Alternative Branches

Several SFC branches can be alternative. The mark of alternative branches on the chart is a single horizontal line. Every alternative branch begins and ends with its transition condition. Check for alternative conditions is performed from left to right. If the true condition is found, other alternative branches are not considered. In alternative branches, only one branch operates. That's why its end denotes transition to the next step after alternative group.

In this example, alternative Stop is evaluated first. MoveDown and MoveUp steps have a chance of being active if only Stop equals FALSE.

While creating alternative branches, it is preferable to assign exclusive conditions. In this case, error rate during analysis or chart updating is significantly lower.

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