445 Publication 1763-RM001C-EN-P - October 2009
Chapter
22
LCD - LCD Information
This chapter describes how to use the LCD functions.
LCD Overview
Through the embedded LCD, your MicroLogix 1100 lets you monitor bit
and integer data within the controller, and optionally modify that data, to
interact with your control program. Similarly to the optional 1764-DAT for
the MicroLogix 1500 controllers, the embedded MicroLogix 1100 LCD
allows users access to 48 bits and 48 integers, each of which can be
individually protected. Need to know the speed of a conveyor, the status
of a remote sensor, or how close your process is running relative to its
optimal temperature. Just monitor your LCD. Need to manually start an
operation, change a timing sequence, or make adjustments to a counter.
Why use your laptop and programming software when the LCD allows
you to simulate pushbuttons or numeric entry devices. By simply moving
or copying data in and out of the bit and integer files, you now can
monitor and modify the parameters that your controller uses.
Making use of the new MicroLogix 1100 “LCD Instruction”, your controller
can directly interface with a local operator using your ladder logic. The
LCD Instruction executes under two modes of operation, the first mode
being ladder logic output to the display only (hereafter called “Display
Only mode”). In this Display Only mode, up to three lines of data, with
up to 12 characters per line, can be sent to the display from the ladder
logic running in the controller. Think of this as simply messaging to the
LCD. These lines can consist of combinations of Bits, Integers, and String
characters. So now the control program can send alert/alarm messages, I/
O data values, simple text messages, or combinations of these messages
to the operator. These messages can be triggered by events (input
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