4. Troubleshooting (DeviceNet)
♦ Causes of Error |
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| Countermeasure | |
| Possible Cause |
| Examination Method | |||||
| { Voltage drop of | Measure voltage of |
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| Check voltage of the power | |||
| communications | communications power supply at | supply. | |||||
| power supply | the master unit. |
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| → Normal: 11V or more between |
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| V+ and V- |
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| z If the voltage is 11 to 14 V, the |
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| unit is a possible cause. Fix the |
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| problem on the unit. |
| Fix the problem. | ||||
| { Disconnected | (1) | Check |
| that | terminating | ||
| terminating |
| resistors are connected to both |
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| resistors |
| ends of the network. |
| How to find the trouble | |||
| { Cable | (2) | Measure | resistance | between | point: | ||
| disconnection |
| signal |
| wires | with | Remove the terminating | |
| { Disconnected |
| communications power supply | resistor on one end of the | ||||
| connector |
| OFF. |
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| network. The trouble point |
| { Disconnected | → Normal: 50 to 70 Ω |
| is where resistance changes | ||||
| signal wire | z Measuring point: Connection of | from 120 Ω. | |||||
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| the master |
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| z For detail, refer to the section |
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| 4.1.3.1 Connection Problem. | Connect the connectors and | |||||
| { Loose connector | Check for the connection of | ||||||
| { Loose signal wire | connectors and signal wires. | signal wires again. | |||||
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| → The connectors and signal |
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| wires should be firmly |
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| connected. |
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| z Checkpoint: Between the master |
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| and its slaves |
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| z For details, refer to the section |
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| 4.1.3.2 Loose Connector and |
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| Signal Wire. |
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| Supply power to the slaves. | ||
| { All slaves power | Measure the power voltage of the | ||||||
| OFF | slaves. |
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| (It should be within the range of |
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| sufficient voltage for the slave |
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| operation.) |
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| Change the configuration. | |
| { Master unit | (1) | Start | applicomIO | Console | |||
| configuration |
| application and check that the |
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| configuration | has | no |
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| difference | with | the | network |
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| condition. |
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| (2) Check | that the configuration |
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| data were written in flash. |
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zFor details, refer to the section 4.1.3.6 EPSON RC+ Master Configuration.
Fieldbus I/O Rev.6 | 95 |
