Publication 1766-RM001A-EN-P - October 2008
538
LCD - LCD Information
LCD Display Operation Error Bit (ERR) bit indicates whether there is a
Trimpot range error at each program download. Whenever a program is
downloaded, the controller compares the old Trimpot values (POT0 and
POT1) with the new Trimpot range (TMIN to TMAX) and sets (1) ERR bit
if an error is found and resets (0) if no error is found.
For example, if old POT0 =100, new TMIN=200 and TMAX=50, controller
sets (1) ERR bit. This means a Trimpot range error has occurred at
program download.
For more information about Trimpot functionality, refer to Using Trim
Pots described in the
MicroLogix 1400 Programmable Controllers User
Manual
, publication
.
LCD Module Operation Error Number (ERN)
LCD Module Operation Error Number (ERN) shows the error code when
an error occurs in LCD configurations and operation.
Target User Defined File Number (TUF)
Target User Defined File Number (TUF) specifies the data file number to
monitor on the LCD. If the data type to display is not System Status, Bit,
Integer, Long Integer or Floating, the controller displays the "Not S/B/N/L/
Feature
Address
Data Format
Type
User Program
Access
ERN - LCD Module
Operation Error Number
LCD:0.ERN
word (INT)
status
read-only
LCD Error Codes
Error Code
Name
Description
0
None of Error
Normal condition
1
Trimpot Hardware fault
The retentive trim pot(s) value crashed by
external failure as like battery fault error.
2
Trimpot Range Over
The Trimpot range of new program is range over.
Feature
Address
Data Format
Type
User Program
Access
TUF - Target User Defined
File Number
LCD:0.TUF
word (INT)
control
read-only
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