The most basic idea of ​​the sequential control design method of Siemens plc is to divide a work cycle of the system into several sequential stages, which are called Steps. Sequential Function Charts (SFCs) consist primarily of steps, directed wiring, transitions, transition conditions, and actions.
Figure 1 is a schematic diagram of the conveyor belt control and input and output waveform diagrams. Press the start button I0.0, first start the No. 1 conveyor belt, and automatically start the No. 2 conveyor belt after 6s delay. After pressing the stop button I0.1, stop the No. 2 conveyor belt first, and automatically stop the No. 1 conveyor belt after 5 seconds. Figure 2 is a sequential functional diagram drawn in the S7-Graph language of the S7-300.
The working process of the conveyor belt is “naturally†divided into 3 steps of 6s start delay, dual machine operation, 5s stop delay (see S2~S4 in Fig. 2), and an initial step S1 waiting for starting is also set. The initial step is indicated by a double-line box.
When the system is in the stage of a certain step, the step is called "active step". The active step is indicated in green during monitoring.
The box to the right of each step is the "action" to be completed in this step. R, S in the action indicates reset and set to Q4.0, and D in step S2 indicates delay, but does not use a timer to delay. When the 6s delay expires, M0.3 changes to the 1 state.
In step S3, N indicates that Q4.1 is a non-storage type operation, S3 is an active step, Q4.1 is a 1 state, and when an inactive step is Q4.1, a state is 0.
The adjacent two steps are connected by a directed connection. Use a dash that is perpendicular to the directed line on the directed wire to indicate the transition.
The signal that causes the system to enter the next step from the current step is called a transition condition. For example, the start button I0.0 is a transition condition from the initial step to the start delay step. S7-Graph uses ladder diagrams or function block diagrams to represent conversion conditions.
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