FX16 Master Controller Technical Bulletin
74
Distributed Application
A distributed application is a control strategy managed by the FX16
Master Controller; however, a distributed application executes
concurrently in the FX16 Master Controller and in up to 16 Facility
Explorer controllers connected to the Local Link Bus. The network
variables in the distributes application define the communication
between the controllers. FX16 Master Controller also executes the
communication in the most effective way to maintain the performance
of the entire control system.
Distributed applications are used for the coordinated control of a central
plant and the remote equipment that the central plant serves. For
example, you can apply a distributed application to an FX15 controlling
an air handling unit and a number of FX07 controllers controlling zone
temperature controllers. With the distributed application, you can also
select Facility Explorer controllers to provide the required inputs and
outputs for the individual pieces of physical equipment. Then you can
develop an application that is automatically distributed and executed in
the individual controllers as a single combined control system.
Each slave device works independently and provides its own
information to the network through the application profile. The FX16
controller polls, refreshes, or commands the network variables within
the controllers to synchronize the entire distributed application and to
get it to work as a single application.
The distributed application directly downloads into the FX16 controller
and the relevant parts are subsequently downloaded by the FX16 to the
connected slaves.
Slave Controllers in a Distributed Application Polling
Mechanism
The FX16 Master Controller continuously polls the connected devices
as defined in the control application. As soon as the devices respond,
the FX16 starts to download the relevant part of the distributed
application.
The Facility Explorer controllers used as slave devices must have the
N2 Open communication card properly installed.
The connectable slave controllers appear in Table 22.
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