7–13
Chapter 7 – RUN Mode and Errors
GLC2400/2500/2600 Series User Manual
7.3.3 No GLC/Host Communication
When the GLC will not communicate with the host PLC, follow the flowchart
below to find both the cause of the problem and a suitable response.
Or, if an error message displays on the screen, check the error code to find the
appropriate solution.
NO
YES
Disconnect all the cables except the
power cable and turn the unit ON.
For
RS-422
, use the solutions
provided in the dotted rectangle,
above.
NO
NO
YES
YES
Does not communicate
Unplug the GLC unit’s power cord
Has
the correct PLC protocol
(Table file) been
selected?
Is the
SIO cable attached properly
to this unit?
Is the
Termination Resistor correctly
installed?
Setup the protocol that corresponds
with the connected PLC.
Device/PLC Con-
nection Manual (included with
the screen creation software)
Attach the SIO cable unit properly,
making sure all connections are
secure.
Device/PLC
Connection Manual (included
with the screen creation software)
Install the Termination Resistor in
the correct position with the correct
values. Resistor position and values
change with each PLC type.
When using the
Direct Access format, refer to the
Device/PLC Connection Manual
(included with the screen creation
software)
Section 7.4 – “Error Messages”