PR6423/012-100 CON011傳感器_廈門阿米控技術有限公司

PR6423/012-100 CON011 振動傳感器

產品詳情資料

PLC的SFC程序設計方法：
(1)用SFC進行順序動作的編程是SFC較基本的用途，也是相對簡單的，只需寫出機械動作的工序圖，進行狀態分配，然後根據轉移條件的順序、並行或選擇畫SFC圖，再將SFC改畫成梯形圖就可以了。
(2)SFC不只是可以用於對順序的機械動作進行編程，也可以用於一般的邏輯編程，尤其是在分支判斷比較復雜的情況下，採用SFC編程可使問題大大減化。例如在電梯控制中，如電梯正在上行，要判斷下一層是否要停的流程，如圖1示，其中的邏輯判斷是比較復雜的，若採用基本邏輯指令進行編程，則程序很復雜，包含很多跳轉，程序的閱讀、檢查都很費勁，但若採用SFC編程則輕松多了，根據流程圖可直接寫出圖2所示的具有選擇性分支的SFC流程。
在圖2中，在狀態S33中判斷下一站廂內有無下梯的，在狀態S22判斷下一站廂外有無呼上，S24判斷下一站廂外有無呼下，S26判斷以下各站有無呼梯，根據具體情況轉入相應處理，可以進一步很容易地寫出步進梯形圖，很方便進行調試與檢查。

(3)在控制邏輯比較復雜的情況下，有時用一個SFC流程很難進行編程，這時可以在一個程序中使用多個獨立的SFC流程，還可進行子程序調用等。例如圖3給電梯控制的梯形圖程序結構，圖中子程序P0完成信號的採集與顯示：以S0為起始狀態的SFC流程進行上下行判斷，判斷的結果存放在M500和M502中，上行M500接通，下行M502接通;S1開始的SFC流程進行上行處理;S2開始的SFC流程進行下行處理。
(4)在具有多個獨立的SFC流程的程序中，一個SFC結束後可能返回本SFC的初始狀態，也可能退出該SFC進入別的流程。對於要返回本SFC初始狀態的情況則比較簡單，當較後一個狀態結束後置位(輸出)其初始狀態即可;對於要退出該SFC的情況，只須在較後一個狀態結束後，該狀態。以電梯控制係統的上行處理為例，在上行過程中，若下一站需要停，且停後上行過程結束，則退出該SFC流程;若下一站需要停，但停後上行過程並未結束，則返回S1;若下一站不需要停，則電梯繼續上。SFC流程結束**用RET指令返回主母線。
電氣ECS係統，其主要作用是發電機的啟、停控制及邏輯;廠用電係統各開關的控制及邏輯;電氣係統的各參數與設備狀態的監視;繼電保護動作情況、故障報警及時間順序記錄。

英文產品詳細信息

SFC programming method for PLC:

(1) The programming of sequential actions using SFC is a basic and relatively simple use of SFC. Simply write the process diagram of mechanical actions, assign states, and draw SFC diagrams based on the order of transfer conditions, parallel or selective, and then change SFC to a ladder diagram.

(2) SFC can not only be used to program sequential mechanical actions, but also can be used for general Logic programming. Especially in the case of complex branch judgment, SFC programming can greatly reduce the problem. For example, in elevator control, if the elevator is moving up, the process of determining whether the next floor needs to stop is as shown in Figure 1. The logic judgment is relatively complex. If basic logic instructions are used for programming, the program is complex, including many jumps, and reading and checking the program is difficult. However, if SFC programming is used, it is much easier. According to the flowchart, the SFC process with selective branches shown in Figure 2 can be directly written.

In Figure 2, in state S33, it is determined whether there is a descent ladder inside the next station car, in state S22, whether there is a descent ladder outside the next station car, in S24, and in S26, the following stations are determined whether there is a descent ladder outside the next station car. Based on the specific situation, the corresponding processing can be carried out, and the step ladder diagram can be easily written for debugging and inspection.

(3) In situations where the control logic is relatively complex, sometimes it is difficult to program with one SFC process. In this case, multiple independent SFC processes can be used in one program, and subroutine calls can also be made. For example, Figure 3 shows the ladder diagram program structure for elevator control. The subroutine P0 in the figure completes signal acquisition and display: the SFC process with S0 as the starting state performs uplink and downlink judgment, and the judgment results are stored in M500 and M502. The uplink M500 is connected, and the downlink M502 is connected; Perform upstream processing on the SFC process starting from S1; The SFC process starting from S2 undergoes downstream processing.

(4) In a program with multiple independent SFC processes, one SFC may return to its initial state after completion, or exit the SFC and enter another process. For situations where the initial state of this SFC needs to be returned, it is relatively simple to set (output) its initial state after the end of the later state; For situations where the SFC needs to be exited, it is only necessary to exit the later state after the end of that state. Taking the uplink processing of the elevator control system as an example, if the next station needs to stop during the uplink process and the uplink process ends after stopping, the SFC process will be exited; If the next station needs to stop, but the uplink process does not end after stopping, then return to S1; If there is no need to stop at the next station, the elevator will continue to ascend. End of SFC process * * Use RET instruction to return to the main bus.

The electrical ECS system, whose main function is to control the start and stop of the generator and its logic; Control and logic of each switch in the auxiliary power system; Monitoring of various parameters and equipment status of the electrical system; Record the action status, fault alarm, and time sequence of relay protection.

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