User Guide

Chapter 2 - BACnet Field Panel Web Server System Administration
Performance and Limitations
18
Siemens Industry, Inc.
BACnet Field Panel Web Server User Guide
125-3584
2017-07-31
Performance and Limitations
● An interface is available via the Human-Machine Interface (HMI) to save files to
and restore files from the RAM drive, USB media, or the Field Panel’s Internal
Flash Drive (IFD). For more information, see the
APOGEE BACnet ALN Field
Panel User's Manual
(125-3020).
● Graphics files can be published from the Siemens FINlite Graphics Tool to the field
panel’s RAM (Drive A) or USB (Drive B). For graphics to be preserved across a
coldstart, files must be saved on the IFD or stored on a USB drive. Any graphics
files stored only on the panel’s RAM drive will not be preserved across a coldstart.
Files can be saved to the IFD using the Graphics Backup feature in the HMI.
● When files are added to or deleted from the panel’s IFD, the panel’s performance is
impacted. All other field panel processes are interrupted, and the panel may
temporarily drop off of the network and not provide COV updates.
● There are 8 MB of RAM available on the RAM (Drive A), but it is recommended
that 4 MB of RAM is kept available for field panel operations. Individual graphic
sizes typically range from 300 KB to 500 KB, depending on background resolution.
● Cache refresh time is affected by the number of objects and FLN devices on the
panel. Panels with multiple FLN applications or multiple FLN types could
experience longer refresh times.
● USB devices must be formatted as FAT. Due to USB memory device
manufacturer, size, and contents, the time to detect the device will vary from
several seconds to one or more minutes. Cruzer, SanDisk, and Kingston brand
devices were used during development and testing.
The following devices are supported by the installed device drivers.
Brand
Description
ADISK
USB 1.1 32 MB flash disk
Aigo
USB 1.1 64 MB flash disk
Crucial
1 GB flash disk
Edge DiskGO™
1 GB USB Flash Drive Enhanced for ReadyBoost™
2 GB USB Flash Drive Enhanced for ReadyBoost™
FPT-D
US5B2H01 18-in-1 USB card reader/writer
HP
1 GB flash disk
IBM
Portable Diskette Drive (floppy drive)
Imation
1 GB Swivel USB Flash Drive
2 GB Swivel USB Flash Drive
Integral
USB 2.0 2 GB flash disk
1 GB USB Memory Stick
Kingston
DataTraveler 1 GB flash disk
DataTraveler 100 2 GB flash disk
DataTraveler 16 GB flash disk
LACIE
USB 2.0 40 GB mobile hard drive