Output Description

DONE

Data type: BOOL

Output DONE indicates the processing state of the Function Block. After completion or abortion of processing (due to an error), DONE is set to TRUE, for one cycle, as long as input EN = TRUE.

This output always has to be considered together with output ERR. If ERR is TRUE, then the corresponding error code is displayed by output ERNO.

ERR (error)

Data type: BOOL

Output ERR indicates, whether an error occurred during control processing. In case of error, the error number can be read at output ERNO.

ERNO (error number)

Data type: WORD

Output ERNO provides an error identifier, if an invalid value was applied to an input, or if an error occurred during request processing. Then the error number is displayed at the output (see, error messages: Error Messages of the Function Block Libraries

Output ERNO always has to be considered together with output ERR. The value output at ERNO is only valid, if output ERR is TRUE.

BUSY

Data type: BOOL

Output BUSY stays TRUE, till the processing of the Function Block is in progress. Once the processing is done, output BUSY becomes FALSE and output DONE becomes TRUE. In the course of output ERR=TRUE, or the input EN=FALSE, output BUSY becomes FALSE.