7–22
Chapter 7 – RUN Mode and Errors
GLC2400/2500/2600 Series User Manual
When the GLC changes to OFFLINE mode during RUN mode
When the GLC changes to OFFLINE mode without the user first pressing the
screen, there is a possibility that the screen data has been damaged. In this case,
after the SYSTEM ERROR displays, the screen automatically reverts to OFFLINE
mode after about 10 seconds. Run the INITIALIZE MEMORY command and
transfer the GLC screen data again from your PC.
In most cases, system errors are related to the problems mentioned below.
Factors that may cause System Errors
Environment Related Problems
If an error occurs which has no apparent connection to the GLC’s current opera-
tion, the error may be due to the condition of GLC’s operating environment. This
can include noise or electrostatic interference in the power code or the communi-
cation line. In this case you need to check if the power code and the communica-
tion line wiring and FG grounding are correct.
Screen Data or Project Data Related Problems
If an error seems to be caused by a particular GLC operation, the error may be
related to the screen or project data transferred to the GLC. In this case, try send-
ing screen data via the FORCE SYSTEM SETUP feature, which will transfer both
the screen data and the project data to the GLC.
For details about the FORCE SYSTEM SETUP feature, refer to the
“Transfer Settings”
section in the
GLC-PRO/PBIII for Windows
Operation Manual.
GLC-Related Problems
If disconnecting and then reconnecting the power code corrects an error, the
problem may not be related to the GLC unit itself. However, to identify if the GLC
unit has any problems, run the OFFLINE mode’s SELF-DIAGNOSIS program.
Peripheral Equipment-Related Problems (when the GLC is equipped
with a printer I/F)
If an error occurs only during printout, there may be a problem with the printer.
Check the printer cable wiring and the FG line as well as the printer itself.
When a Communication Error Occurs Continuously (when using the
Direct Access method)
If a communication error occurs continuously, the GLC may define the error as a
system error. In this case you need to solve the problem causing the original
communication error.