4. Troubleshooting (DeviceNet)

4.1.2.6 Uninitialized Network

Master Unit LED

MS

NS

Error

Description

Light OFF Light OFF Uninitialized network Absent slave

-Master unit start-up error

-No slave (Error detection before communication establishment)

-Communications power supply OFF

Process Flowchart

Check

9

 

†No Problem

†No Problem

†No Problem

Measure voltage of

communications power supply

at the master unit.

No problem

Check the following:

-Unconnected terminating resistor

-Unconnected or loose connector/signal wire

-Cable disconnection

No problem

Check that power is supplied to all slaves.

Problem exists. (Fix it.)

Problem exists. (Fix it.)

See 4.1.3.1 and 4.1.3.2.

Problem exists. (Fix it.)

No problem

Problem exists. (Fix it.)

† No Problem

Check for master unit configuration.

No problem

Finish

Replace the master unit.

96

Fieldbus I/O Rev.6

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Epson EM07ZS1647F manual Uninitialized Network