Viconics VT7200 (Echelon) Integration Manual - Manual (Page 12)

12
Output Network Variables (nvo’s) Description
All output network variables will be updated no faster than the Minimum Send Time (nciMinOutTm) configuration
value.
An output network variable will be transmitted immediately when its value has changed significantly
(manufacturer’s defined). Additionally, this variable will also be transmitted as a heartbeat output on a regular
basis as dictated by the Maximum Send Time (nciSndHrtBt) configuration value.
Parameter Variable
Name Function
Room
Temperature network output
SNVT_temp_p
nvoSpaceTemp This output network variable is used to monitor the effective space
temperature sensor that the Space Comfort Controller is using for
control. This output echoes the value of the input.
Valid Range: 14 to 122°F (-10 to 50°C)
The value 621.07°F (327.67°C or 0x7FFF) will be sent as an
invalid value in case of a sensor failure.
Supply
Temperature network output
SNVT_temp_p
nvoDischAirTemp This output network variable is used to monitor the temperature of
the air that leaves the Space Comfort Controller
NOTE: UI3 needs to be configured to (SS) Supply air sensor
monitoring
Valid Range: -40 to 122°F (-40 to 50°C)
The value 621.81°F (327.67°C or 0x7FFF)will be sent as an invalid
value in case of a sensor failure.
Room
Humidity network output
SNVT_lev_percent
nvoSpaceRH This output network variable indicates the space humidity in
percent.
Valid Range: 0 to 100%.
The value 0x7FFF = +163.835% will be set as an invalid value to
indicate a humidity sensor failure.
This output network variable is used to indicate the actual
occupancy mode of the unit. This information is typically reported
to a supervisory controller or provided to another Space Comfort
Controller to coordinate the operation of multiple units
Valid Range:
0 = OC_OCCUPIED
1 = OC_UNOCCUPIED
2 = OC_BYPASS
1
Effective
Occupancy network output
SNVT_occupancy
nvoEffectOccup
3 = OC_STANDBY
Note 1: OC_BYPASS can be initiated by either nviOccManCmd or a
local input. NvoEffectOccup will only be in OC_BYPASS for the
duration of the ToccTime (nciGenOpts), until reinitiated by either a
transition of the local input or an update to nviOccManCmd.
This output network variable is available to report the Space
Comfort Controller status. It combines the operating mode, the
capacity of heating and cooling used and an indication if any
alarms are present in the object.
Sub Name Valid Value
01 mode HVAC_AUTO
HVAC_HEAT
HVAC_MRNG_WRMUP – Not Used
HVAC_COOL
HVAC_NIGHT_PURGE – Not Used
HVAC_PRE_COOL – Not Used
HVAC_HVAC_OFF
HVAC_HVAC_TEST – Not Used
Unit Status
network
output SNVT_hvac_status
nvoUnitStatus
HVAC_HVAC_EMERG_HEAT – Not Used