44 LonTalk Communication Interface • ACC-SVN100A-EN
Network Variable and Configuration Property Definitions
nvoStartsRunTmX
Starts and run time—compressor X,* UNVT_starts_runtime
nvoStartsRunTmA
nvoStartsRunTmB
nvoStartsRunTmC
nvoStartsRunTmD
nvoStartsRunTmE
nvoStartsRunTmF
This network variable provides the number of starts and the amount of running time over
the life of compressor X (*where X is A, B, C, D, E, or F, depending on the network
variable.) There are separate network variables for each compressor.
nvoStatus
Status request output, SNVT_obj_status
This network variable indicates the status of the objects in the node. Sent in response to
nviRequest or poll or heartbeat. Polling does not update nvoStatus. For example, polling
will not change the alarm bit. Only nviRequest and heartbeat update nvoStatus.
Structure definition
Field in structure Description
SNVT_count_f Starts—compressor X
SNVT_time_f Run time—compressor X
Structure definition (6 bytes)
Item Type Report mask Byte # Bit # Definition
object id unsigned 16-bit 0, 1 0 = node object
1 = chiller object
2 to 65535 = invalid
invalid_id
a
bit 0 2 7 1 = requested ID is not implemented
in this node
invalid_request
b
bit 0 2 6 1 = request for unimplemented
function
in_alarm
c
bit 1 4 6 1 = object is in alarm (only shutdown
alarms, not warnings)
report_mask
d
bit 1 4 4 1 = status is an event mask (set for
RQ_REPORT_MASK)
a
invalid_id: A status of invalid_id is reported whenever a nviRequest is received for an object id that is not implemented in the node.
b
invalid_request: A status of invalid_request is reported whenever a nviRequest is received for an unimplemented function.
c
in_alarm: A value of TRUE is reported if the controller has a diagnostic condition.
d
report_mask: Report_mask status is used to document the status bits that are supported by the object. The obj_request code
RQ_REPORT_MASK causes the object to respond with a mask of supported status bits by way of nvoStatus. A ONE in the mask means
that the object may set the corresponding bit in the object status when the condition defined for that bit occurs. A ZERO means that the
bit will never be set by the object. When reporting status in response to a RQ_REPORT_MASK, the report_mask bit must be set to dis-
tinguish this from other forms of status.
Note: Any bits within SNVT_obj_status that are defined by the LonMark profile but are not listed above, are not used by the UC800 controller
and have no affect on its operation.
