Problems with communication with connected devices
Maintenance/Troubleshooting
1-68
After the communication speed is changed, the project file must be transferred again.
You also need to change the communication speed of the connected devices accord-
ingly.
Is the communication line affected by noises?
Cause
If the communication line is affected by noises, the communication appears to slow
down because it is interrupted frequently.
Solution
Monitor the value of the communication time and check the communication line to con-
firm whether the communication line is affected by noises.
1
Monitoring the value of the communication time (communication cycle time)
Monitor the value of the communication time (communication cycle time) stored in
the LS Area in the GP. The communication time (communication cycle time) is stored
in LS9400 of the LS Area in the unit of ms.
(1) Open the project file currently being used, and place the Data Display specifying LS9400 on
all screens.
(2) Transfer the project file to the GP again.
(3) Monitor this value on the GP screen. If the value of LS9400 increases at specific occasions,
a communication error is occurring due to noises or other causes.
Continued
• The range of the available communication speed varies depending on the
connected device. For the communication speed of the connected device, see
the GP-Pro EX Device/PLC Connection Manual.
• Since the value of LS9400 cannot be monitored from the
connected device, place the Data Display.
50
2000
LS9400
LS9400
