Sercos III allows unavailable AT data from a slave for one cycle.
This is called single cycle data loss.
This can happen in two directions.
The MDT can be lost before the slaves receive it.
In this case, the Sercos III bus interface (TM5NS31) sets the C1D error bit in its status word.
In addition, the DiagnosticNumber (S-0-0390) parameter (see SCP) in the bus interface is set to 0xC30E4001.
This leads to a message logger entry in the controller: 8163 SERCOS Slave C1D error detected with extended message.
The AT can be lost before the Sercos III master receives it.
If this occurs, the input values of the module are not up-to-date for one cycle.
A single cycle data loss in this case is detected and can be read in the parameter InputsValid of the Sercos III bus interface (TM5NS31).
For more details, refer to Single cycle data loss (during touchprobe).