Problems with communication with I/O units
Maintenance/Troubleshooting
1-78
Is the “ERR LED” illuminating?
Cause
If the “ERR LED” illuminates, the communication may not be established due to any of
the following improper network settings:
• Transmission path is broken.
• The master cannot be used.
• The electric power is not supplied.
• Master’s I/O communication size setting and GP’s disagree.
• Master’s slave address setting and GP’s disagree.
Solution
Check the error message on the GP screen. Perform the solution and then set the network
properly. For details about the error messages, refer to the following page.
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“1.6.3 Errors displayed with an expansion unit u When the PROFIBUS is used”
(page 1-162)
For the setting procedure, refer to the GP-Pro EX Device/PLC Connection Manual.
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GP-Pro EX Device/PLC Connection Manual
If the “ERR LED” still illuminates after resetting the network, the PROFIBUS (Slave)
Unit may be faulty. Please contact your local GP distributor.
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