Rockwell Automation 1763 MicroLogix 1100 Programmable Controllers User Manual - Manual (Page 114)

Publication 1763-UM001D-EN-P - March 2011
112 Using the LCD
The example table below shows how the LCD uses the configuration
information with bit file number 3 (LCD:0.TBF=3).
The bit number displayed on the LCD corresponds to the data address as
illustrated in the table. The protection bit defines whether the data is editable
or read-only. When the protection bit is set (1), the corresponding data address
is considered read-only by the LCD. The “Protected!” message is displayed
whenever a read-only element is active on the LCD. When the protection bit is
clear (0) or the protection bit does not exist, no additional message is displayed
and the data within the corresponding address is editable from the LCD
keypad.
Bit Number Data Address Protection Bit Bit Number Data Address Protection Bit Bit Number Data Address Protection Bit
0 B3:0/0 B3:3/0 16 B3:1/0 B3:4/0 32 B3:2/0 B3:5/0
1 B3:0/1 B3:3/1 17 B3:1/1 B3:4/1 33 B3:2/1 B3:5/1
2 B3:0/2 B3:3/2 18 B3:1/2 B3:4/2 34 B3:2/2 B3:5/2
3 B3:0/3 B3:3/3 19 B3:1/3 B3:4/3 35 B3:2/3 B3:5/3
4 B3:0/4 B3:3/4 20 B3:1/4 B3:4/4 36 B3:2/4 B3:5/4
5 B3:0/5 B3:3/5 21 B3:1/5 B3:4/5 37 B3:2/5 B3:5/5
6 B3:0/6 B3:3/6 22 B3:1/6 B3:4/6 38 B3:2/6 B3:5/6
7 B3:0/7 B3:3/7 23 B3:1/7 B3:4/7 39 B3:2/7 B3:5/7
8 B3:0/8 B3:3/8 24 B3:1/8 B3:4/8 40 B3:2/8 B3:5/8
9 B3:0/9 B3:3/9 25 B3:1/9 B3:4/9 41 B3:2/9 B3:5/9
10 B3:0/10 B3:3/10 26 B3:1/10 B3:4/10 42 B3:2/10 B3:5/10
11 B3:0/11 B3:3/11 27 B3:1/11 B3:4/11 43 B3:2/11 B3:5/11
12 B3:0/12 B3:3/12 28 B3:1/12 B3:4/12 44 B3:2/12 B3:5/12
13 B3:0/13 B3:3/13 29 B3:1/13 B3:4/13 45 B3:2/13 B3:5/13
14 B3:0/14 B3:3/14 30 B3:1/14 B3:4/14 46 B3:2/14 B3:5/14
15 B3:0/15 B3:3/15 31 B3:1/15 B3:4/15 47 B3:2/15 B3:5/15
IMPORTANT
Although the LCD does not allow protected data to
be changed from its keypad, the control program or
other communication devices do have access to this
data. Protection bits only provide LCD write
protection. They do not provide any overwrite
protection to data from ladder logic, HMI, or
programming software. It is the users responsibility
to ensure that data is not inadvertently overwritten.
TIP
• Remaining addresses within the target file can be
used without restrictions (addresses B3:6/0 and
above, in this example).
• The LCD always starts at bit 0 of a data file. It
cannot start at any other address within the file.