User manual

7–7
Chapter 7 – RUN Mode and Errors
LT Series User Manual
YES
NO
NO
NO
7.2.3 No LT / Host Communication
When the LT will not communicate with the host external device, use the follow-
ing flowchart to find both the cause of the problem and a suitable response.
If an error message displays on the screen, check the error code to find the appro-
priate solution.
Section 7.4 – “Error Messages”
YES
Set up the protocol that corresponds
with the connected external device.
LT Editor Device
Connection Manual (included
with the LT Editor software) and
GP-PRO/PBIII Device/PLC
Connection Manual
Disconnect all cables except the
power cable, and turn the unit ON.
For an RS-422 cable, use the solu-
tions provided in the double-lined
rectangle above.
Install the Termination Resistor in
the correct position with the
correct values. Resistor position
and values change with each
external device type.
When using the
Direct Access format, refer to the
LT Editor Device Connection
Manual (included with the LT
Editor software) and GP-PRO/
PBIII Device/PLC Connection
Manual.
Unable to communicate
YES
Unplug the LT unit’s power cord
Has the
correct external device
protocol (Table file) been
selected?
Attach the SIO cable unit properly,
and be sure all connections are
secure.
LT Editor Device
Connection Manual (included with
the LT Editor software) and GP-
PRO/PBIII Device/PLC Connec-
tion Manual
Is the SIO cable
attached properly to
this unit?
Is the
Termination Resistor
correctly installed?