Carrier 30XW User Manual

Also see for 30XW: Installation, operation and maintenance instructions Operation instructions Installation, operation and maintenance instructions

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ECG–UG–14-002 REVISION DATE PAGE30XAXWBACnet Option Rev G March 2017 14 OF 56Back to Beginning of Chapter – Table of Contents4.3 Priority assignmentCommanding entities have their priority level assigned. The BACnet priority levelcorresponds to the CCN override level.If the Local Operating Type is set to Network, then it is possible to control the unit fromthe BACnet writing these objects: The highest priority value of the commandable object will be copied to the presentvalue of the object using the same name with the _rd suffix(e.g., GENUNIT_CTRL_PNT_wr highest priority value copied toGENUNIT_CTRL_PNT_rd present value).If the Local Operating Type is set to Local or Remote, then the Priority value won’t beapplied and the value determined by the controller will be applied: The present value of the object name with the _rd suffix will still reflect thecurrent software value (e.g., GENUNIT_CTRL_PNT_rd). The BACnet priority level corresponds to the CCN override level (1:1). If this BACnetpriority level is removed, the first non-NULL value in Priority_array property will beapplied to the corresponding CCN point (CCN "Auto" command will be applied first). * When the CCN override level is applied from the CCN, the CCN override level will bethe BACnet priority level. BACnet priority level 16 (the lowest) has no CCN equivalent and does not correspondto the CCN override. This priority level should not be used.*The Priority_Array consists of an array of commanded values in order of decreasing priority. The first valuein the array corresponds to priority 1 (highest prority), the second value corresponds to priority 2, etc. Thesixteenth value corresponds to priority 16 (lowest prority).4.4 Present Value property accessWriting AV and BV "Present Value" is authorized by the BACnet protocol for all objects.However, the Present value regarding the access object parameters (read-only orread/write) may or may not be authorised by the chiller application.If the "present value" property with an access parameter equal to RO is written, then thepresent value will be overwritten by the chiller application with the previous value.Objects with "present value" in read-only access are all objects used for chillerconfiguration and status.Objects with "present value" in read/write access are objects used for setpointconfiguration, i.e. objects with names with the SETPOINT_ prefix (e.g., SETPOINT_csp1)and Commandable objects with the _wr suffix (e.g., GENUNIT_CTRL_PNT_wr).4.5 Notification class objectThe notification class object can notify up to 5 BACnet devices. These devices are listedin the Recipient List property.IMPORTANTYou must enter the IP address of the device to notify (see also section 6).Device Name and instance are not yet supported.4.6 SavingsCOV increment property, Intrinsic Reporting properties, Priority values, Notification classand Trend log properties are saved in files and restored automatically on power-up.