Problems with communication with I/O units
Maintenance/Troubleshooting
1-83
• If the EX module is not properly connected
(1) Turn OFF the LT. Reconnect the extension connector with attention to the connection.
Check if any connector pins are bent or broken before connecting.
(2) If the communication still fails with the EX module after performing the solution above,
select [Peripheral Settings], [I/O Driver], [EXM Driver], and then [I/O Monitor] in offline
mode. If the number and type of the connected module is not displayed, the EX module is
not recognized. The LT or the EX module may be faulty. Please contact your local LT distrib-
utor.
)
“1.7.2 Contact us!” (page 1-164)
Does the communication fail even if no error appears on the Display?
Cause
If [External I/O] is disabled, communication fails. Enable [External I/O] and transfer the
logic program (project file) to the display again.
Solution
In GP-Pro EX, select [Display Unit], [Logic Settings], [External I/O] and then [RUN].
Transfer the logic program (project file).
• For details about the errors other than described above, refer to the following
section.
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