LS ELECTRIC eXP2 Series, User Manual, Page: 106 / 129

Appendix 1 Troubleshooting
App1-9
5. Communication Problem
Question
It seems that communication does not work
Phenomenon
On the screen where the object is not many, communication works but when you move the
screen where the object is many, timeout occurs.
< Cause >
(1) In the device setting, the communication time-out is set to be too short.
<Solution>
(1) It occurs because timeout is set much smaller than sum of request time of communication data and
response time from PLC. In the device setting at the XP-Builder, after setting communication time out to
be big, download program and execute again.
Question
It seems that communication doesn’t work.
Phenomenon
Communication doesn’t work.
< Cause >
(1) Communication setting or cable may be not normal.
<Solution>
(1) In case of RS-232C, check whether connection setting is normal or not in XP-Builder.
(2) In case of RS-422/485, check whether station and communication connection setting is normal or not.
(3) If 1), 2) is normal, do diagnosis about PLC-RS232C, PLC-RS485/422 at the Serial diagnosis screen of
device menu. Refer to the [Device manual ch.5.6 Serial Communication Diagnosis]
(4) If 3) is normal, check whether connection cable has error or not.
(5) In case of Ethernet, check the port and IP setting about relative PLC.
► Before trial operation of the product, be sure to check if a normal communication is available
between XGT Panel and the subject device of control
Caution