Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
LCD - LCD Information 541
ESC is set when ESC key is pressed. This bit should be cleared so as to get
the next key input. Because once ESC key is pressed, this bit is set and
latched until it is cleared by manually. This ESC bit is very useful for LCD
instruction. You can use this bit as any input of ladder logic when you
program with several LCD instruction.
LCD Backlight On/Off (BACKON)
LCD Backlight On/Off (BACKON) specifies whether to turn the backlight
on or off. When this bit is set (1), the LCD backlight turns on. Otherwise,
the backlight always off.
LCD Backlight Time (BACKTIME)
LCD Backlight Time (BACKTIME) specifies the backlight timer period.
When this bit is set to zero (0), the default backlight timer period of 30
seconds applies. When set to (1), the backlight is always on.
LCD contrast (CNST)
NOTE
ESC bit is presented for handy interface to LCD instruction and keypad, so it
is just updated in U-DISP screen.
Feature Address Data Format Type User Program
Access
BACKON - LCD Backlight
on/off
LCD:0/BACKON binary (bit) control read/write
Feature Address Data Format Type User Program
Access
BACKTIME - LCD
Backlight timer
LCD:0/BACKTIME binary (bit) control read/write
Feature Address Data Format Type User Program
Access
CNST - LCD Contrast LCD:0/CNST word (INT) control read/write
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes