User manual

7–18
Chapter 7 – RUN Mode and Errors
LT Series User Manual
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 When the LT Changes to OFFLINE Mode during RUN Mode
When the LT changes to OFFLINE mode without the user first touching the screen,
the screen data may be damaged.
Approximately 10 seconds after the SYSTEM ERROR message displays, the screen
automatically reverts to OFFLINE mode. Run the INITIALIZE MEMORY com-
mand and transfer the LT screen data again from your PC.
In most cases, system errors are related to the problems described below.
Environment-Related Problems
If an error’s occurrence has no apparent relation to the LT unit’s current operation,
the condition of the LT unit’s operating environment may be the cause. These
conditions can include noise or electrostatic interference in the power cord or the
communication line. Make sure that the power cord and communication line
wiring, and the FG grounding are correct.
Screen or Project Data-Related Problems
If an error seems to be caused by a particular LT operation, the error may be
related to the screen or project data transferred to the LT. Try to send the screen
data via the FORCE SYSTEM SETUP feature, which then transfers both the
screen data and the project data to the LT.
LT–Related Problems
If disconnecting and then reconnecting the power cord corrects an error, the
problem may not be related to the LT unit itself. To identify any problems with the
LT unit, run the OFFLINE mode’s SELF-DIAGNOSIS program.
Continuously-Occurring Communication Errors (when using the
Direct Access method)
If the LT defines a communication error that occurs continuously as a system
error, you need to solve the problem that originally caused the communication
error.