Output Description

DONE (done)

Data type: BOOL

Output DONE indicates the state of the job processing.

After completing or aborting the processing (due to an error), DONE is set to TRUE for one cycle. For that reason, the output always has to be considered together with output ERR. If ERR is TRUE, an error occurred. In this case, the error number can be read at output ERNO.

ERR (error)

Data type: BOOL

Output ERR indicates whether an error occurred during the Function Block processing.

This output always has to be considered together with output DONE. If DONE is TRUE and ERR is TRUE, an error occurred. In this case, the error number can be read at output ERNO.

ERNO

Data_Type	Default_Value	Range	Unit
WORD	-	0 … 65535	-

At output ERNO the identifier of an occurred error is provided. It is only valid when DONE and ERR is TRUE (see, error messages): Error Messages of the Function Block Libraries

DATA_LEN (data length)

Data type: BYTE

Output DATA_LEN displays the length (in bytes) of the output data read by the slave.

DATA_LEN is only valid, if DONE is TRUE and ERR is 0. If DATA_LEN contains a value X which is not 0, the Function Block has stored X bytes of output data in the variable specified at DATA.

Example

If DATA is a byte array with start index 1, the valid output data of the slave are contained in the entries DATA[1] to DATA[X].