EATON
VFX Product Family Installation and Operation Manual E-ELCL-II003-E1 November 2014
15
VFX Product Family
11.7
Remanent Variables
These are variables that can retain their value
throughout the usual program run period. They
are declared as 'Retain Variables', or even more
stringent, as 'Persistent Variables'. For each case,
a separate memory area is used.
The declaration determines the degree of
"resistance" for a remanent variable in the case
of resets, downloads or a reboot of the PLC.
In applications, the combination of both remanent
flags will be required.
The following table indicates how variables behave:
VAR PERSISTENT /
After Online
VAR
VAR RETAIN PERSISTENT /
command
VAR
RETAIN
VAR PERSISTENT RETAIN
Power cycle
-
x
x
Reset warm
-
x
x
<application>
Reset cold
-
-
x
<application>
Reset origin
-
-
-
<application>
Download
-
-
x
<application>
11.8
File System Operation
In addition to providing storage for the operating
system, the flash file system also provides storage
for additional information (e.g. configuration, license
files for libraries, calibration, hardware or software
details, options, etc.).
Pro-FX Control has a graphical interface for
transferring files between the PC and the display.
Programmable access to the file system is managed
through libraries such as the SysFile library (e.g.
SysFileOpen, SysFileRead, SysFileWrite functions).
The maximum directory and file name size is
16 characters.
12.0
INSTALLING THE DISPLAY
12.1
Product Dimensions
Ideally the display should be mounted on a vertical
flat surface with connector facing down. Use four
standard threaded fasteners (6-32) to secure the
display to the surface.
VFX40m Dimensional data
