This function block is used to finish a sequence control. It is a special form of the Step function block.
A token that comes to a Stop block cannot be transferred to another block. Only by a preset the Stop block can lose a token at runtime. With the Preset function block the flow control is set to a predefined state and so a token will be detracted from every step, including a Stop block.
The function block has the input SI and the output SM. The output SM is a BIT data type. It shows if this block has a token or not. SI has to be connected with a transition. Over this transition the token will be transferred to this block.
For general information about sequence function and its realization see introduction.
If this function block is currently active, the symbol will be depicted in green.
All flow controls within a structure block are part of the same flow control net. A macro block can be a part of a flow control. For connecting a macro with a flow control block, use the connectors of type TOTRANS or TOSTEP.