No Gp/Host Communication - Digital Electronics Pro-face GP-377 Series User Manual

Chapter 6 - GP RUN Mode and Errors

6.2.3 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.
Disconnect all the cables except the
power cable and turn the unit ON
GP-377 Series Users Manual
Does not communicate
Unplug the GP's power cord
Has the correct PLC
protocol (Table file)
been selected?
YES
Is the SIO cable attached
properly to this unit?
YES
Is the Termination Resis-
tor correctly installed?
YES
Setup the protocol that corresponds
with the connected PLC.
NO
Manual (included with the screen
creation software)
Attach the SIO cable unit properly,
making sure all connections are secure.
NO
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
NO
with each PLC type. When using the
Direct Access format,
PLC Connection
Manual (included with the screen
creation software)
For RS-422, use the solutions pro-
vided in the dotted rectangle, above.
.
PLC Connection
6-7