5:16 (16), 0-004-7516-1 (GB)
TAC AB, 1999-08-18
TAC Xenta 102 Handbook
Functional description
nciAppOptions
bit 7 = 1
Master
nvoHeatSlave
nciAppOptions
bit 7 = 0
nviBoxFlow
nviHeatSlave
Slave
nvoBoxFlow
Inputs
and
outputs
Wall
module
Outputs
Figure 5.6 Variable bindings between master/slave controllers.
5.3.8 Master/slave operation
The controller can control a number of slave units, which
makes it possible to control several TAC Xenta 102 controllers
within the same zone. When bit 7 in nciAppOptions is enabled
(=1) the controller works as a slave, otherwise as a master. The
slave and the master controller must be of the same type.
The value sent by means of the network variable nvoBoxFlow is
the current flow in the master VAV box. The value which is
sent via the variable nvoHeatSlave is the state for heating, the
percentage and state for a possible fan.
A TAC Xenta 102 working as a slave controller only controls the
heating, the air flow and the fan (if it is selected) according to the
values sent by its master controller on the network. It does not
consider other inputs.
The application mode, which can be read by means of the
variable nvoUnitStatus, is set to off mode for the slave.
The communicating network variables between the master
controller and all the slave controllers are bound according to
figure 5.6.
Index Variable name
Description
7
nvoBoxFlow
Box flow output
12
nvoHeatSlave
Heating control output for slave
22
nviBoxFlow
Box flow input
23
nviHeatSlave
Heating control input for slave
24
nciAppOptions
Application options
38
nciFlowOfstSlave
Flow offset for slave
