Notes On Using Actual Operands; Relationship Between The Parameter Tbit And The Current Checkback Signals; General - Siemens SIMATIC S5 Manual

The Standard Function Block FB164
6.2.5

Notes on using Actual Operands

The designations STAR (1 ,Bl), STOP (1 ,Bl), VORW (1 ,Bl), RUCK (1 ,Bl), UEBN (1 ,Bl) and PAFE
The designations BTR (Q,BY), MFKT (Q,BY), RMLD (Q,B~ and ANZG (Q,D) orANZl (Q,W) and
When specifying data bytes, data words or a data double word, the information is stored in the
axis data block. Make sure that the axis data area for a particular axis is not overwritten.
6.2.6

Relationship between the Parameter TBIT and the current Checkback Signals

6.2.6.1

General

FB 164 signals a currently active job it has started on the IP247 (BA 1...17) at parameter output
is processing a job. The job finished bit is still set at this point. If the IP247 terminates the job it-
self, it sets the job finished bit, and possibly also the position reached bit, but it does not directly
affect the TBIT. The TBIT is then reset by FBI 64, when the IP247 informs it that the job is
finished. This means that you receive the message that the job has been completed in the same
cycle after exiting FB1 64. The job finished bit or the position reached bit has already been set at
this time.
If a job is so short that the job finished bit is reset and set again during a PC cycle, it is not
possible to detect the acceptance and completion of a job from this bit. Even in this case, the
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