
Troubleshooting
395
Power-up Modes
You can force the controller to enter Bootstrap or Stop mode by turning on the power
supply while pressing specific keypad keys.
Mode M90 M91
Bootstrap
< I > + <
7 >
< I > + < 7 >
Stop (O/S)
Exit Stop Mode by
entering
Information Mode,
and then selecting
System> Reset.
< I > < I >
Communication Log
When you dial a remote modem using U90 Ladder, a window opens up in the bottom of
your screen. The log of events is quickly displayed in this window.
The log also appears during download and upload if there are communication problems.
This log is stored as a .txt file. You can view this log by navigating to
Unitronics\U90_Ladder\U90Ldxxx and opening a file named ComLog.txt.
In this file, the most recent log of events appears last.
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