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7-12
Chapter 7 - RUN Mode and Errors
GP-2401/2501/2601 Series User Manual
7.3.3 No GP/Host Communication
When the GP 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 (refer to the
Error Messages
section in this chapter) to find the appropriate solution.
Is the SIO cable at-
tached properly to this
unit?
NO
Has the correct PLC
protocol (Table file)
been selected?
NO
Unplug the GP's power cord
YES
NO
Setup the protocol that corresponds
with the connected PLC.
GP-PRO/PBIII for
Windows Device/PLC Connection
Manual (included with the screen
creation software)
Attach the SIO cable unit properly,
making sure all connections are secure.
GP-PRO/PBIII for
Windows Device/PLC Connection
Manual (included with the screen
creation software)
For
RS-422
, use the solutions pro-
vided in the dotted rectangle, above.
YES
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,
GP-PRO/PBIII for
Windows Device/PLC Connection
Manual (included with the screen
creation software)
Does not communicate
YES
Is the Termination
Resistor correctly
installed?
Disconnect all the cables except the
power cable and turn the unit ON.
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