[Cause]
Tools respond later than $TLIF.$TLANS_TMOUT [ms] or there is a communication error.
[Countermeasure]
Increase $TLIF.$TLANS_TMOUT, make the tool respond sooner, or check the cable for the tool interface function. When the robot controller sends data to the tool over RS485, note that I/O is updated after the tool responds over RS485. If the tool response is delayed, the I/O update is also delayed.