Splitting transition

This function block is used to fork a sequence control into two simultaneous chains.

This function block has the inputs SB, TI and the outputs TO, TO1. If the transition condition is fulfilled, i.e. SB is set to HIGH, the transition allows the passing of a token from a Step connected to TI down to both Steps connected to the outputs TO and TO1. Both steps will get separate tokens and are processed parallel.

If no signal is connected to input SB, the transition always allows the passing of tokens.

TI, TO and TO1 have to be connected. Otherwise the download to the target system will be disrupted with an error message.

For general information about sequence function and its realization see introduction.


Name I/O Type(s) Function
TI I TOTRANS Sequence input
SB I BIT Passing condition
TO O TOSTEP Sequence output
TO1 O TOSTEP Sequence output


If the transition is not connected properly, the symbol will be depicted red in the run mode.


The function block Joining transition can be used for joining two simultaneous chains.