Output Description

DONE   BOOL \    (done)

Output DONE indicates the state of job processing. After completion or abortion of 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   BOOL \    (error)

Output ERR indicates whether an error occurred during Program 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   WORD \    (error \ number)

Output ERNO provides an error identifier if an invalid value was applied to an input or if an error occurred during job processing. ERNO always has to be considered together with the outputs DONE and ERR. The value output at ERNO is only valid if DONE is TRUE and ERR is TRUE. The error messages Error Messages of the Function Block Libraries encoding at output ERNO is explained at the beginning of the Function Block description.

NUM_CYCLES   DWORD \    (number \ of cycles)

Output NUM_CYCLES displays a counter of the number of times the current task has completed a cycle. The number is reset to 0 on PLC STOP, download of new user program or reset of the PLC.