64FF		4

	Encoder error (mode undetected)
	Though the encoder GA detected an encoder error; however, the encoder does not detect any error.
	1. Check that the FG (frame ground) terminals of the robot and the controller are grounded. 2. Check that the robot and the controller are away from noise source such as a welding machine. 3. Check that the cable between the robot and the controller is firmly plugged.