1. Construction principles of SFC program
The SFC program consists of alternating states and transitions, and its essence is state transitions. You can transfer a state to the next state through conditions, transfer conditions to the next state when multiple states are active simultaneously, or activate multiple states simultaneously through conditional transfer.
SFC does not divide the network, the program is a whole. Divide the program into grids, and each grid can only accommodate one component.
SFC does not have a fixed maximum number of components. In principle, the width should not be too large.
There must be an initial step. For scenarios involving multiple initial steps, please derive below this initial step.
It is illegal to jump from one state to another without passing a transition condition. In this situation, please use a normally open contact (such as LD Always_On) to pass through within the transfer conditions.
It is illegal to have one transfer condition adjacent to another transfer condition. In this situation, please combine the logic within the transfer conditions.
A single horizontal line must connect multiple transitions to indicate the selection logic for these transitions.
The double horizontal line must connect multiple states to indicate the synchronization logic for these states.
อ่านเพิ่มเติม
