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Getting Value with Keypad
Your application program can get value from user's keypad inputs if
Display With Input bit is set (1) in LCD instructions. User inputs can be
obtained with arrow, ESC, and OK keys. In this case, Line 4 is used for
user input. L4 Source A is used to specify the target file or element to
store user input and the L4 Source B is not used. Where, the data value
range for different file types are as follows:
• Integer file (word): -32,768 to +32,767
• Bit file: 0 or 1
• Long file (double word): -2,147,483,648 to +2,147,483,647
When rung conditions go true, the LCD instruction displays Line 2 and
Line 3 strings and positions the cursor at Line 4. Then, the user can input
a desired value using the LCD keypad. User input is applied when the OK
key is pressed. If the ESC key is pressed, user input is cancelled and no
operation is followed. During user's input with the LCD keypad, Line 2
and Line 3 displays are not updated.
Displaying Special Characters
With the LCD instruction, the LCD screen can display the characters of A
to Z, a to z, 0 to 9, and special characters in the range of ACCII 0x00 to
0xFF.
Be careful that some special characters are substituted with the
corresponding embedded characters in the LCD. The table below shows
the available character set on the LCD. For information on how to
manipulate a string file for display of special characters, refer to your
RSLogix 500 Online Help.
LCD - LCD Information
Publication 1763-RM001C-EN-P - October 2009
455
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