4. Troubleshooting (PROFIBUS DP)
♦Process Flowchart
Check for cable laying.
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Check that | Problem exists. |
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terminating resistors |
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(Add terminating resistors.) | |||||
are connected. | |||||
| Normal |
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Turn OFF all units. |
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Measure resistance |
| Out of 100 to 120 Ω (Error) |
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with tester. |
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100 to 120 Ω |
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| Resistance: over 120 Ω | No |
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| Yes |
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See 4.2.3.2. |
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| Resistance: under 100 Ω | ||||||
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| Remove one terminating | ||||||
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| resistor on either side. |
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| 10 to 100 Ω | |||
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| Check for | connection | ||
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| Approx. | Measure | of terminating resistors. | ||||||||
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| (1) Three | or | more | ||||||||
| 220 | Ω | resistance at | |||||||||
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| connectors | terminating resistors | |||||
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| with tester. | (2) Wrong | terminating | ||||
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| resistors, etc. |
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Other
Find the trouble point.
(1)Unconnected or loose connector
(2)Cable disconnection, etc.
Under 10 Ω
Check for short circuit between signal wires.
Short circuit between signal wires
Fieldbus I/O Rev.6 | 131 |
