PLC stepping sequence control of the state transfer drawing method

Description of stepping sequence control: a process control can be divided into several stages, these stages are called state or step. Separated by the transformation between state and state conditions. When the transformation between the two adjacent state when the conditions are met, realize the state transition. There is only one state transition to a single process sequence control structure. The state of the FX series PLC controller components every step or in a state element, said S0 as the initial step, also known as a preparation step, said the initial preparation is in place. Other step for work. State element is constitute the basic elements of state transition diagram, is one of the programmable controller of soft components. FX2N 1000 state element, its classification, number, quantity and use as shown in table 1. Table 1 FX2N note: the state of the element (1) state the number must be within the specified range of choice. (2) the contact of each state components inside the PLC controller are free to use, any number. (3) without stepping sequence control instruction, the state element can be used as auxiliary relay in the program. (4) through the parameter Settings, may change the general state of elements and loss of electricity to keep state of address allocation. State transition diagram ( SFC） Drawing a state transition diagram ( SFC） Also calls the function chart. Used to describe the control process of control system. State transition diagram of three elements: drive the action, transfer targets and transfer conditions. One transfer target and transfer of the necessary conditions, but actions are depending on the specific circumstances, or may not have the actual action. Between step and step to the attachment said the direction of the process, among them down and the arrow to the right can be omitted. Figure in the downward direction of the process, and thus to omit the arrow.
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