Allen-Bradley MicroLogix 1400 User Manual page 115

Rockwell Automation Publication 1766-UM001I-EN-P - June 2015
Valid file type include Bit, Integer, Double integer or Float, as specified in the
TUF element.
Use your programming software to ensure that the integer file you
IMPORTANT
specify in the TUF element, as well as the appropriate number of
elements, exists in the MicroLogix 1400 user program.
The example table below shows how the LCD uses the configuration
information with integer file number 7 (LCD:0.TUF=7).
The data protection for its file depends on the setting for LCD Edit Disable. If
LCD Edit Disable is set to 1 in file properties, the corresponding data file is
considered read-only by the LCD and the "Protected!" message is displayed.
Although you cannot change protected data from the LCD keypad, the
IMPORTANT
control program or other communication devices have access to
protected data. Protection bits do not provide any overwrite
protection to data within the target integer file. It is entirely the user's
responsibility to ensure that data is not inadvertently overwritten.
The LCD always starts at word 0 of a data file. It cannot start at any
TIP
other address within the file.
For explanations in this section, we assume the following in the application
program:
• An integer file N7, which is 256 elements long (256 words), is defined with
the preset data, as shown in the screen capture below.
Using the LCD Chapter 5
101