Rockwell Automation 1766-Lxxxx MicroLogix 1400 Programmable Controllers User Manual - Manual (Page 111)

Rockwell Automation Publication 1766-UM001H-EN-P - May 2014 69
Using the LCD Chapter 5
2. Then, press the OK key on the LCD keypad. The I/O Status screen is
displayed, as shown below.
3. If you have finished viewing I/O status, press the ESC key 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.
To monitor the bit file on the LCD, 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 to 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 is displayed. When
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.