4. Troubleshooting (DeviceNet)
♦Process Flowchart
Check | 5 |
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| Check the following: |
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| - Unconnected terminating resistor | Problem exists. (Fix it.) |
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No Problem |
| - Unconnected or loose connector/signal wire |
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| - Cable disconnection | See 4.1.3.1 and 4.1.3.2. | |
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| No problem |
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No Problem |
| Measure voltage of | Problem exits. (Fix it.) |
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| communications power supply. |
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| No problem |
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No Change |
| Replace the master unit. | The problem is fixed. |
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| No change |
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No Change |
| Replace moving cable | The problem is fixed. |
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| (Replace deteriorated cable). |
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| No change |
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No Change |
| Check for noise influence. | The problem is fixed. |
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| See 4.1.3.3. | |
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| No change |
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The trouble unit is not found. |
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| Rarely | Does an error occur immediately? |
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| Immediately |
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| Divide the network and | The unit is found. |
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| find the trouble unit. |
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| The unit is not found. | Replace the unit. |
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| Normal Communication? | Yes |
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| No |
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| Analyze the network with NetMeter. |
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| Consult the DeviceNet manufacturer. |
| Finish |
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Fieldbus I/O Rev.6 | 87 |
