7–9
Chapter 7 – RUN Mode and Errors
GLC2400/2500/2600 Series User Manual
7.3
Troubleshooting
7.3.1 Possible Types of Trouble
The following items are problems that may occur while using this unit.
(A) No Display
(Section 7.3.2)
The screen will not display even when the GLC unit is powered on. Also,
during RUN mode, the screen disappears.
(B) No GLC/HOST Communication
(Section 7.3.3)
The GLC 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
(Section 7.3.4)
The touch panel does not react when touched, or the reaction time is very slow.
(D) Cannot Execute Logic Program
(Section 7.3.5)
The GLC freezes, or the control memory’s retentive area does not work.
(E) Buzzer Sounds when GLC power is turned ON
(Section 7.3.6)
The GLC unit’s buzzer sounds intermittently when the power is first turned
ON.
(E) Clock Setting Cannot be Entered
(Section 7.3.7)
Even after clock setting are entered, the GLC unit’s clock settings remain
eg)00/01/01
For problems A to F, see the corresponding flowcharts on
Troubleshooting in
Sections 7.3.2 to 7.3.7.
(G) OFFLINE Displays During RUN Mode
The GLC unexpectedly goes to the
OFFLINE
mode while operating, or the
GLC 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 Message Details”
If the GLC 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 GLC to go
OFFLINE
.
For other types of Flex Network problems, refer to the
Flex Net-
work User Manual.
The explanations given here assume the origin of the prob-
lem is the GLC unit. For host (PLC) related problems, refer to
that unit’s Operation Manual.
This section describes how to find and resolve problems that may occur with the
GLC. If a problem exists with the PLC, refer to the corresponding PLC manual.