4. Troubleshooting (DeviceNet)
4.1.2.5 Absent Slave
Master Unit LED
MS NS Error Description
Light
OFF
Green
Light
Blinking
Absent slave
- No slave (Error detection before
communication establishment)
- Communications power supply OFF
♦ Process Flowchart
8
No Problem
Check
Check the following:
- Unconnected terminating resistor
- Unconnected or loose connector/signal wire
- Cable disconnection
Finish
No Problem
No Problem
No Problem
Problem exists. (Fix it.)
Problem exists. (Fix it.)
Problem exists. (Fix it.)
Problem exists. (Fix it.)
No problem
No problem
No problem
No problem
Measure voltage of
communications power supply
at the master unit.
Check that power is supplied to all slaves.
Check for master unit configuration.
Replace the master unit.
See 4.1.3.1 and 4.1.3.2.
94 Fieldbus I/O Rev.6