PROFIBUS: DoubleWord error

What does A00701 mean?

This alarm signals an error within the PROFIBUS double word reference table, which is critical for data exchange. This typically indicates a corruption or inconsistency in how PROFIBUS data is mapped within the drive, potentially leading to incorrect data interpretation.

• Mismatch in the PROFIBUS data length or data type configuration between the master (PLC) and the drive (slave) for double-word (32-bit) parameters.
• Incorrect indexing or mapping of PROFIBUS process data (PZD) in the drive parameters (e.g., P2051, P2053) relative to the PLC's configuration.
• Data corruption on the PROFIBUS bus due to excessive noise, improper shielding, or termination issues, affecting multi-byte data integrity.
• Firmware incompatibility between the drive and the PROFIBUS master concerning how specific double-word values are processed.
• Faulty internal PROFIBUS interface hardware within the drive, leading to errors in assembling/disassembling double-word telegrams.

Click steps to track your progress.

1. 1

   1. Verify the PROFIBUS process data (PZD) mapping for both send (P2051) and receive (P2053) directions in the drive, ensuring double-word parameters align with the PLC.

2. 2

   2. Compare the data types and lengths configured for PROFIBUS communication in the PLC program with the drive's specifications for each PZD.

3. 3

   3. Inspect the PROFIBUS cable, connectors, and termination resistors (e.g., X101) for proper installation and absence of damage to minimize data corruption.

4. 4

   4. Temporarily simplify the PROFIBUS telegrams to single-word (16-bit) communication (if possible) to isolate the double-word issue.

5. 5

   5. Check for and install any available firmware updates for the drive that address PROFIBUS communication stability or data handling.

6. 6

   6. Utilize a PROFIBUS analyzer to capture and inspect the raw telegram data to identify where the double-word errors are occurring.