Honeywell Centraline FALCON User Manual page 119

USER GUIDE
Trending Trending can be performed via the Excel Web HTML Interface residing on any PC
platform and via BACnet clients. Trend data is stored on an 2 MB integrated Flash
memory which can hold a maximum of 64,000 trend records distributed among 125
trend log objects. In addition, three trend log objects are used for LON statistic
trending. A single trend log object can include max. 2.880 trend records (max. trend
buffer size). One trend record equals 30 bytes. Extended trend memory is possible
by using a 3
can be in ´Ringbuffer` mode or in ´Stop When Full` mode. Trend data are
dynamically created in the controller and can be saved in a .CSV file.
Trend data have unlimited lifetime and survive a firmware download under the
following preconditions:
• The Cleanup XL Web option in the Transfer: User Upgrade dialog box must be
unchecked (for details on general procedure, see "Download Excel Web
Controller Firmware (Upgrade)" section in CARE User Guide EN2B-0182GE51)
• The trend object(s) must have been active at least 80 seconds before a firmware
download is executed, because only every 80 seconds online changes like trends
are saved into the Flash memory
Trend objects must be explicitly deleted via Excel Web HTML Interface or BACnet.
This deletes also the corresponding trend records. The trended object may be a
local or a reference point in the same controller and the trended property may be
integer or floating point, e.g. point value, point state, alarm limit, time stamp.
If trending on the CF card is enabled and the CF card is either pulled or become
damaged, the controller will automatically continue the trending using the internal
Flash memory.
The Excel Web application can comprise several plants. This is defined in the CARE
programming tool.
Plants are typically defined to match the controlled application, e.g. Air Conditioning
Plant, Boiler Room, Chillers, etc.
On plant level you can shutdown and restart the application which is running in the
corresponding controller. This is possible via the Excel Web HTML Interface and via
BACnet. In the Excel Web HTML Interface also the latest start and stop date is
displayed.
The data processing of the controller is programmed in control loops. Authorized
users, using the CARE software, define them. A control loop receives the input
values from sensors and other hardware or software components. The controller
calculates with these values and determines if a regulation is necessary. In such a
case, the controller initiates the predefined reaction by switching the connected
hardware or software.
There are three types of control loop functions:
• Functions
Functions are basic logic elements with which you can build macros. They cannot
be created, edited or removed.
• Macros in a plant
rd
-party standard Compact Flash card or micro drive. Trend data storage
115
FALCON
TRENDING
PLANTS
CONTROL LOOPS
EN2Z-0962GE51 R0715