Trim pot configuration in lcd function file, Error conditions – Rockwell Automation 1766-Lxxxx MicroLogix 1400 Programmable Controllers User Manual User Manual
Page 149
Rockwell Automation Publication 1766-UM001H-EN-P - May 2014
107
Using the LCD Chapter 5
TMIN and TMAX indicate the range of data value for the trim pots, both
POT0 and POT1. The factory default for TMIN, TMAX, and POT0
values are 0, 250, and 0 in decimal, respectively. TMIN and TMAX on this
screen are read only, but you can change them using the LCD Function
File in your application program. The TMIN and TMAX elements can
only be changed by a program download.
For more information on how to change Trim Pot configuration including
TMIN and TMAX, refer to the LCD Function File described in the
MicroLogix 1400 Programmable Controllers Instruction Set Reference
Manual, publication
.
When you enter this screen, the last digit of the POT0 value is flashing. It
indicates the current digit. Press the Up and Down keys on the LCD
keypad to change the value of the current digit. Press the Left and Right
keys to select a different digit as the current digit.
If the Key In mode is set to Continuous, the changes are applied
immediately after you press the Up and Down keys. While, if it is set to
Discrete, you have to press the OK key to apply the changes after you
change the data value. For more information on how to set the Key In
mode,
see Changing Key In Mode on page 92
.
5. If you have finished changing the data value of the selected trim pot, POT0
in this example, press the ESC key to return to the Trim Pot Select screen,
as shown in
.
Trim Pot Configuration in LCD Function File
The configuration for Trim Pots in the LCD Function File, including trim pot
low and high values for data value range, is described in the
MicroLogix 1400
Programmable Controllers Instruction Set Reference Manual, publication
Error Conditions
Error conditions regarding the Trim Pot functionality are described in the
MicroLogix 1400 Programmable Controllers Instruction Set Reference Manual,
publication
.
IMPORTANT
The same TMIN and TMAX values are used for both trim pots, POT0
and POT1. This behavior is intended by design for simplicity in Trim
Pot configuration.
TIP
The Key In mode has an effect only when you change the data value
of a trim pot on a Trim Pot screen, either the Trim Pot 0 or Trim Pot 1
screen.