Code bUS (Fault): Option Communication Error

Code type: Fault Manual section: Yaskawa A1000 Troubleshooting No signal received from the PLC. - Check for faulty wiring. - Correct the wiring. - Check for disconnected cables and short circuits. Repair as needed. Faulty communications wiring or a short circuit exists. A communications data error occurred due to noise. - Check the various options available to minimize the effects of noise. - Take steps to counteract noise in the control circuit, main circuit, and ground wiring. - Ensure that other equipment such as switches or relays do not cause noise. Use surge suppressors if necessary. - Use only recommended cables or other shielded line. Ground the shield on the controller side or on the drive input power side. - Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive power supply input. The option card is damaged. - Replace the option card if there are no problems with the wiring and the error continues to occur. The option card is not properly connected to the drive. - The connector pins on the option card are not properly lined up with the connector pins on the drive. - Reinstall the option card.