PR6423/012-100 CON011传感器

PR6423/012-100 CON011 振动传感器

产品详情资料

PLC的SFC程序设计方法：
(1)用SFC进行顺序动作的编程是SFC较基本的用途， 也是相对简单的，只需写出机械动作的工序图，进行状态分配，然后根据转移条件的顺序、并行或选择画SFC图，再将SFC改画成梯形图就可以了。
(2)SFC不只是可以用于对顺序的机械动作进行编程，也可以用于一般的逻辑编程，尤其是在分支判断比较复杂的情况下，采用SFC编程可使问题大大减化。例如在电梯控制中，如电梯正在上行，要判断下一层是否要停的流程，如图1示，其中的逻辑判断是比较复杂的，若采用基本逻辑 指令进行编程，则程序很复杂，包含很多跳转，程序的阅读、检查都很费劲，但若采用SFC编程则轻松多了，根据流程图可直接 写出图2所示的具有选择性分支的SFC流程。
在图2中，在状态S33中判断下一站厢内有无下梯的， 在状态S22判断下一站厢外有无呼上，S24判断下一站厢外有无呼下，S26判断以下各站有无呼梯，根据具体情况转入相应处理，可以进一步很容易地写出步进梯形图，很方便进行调试与检查。

(3)在控制逻辑比较复杂的情况下，有时用一个SFC流程很难进行编程，这时可以在一个程序中使用多个独立的SFC流程，还可进行子程序调用等。例如图3给电梯控制的梯形图程序结构，图中子程序P0完成信号的采集与显示 ：以S0为起始状态的SFC流程进行上下行判断，判断的结果存放在M500和M502中，上行M500接通，下行M502接通;S1开始的SFC流程进行上 行处理;S2开始的SFC流程进行下行处理。
(4)在具有多个独立的SFC流程的程序中，一个SFC结束后可能返回本SFC的初始状态，也可能退出该SFC进入别的流程。对于要返回本SFC初始状态的情况则比较简单，当较后一个状 态结束后置位(输出)其初始状态即可;对于要退出该SFC的情况，只须在较后一个状态结束后，该状态。以电梯控制系统的上行处理为例，在上行过程中，若下一站需要停，且停后上行过程结束，则退出该SFC流程;若下一站需要停，但停后上行过程并未结束，则返回S1;若下一站不需要停，则电梯继续上。SFC流程结束**用RET指令返回主母线。
电气ECS系统，其主要作用是发电机的启、停控制及逻辑;厂用电系统各开关的控制及逻辑;电气系统的各参数与设备状态的监视;继电保护动作情况、故障报警及时间顺序记录。

英文产品详细信息

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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