5.1.4 Real Time Clock Variable
The frequency converter has a built-in real-time clock. The
standard real-time clock has no battery backup function,
which will lead to a loss of time if the drive is un-powered.
Some BACnet Master's can be programmed to send out the
date and time as a Broadcast Telegram on a regular basis.
The BACnet Interface will update the real-time clock of the
drive if it receives the time synchronization telegram.
5.1 Feedback to Network
The BACnet option provides several output variables (nvo’s)
objects to the network, containing important -, motor- and
I/O feedback data. The BACnet option transmits bound
network variables only and sends feedback data when there
is a change in value.
Influence of the digital input terminals upon the Control
Mode,
to
The influence of the digital input terminals upon control of
the frequency converter can be programmed in
to
.
overrules the settings in
parameters 8-50 to
8-56
and Terminal 37, Safe Stop overrules any parameter.
Each of the digital input signals can be programmed to logic
AND, logic OR, or to have no relation to the corresponding
bit in the control word. In this way a specific control
command i.e. stop / coast, can be initiated by the fieldbus
only, fieldbus AND Digital Input, or Fieldbus OR Digital input
terminal.
In order to control the frequency converter via BACnet,
must be set to either Bus [1], or to Logic
AND [2] and
must be set to Digital and ctrl.
word [0] or Controlword only [2].
5.2 BIBBs
ReadProperty
Execute
WriteProperty
Execute
DeviceCommunicationControl
Execute
ReinitializeDevice
Execute
I-Am
Initiate
I-Have
Initiate
TimeSynchronization
Execute
Who-Has
Execute
Who-Is
Execute
BACnet Objects
VLT
®
HVAC Drive Native BACnet Operating Instructions
20
MG.14.C1.02 - VLT
®
is a registered Danfoss trademark
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