A33410 — Encoder 3: Communication error (encoder and Sensor Module)

A33410 is raised when the drive detects a transfer error in the serial communication protocol between Encoder 3 and the evaluation module that reads the encoder. The S120/S150 manual titles the code Encoder 3: Communication error (encoder and Sensor Module), the G130/G150 manual Encoder 3: Serial communications; cause and remedy are identical. The code appears here as an alarm — depending on the drive configuration, the same condition can also be issued as a fault (F) or as a message with no reaction (N). The drive stores the concrete reason in the alarm value r2124, which is interpreted binary.

• A serial communication protocol transfer error between Encoder 3 and the evaluation module.

1. Check that the encoder cables are routed in compliance with EMC.
2. Check the plug connections.
3. If the transfer error persists, replace the encoder.

• The message value is the fault cause, output in binary form (Fault cause: %1 bin); the drive holds it in r2124 and each bit set identifies the specific transfer problem:
• Bit 0: Alarm bit in the position protocol.
• Bit 1: Incorrect quiescent level on the data line.
• Bit 2: Encoder does not respond (does not supply a start bit within 50 ms).
• Bit 3: CRC error: The checksum in the protocol from the encoder does not match the data.
• Bit 4: Encoder acknowledgment error: The encoder incorrectly understood the task (request) or cannot execute it.
• Bit 5: Internal error in the serial driver: An illegal mode command was requested.
• Bit 6: Timeout when cyclically reading.
• Bit 8: Protocol is too long (e.g. > 64 bits).
• Bit 9: Receive buffer overflow.
• Bit 10: Frame error when reading twice.
• Bit 11: Parity error.
• Bit 12: Data line signal level error during the monoflop time.

• r2124 — alarm value: read this parameter in binary form; every bit set in it names the specific serial transfer problem behind A33410, as decoded in the list above.

The code is shown here as an alarm. If the drive is configured to raise the same condition as a fault (F), it must be acknowledged immediately once the encoder communication problem has been corrected; the no-reaction variant (N) requires no acknowledgement. No stop reaction is assigned to this code in any variant, so nothing has to be restarted beyond removing the cause.