Facility Explorer FX16 - Page 72

FX16 Master Controller Technical Bulletin
72
Although a fully loaded distributed application normally manages up to
300 physical data points, the performance of the whole application also
depends on a number of important factors:
• Local Link Extension Bus performance. See Local Link Extension
Bus Performances.
• network variables data flow rate and the number of variables in each
slave device in a Distributed Application
• FX16 Master Controller memory availability.
Note: The distributed application is stored in the FX16 controller
and the entire memory is dynamically managed; therefore, the larger
the distributed application, the smaller the memory left for the
display configuration and other services (such as Web and trends).
I/O expansion points from XTs modules on the FX16 Master Controller
do not count as shared network variables. You can only use the value of
an expansion point in a slave device by mapping it to a shared variable
in the FX16 Master Controller.
You can also connect XT modules to FX15 slave devices. The I/O
expansion points then count toward the total number of physical points
managed by the distributed application.
The best use of resources in the FX16 Master Controller is when you
distribute control processes to the slave controllers. Do not use the FX16
as a supervisory controller for points not involved in a control process.
I/O Expansion
The FX16 Master Controller has on-board inputs and outputs for
monitoring and control of local equipment. The Local Link Extension
Bus allows additional inputs and outputs to be connected to the FX16
Master Controller locally or remotely.
The FX16 Master Controller supports up to four XT extension modules
with a variety of combinations of analog and binary, input, and output
points. You can use data from these modules for display or as additional
inputs and outputs for control routines in the FX16 Master Controller (or
other connected controllers).
Extension Modules
An extension module comprises an XT91D00
processor/communications module and one or two XP expansion
modules. The expansion modules provide input/output capability for the
extension modules. The following are available for the XT91D00
extension module:
• XP91D02: six analog inputs and two analog outputs
• XP91D03: eight digital outputs (triac)