User manual

7–3
Chapter 7 – RUN Mode and Errors
LT Series User Manual
This section describes how to find and resolve problems that may occur with the
LT. If there is a problem with the external device, refer to the external device’s
corresponding manual.
7.2 Troubleshooting
The following items are problems that may occur while using this unit.
(A)No Display (See Section 7.2.2)
The screen will not display even when the LT unit is powered on. Also,
during RUN mode, the screen disappears.
(B) No LT/HOST Communication (See Section 7.2.3)
The LT unit cannot extract data from the host. An error message may appear
on the screen as a result.
Section 7.4 – “Error Messages”
(C)Touch Panel Does Not Respond (See Section 7.2.4)
The touch panel does not react when touched, or the reaction time is very slow.
(D)Logic Program Does Not Run (See Section 7.2.5)
The LT freezes, or the control memory’s retentive area does not work.
(E) Clock Settings Cannot be Entered (See Section 7.2.6)
Even after clock settings are entered, the LT unit’s clock settings remain
eg.00/01/01.
7.2.1 Possible Problems
For problems A to E, see the corresponding flowcharts on Trouble-
shooting in Sections 7.2.2 to 7.2.6.
(F) OFFLINE Displays During RUN Mode
The LT unexpectedly goes to the OFFLINE mode while operating, or the LT
automatically goes to the OFFLINE mode when the power is turned ON. In
this case, a SYSTEM ERROR may have developed while displaying the
OFFLINE Mode screen.
Section 7.4.2 – “Error Messages Details”
If the LT goes to the OFFLINE mode without displaying an error message when
the power is turned ON, be sure that no object has touched the screen accidentally.
Any object that touches the top-left corner of the screen within 10 seconds after
the power turns ON may cause the LT to go OFFLINE.
For other types of Flex Network problems, refer to the Flex Network
User Manual.