of slaves Slaves List Identifies the names attribute references of from 1 to 16 Slaves that receive the value status or state of the Master N30 Supervisory Controller User s Manual 13 3 Refresh Timer Indicates the amount of time in minutes between updates to the Slaves from the Master Updates initiated by the refresh timer occur in addition to updates initiated by a Change of Value COV from the Master For example if the refresh timer attribute s value is 2 the Global Data Sharing object updates the Slaves with information from the Master every 2 minutes and with each COV Network Variable Sharing You can use the Global Data Sharing object to read a value from a BACnet device on the network and write a value to an N2 device Recall that the commanded refresh interval is based on the COV attribute of the source object The source object can have a very small COV value for example 0 0 for N2 commands however t
6. his forces all messages from the BACnet device to be written to the N2 devices N2 commands may overload the N30 and use an excessive amount of acquired memory If the excessive use of memory due to the overloading commands continues the N30 may reset There are two ways you can control this problem 1 Define a larger and more realistic COV value for the source object thus decreasing COV messages Using this method the message from the BACnet device is read by the Global Data Sharing object and written to the N2 devices The flow of information is BACnet device lt gt Global Data Sharing object gt N2 devices Or 2 If you cannot change the source object s COV value because it may affect the internal operation and application of the BACnet device you may need to create an intermediary Analog Value object in the N30 This allows the Analog Value object to update with the BACnet device s low COV value After creating the intermediary Analog Value object increase its COV value and define it as the source object for the Global Data Sharing object s N2 device destinations The amount of N2 commands being sent decreases due to the higher COV value and the decrease in the amount of changes Using this method the message from the BACnet device is read by the Global Data Sharing object sent to the Analog Value object sent to the Global Data Sharing object then sent to N2 devices The flow of information is BACnet de
7. s Blank Enter the exact object and attribute name Values containing the data to be distributed For example the name of the N2 Analog Input point object representing outdoor air temperature Slaves List Yes 0 items Enter the exact object name and attribute names of the object and attribute to receive the data For example the names of all Controller objects representing Air Handling Units in the site Present Value appears by default AHU1 Present Value Refresh Timer Yes 2 minutes 0 No timed refresh refresh occurs only upon COV IMPORTANT The system does not check to ensure that the master input and the slaves outputs are mapped to the same data type Each slave attempts to convert the value being received if necessary to the data type defined for itself 5 Move the cursor to Slaves List 6 Press Enter The Global Data Sharing object Slaves List appears Figure 13 2 13 6 Working with Global Data Sharing Objects LIZ ADMIN Thu 21 Feb 2002 10 06 CST Slaves List AHU1 Present Value Del Item 3 Add Item F4 Back Enter object and attribute name Figure 13 2 Global Data Sharing Object Slaves List 7 Type in an object name and attribute name Example AHUL Present Value 8 Press the F3 Add Item key and type in another slave 9 Repeat Steps 7 through 8 for all slaves being added to the list 10 Press the F4 Back key to return to the previous screen 11 Press the F3 Save key 12
8. vice lt gt Global Data Sharing object gt Analog Value object Global Data Sharing object gt N2 devices 13 4 Working with Global Data Sharing Objects Detailed Procedures Adding a Global Data Sharing Object To add a Global Data Sharing object 1 Browse to and highlight the Programming container 2 Press the F3 Add key The Add Object list appears 3 Highlight Global Data and press Enter The Global Data Sharing attribute screen appears Figure 13 1 Thu 21 Feb 2002 10 05 CST Object Name Description Object Type Global Data Object Category HVAC Enabled True Engineering Values Master AV1 Present Value Slaves List 6 Items Refresh Timer 2 minute F3 Save F4 Cancel Return Open Figure 13 1 Global Data Sharing Object Attribute Screen 4 Fill in the fields using Table 13 1 N30 Supervisory Controller User s Manual 13 5 Table 13 1 Attribute Entry Requirements Screen Area Attribute Required Default Options Range Object Object Name No Blank Maximum 32 characters Invalid characters If not completed the system assigns a name Description No Blank Maximum 40 characters Object Type Yes Global Data Default is preset and cannot be changed Object Yes HVAC Use the Spacebar and Backspace key to Category view and select options HVAC Fire Security Services Administrative Enabled Yes True Use the Spacebar and Backspace key to view and select options True False Engineering Master Ye
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13 N30 Supervisory Controller User`s Manual: Working with Global