Siemens PLC

6504 – Communication error

PROFIBUS communication error

Details

Communication fault detected on PROFIBUS network.

Error typeerror
MeaningPROFIBUS error
Typical causesTerminating resistors missing incorrect baud rate cable fault
SolutionsCheck terminating resistors verify baud rate check cable integrity replace defective devices
Severityhigh

Catalog references

Vendor Information

Siemens6504

Utilities

Troubleshooting Steps

Troubleshooting steps

Check terminating resistors verify baud rate check cable integrity replace defective devices

Other codes

Other Siemens PLC Codes

80A0 – Memory error

Memory allocation error

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80A1 – Memory error

Memory error in retentive data area

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80A2 – Memory error

Memory error in work memory

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80A3 – Memory error

Memory error in load memory

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80A4 – Memory error

Memory card error

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FAQ

Common questions

Why are terminating resistors needed?

They prevent signal reflection which causes communication errors on PROFIBUS.