[Cause]
Communication failed.
[Countermeasure]
1 Move the robot to a position where it will not come into contact with the target.
2 Reconnect power. When an alarm occurs again, take the countermeasures in step 3.
3 Confirm whether the sensor cable is connected correctly and whether it is disconnected. If an alarm still occurs even after doing this, take the countermeasures in step 4.
4 Please replace the main board of the R-30iB control unit. If an alarm still occurs even after doing this, take the countermeasures in step 5.
5 Replace the sensor head.