Beijer Electronics NA-9379 - Manual (Page 57)

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MODBUS Programmable I/O NA-9379 FnIO S-Series
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8.2. How to diagnose when device couldn’t communicate network
Inspection of wrong or omission cable connection.
- Check status of cable connection for each node.
- Check that all color matches between connector and cable.
- Check wire omission.
Terminator resistor
- If terminator resistor is not installed, install terminator resistor
- Check location of terminator resistor
Configuration of Node address
- Check duplication node address.
Configuration of Master
- Check configuration of master
- Check whether to do download or don’t
- Check composition is right
Configuration of communication baudrate
I/O size
Configuration of each node
Ground and environment
- Check ground is contacted
- Check environment factor (temperature, humidity, etc.) is in less than regular limit