Rockwell Automation 1766-L32AWA, User Manual

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82 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Chapter 5 LCD and Keypad
3. If you have finished viewing I/O status, press ESC to return to the Main
Menu screen, as shown in step 1 .
Monitor User Defined Target
Files
The LCD allows you to view and change the data values of 256 bits, words or
double integers in a user defined file. You can access to this functionality via
the Monitoring screen of the LCD screen.
To monitor the bit file on the LCD screen, you have to specify its file number in
the Target User Defined File Number (TUF) element of the LCD Function File
and download your application program to the controller. The TUF element
can only be changed by a program download.
Target User Defined File Number (TUF)
The value stored in the TUF element identifies the bit file with which the LCD
will interface. Valid bit files are B3, and B10 through B255. When the LCD reads
a valid bit file number, it can access up to 256 bits (0...255) on the LCD screen.
The protection bit (LCD edit disable) in the data file properties of target bit file
are used to define the read-only or read/write privileges for its file.
The file type that the LCD interfaces with is bit, integer, double integer or float
file specified in the TUF element.
The data protection for a file depends on the LCD edit disable setting. When
LCD Edit Disable is set (1: Checked) in file properties, the corresponding data
file is considered read-only by and the “Protected!” message displays. When
LCD Edit Disable is clear (0: Unchecked), the “UnProtected!” message displays
and the corresponding data file is editable from the LCD keypad.
Feature Address Data Format Type User Program Access
Target User Defined File Number LCD:0.TUF Word (int) Control Read Only
IMPORTANT Use your programming software to ensure that the bit file you specify in
the TUF element, as well as the appropriate number of elements, exist in
the MicroLogix 1400 user program.
IMPORTANT Although you cannot change protected data from the LCD keypad, the
control program or other communication devices do have access to this
data. The Protection bit (LCD Edit Disable) only provides write protection
from the LCD keypad. This does not provide any overwrite protection from
ladder logic, HMI, or programming software. It is the user’s responsibility to
ensure that data is not inadvertently overwritten.
The LCD always starts at bit 0 of a data file. It cannot start at any other address within
the file.