4. Troubleshooting (PROFIBUS DP)
4.2.2.2 Master: Data Link Layer Error
Master Unit LED | Error | Description | ||
BF | ST | |||
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Light | Red | Data link layer | - Nonstandard wiring | |
OFF | Light ON | error | - Noise intrusion | |
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♦Process Flowchart
Check | 6 |
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| Check the following: | Problem exists. (Fix it.) |
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No Problem |
| - Unconnected terminating resistor |
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| - Unconnected or loose connector/signal wire |
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| - Cable disconnection | See 4.2.3.1 and 4.2.3.2. | |
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| No problem |
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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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| Check for noise influence. | The problem is fixed. |
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No Change |
| See 4.2.3.3. | ||
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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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| Consult the PROFIBUS manufacturer. |
| Finish |
124 |
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| Fieldbus I/O Rev.6 |
