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Troubleshooting
9-23
SIMATIC 545/555/575 System Manual
9.9 Checking PROFIBUS-DP Cable Installation
Verify the PROFIBUS-DP system cable installation using the following
guidelines:
Inspect system terminations (too many, not enough or incorrect
placement.) See Section 6.3 for proper placement of termination
connectors.
Check for a short in the cable with an ohmmeter.
Check for an open circuit in the cable between the point of
measurement and one or both of the termination resistors with an
ohmmeter.
Line-to-shield resistance that is generating errors may be caused by one of
the following situations.
One of the 9-pin connectors is connected to an RBC or CPU.
Cable line wires are shorted to the shield.
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