Issue
Certain values in the Xenta 102-AX can be put into override mode through the Plug-In:
- Airflow
- Auxiliary Temperatures 1 and 2
- Universal Inputs 1, 2, 3, and 4
- CO2
- Space Temp
- Damper Position
- Universal Outputs 1, 2, and 3
If the plug-in is not available, they can be overridden through the SNVT input nviRequest (type SNVT_obj_request).
Product Line
EcoStruxure Building Operation, TAC Vista
Environment
Xenta 102-AX
Cause
The plug-in might not be available for a multitude of reasons. For example, if the Xenta 102-AX is being integrated into a third party LON system, or no LNS management tool is being used. The values below can be used to implement an override through the SNVTs.
Resolution
Signals required to perform external control of inputs and outputs on the Xenta 102-AX:
- Set the override behavior value signal to 1 (OV_SPECIFIED)
- Set the desired value in the override value signal
- Send a SNVT to the signal Node_Object.nviRequest. It is a structured SNVT input with the following members:
- OBJECT_ID - refer to the list below for the appropriate object ID for each override
- OBJECT_REQUEST - set to value to 6 (RQ_OVERRIDE) to initiate the override, set to value 0 (RQ_NORMAL) to release the override.
The tables below specify all necessary signals for each override. They are displayed in the following format:
| ID | Title |
| Overridden Value | |
| Desired Override Value | |
| Override Behavior |
| 1 | Airflow Reading (CFM, l/s) |
| Airflow_Sense.nvoAirFlow.PV | |
| Airflow_Sense.nvoAirFlow.SCPTovrValue.PV | |
| Airflow_Sense.SCPTovrBehave.PV |
| 2 | Universal Input 1 (%) |
| UnivIn1_Sense.nvoUnvInput1.PV | |
| UnivIn1_Sense.nvoUnvInput1.SCPTovrValue.PV | |
| UnivIn1_Sense.SCPTovrBehave.PV |
| 2 | Duct Inlet Temperature UI1 (°F, °C) |
| UnivIn1_Sense.nvoAuxTemp1.PV | |
| UnivIn1_Sense.UCPTovrValueTemp.PV | |
| UnivIn1_Sense.SCPTovrBehave.PV |
| 3 | Universal Input 2 (%) |
| UnivIn2_Sense.nvoUnvInput2.PV | |
| UnivIn2_Sense.nvoUnvInput2.SCPTovrValue.PV | |
| UnivIn2_Sense.SCPTovrBehave.PV |
| 4 | Universal Input 3 (%) |
| UnivIn3_Sense.nvoUnvInput3.PV | |
| UnivIn3_Sense.nvoUnvInput3.SCPTovrValue.PV | |
| UnivIn3_Sense.SCPTovrBehave.PV |
| 4 | CO2 Reading UI3 (ppm) |
| UnivIn3_Sense.nvoCO2sensor.PV | |
| UnivIn3_Sense.UCPTovrValueCO2.PV | |
| UnivIn3_Sense.SCPTovrBehave.PV |
| 4 | Outside Air Temperature UI3 (°F, °C) |
| UnivIn3_Sense.nvoAuxTemp2.PV | |
| UnivIn3_Sense.UCPTovrValueTemp.PV | |
| UnivIn3_Sense.SCPTovrBehave.PV |
| 5 | Universal Input 4 (%) |
| UnivIn4_Sense.nvoUnvInput4.PV | |
| UnivIn4_Sense.nvoUnvInput4.SCPTovrValue.PV | |
| UnivIn4_Sense.SCPTovrBehave.PV |
| 5 | Setpoint Offset UI4 (°F, °C) |
| UnivIn4_Sense.nvoSetPtOffset.PV | |
| UnivIn4_Sense.UCPTovrValueTemp.PV | |
| UnivIn4_Sense.SCPTovrBehave.PV |
| 6 | Space Temperature (°F, °C) |
| VAV_Controller.nvoSpaceTemp.PV | |
| VAV_Controller.nviSpaceTemp.SCPTovrValue.PV | |
| VAV_Controller.SCPTovrBehave.PV |
| 7 | Damper Actuator (%) |
| Damper_Actuator.nviRelStPt.PV | |
| Damper_Actuator.nvoActualValue.SCPTovrValue.PV | |
| Damper_Actuator.SCPTovrBehave.PV |
| 8 | Universal Output 1 (%) |
| UnivOut1_Object.nviUnvOutput1.PV | |
| UnivOut1_Object.nviUnvOutput1.SCPTovrValue.PV | |
| UnivOut1_Object.SCPTovrBehave.PV |
| 9 | Universal Output 2 (%) |
| UnivOut2_Object.nviUnvOutput2.PV | |
| UnivOut2_Object.nviUnvOutput2.SCPTovrValue.PV | |
| UnivOut2_Object.SCPTovrBehave.PV |
| 10 | Universal Output 3 (%) |
| UnivOut3_Object.nviUnvOutput3.PV | |
| UnivOut3_Object.nviUnvOutput3.SCPTovrValue.PV | |
| UnivOut3_Object.SCPTovrBehave.PV |
