TC-505-02-4M5 实现对工业设备的自动化控制

Description

TC-505-02-4M5 实现对工业设备的自动化控制

TC-505-02-4M5可编程控制器（PLC）的工作原理可以概括为输入采样、用户程序执行和输出刷新三个阶段。在输入采样阶段，PLC以扫描方式顺序地读入所有输入状态和数据，并将它们存入I/O映象区中的相应得单元内。在用户程序执行阶段，PLC按由上而下的顺序依次地扫描用户程序(梯形图)。在扫描每一条梯形图时，又总是先扫描梯形图左边的由各输入点构成的控制线路，并按先左后右、先上后下的顺序对由触点构成的控制线进行逻辑运算，然后根据逻辑运算的结果，刷新该逻辑线圈在系统RAM存储区中对应位的状态；或者刷新该输出线圈在I/O映象区中对应位的状态；或者确定是否要执行该梯形图所规定的特殊功能指令。即，在用户程序执行过程中，只有输入点在I/O映象区内的状态和数据不会发生变化，而其他输出点和软设备在I/O映象区或系统RAM存储区内的状态和数据都有可能发生变化，而且排在上面的梯形图，其程序执行结果会对排在下面的凡是用到这些线圈或数据的梯形图起作用；相反，排在下面的梯形图，其被刷新的逻辑线圈的状态或数据只能到下一个扫描周期才能对排在其上面的程序起作用。在输出刷新阶段，当扫描用户程序结束后，PLC就进入输出刷新阶段。在此期间，CPU按照I/O映象区内对应的状态和数据刷新所有的输出锁存电路，再经输出电路驱动相应的外设。这时，才是PLC的真正输出。

总的来说，TC-505-02-4M5可编程控制器的工作原理是通过不断地循环执行以上三个阶段，实现对工业设备的自动化控制。同时，由于PLC采用了大规模集成电路和先进的生产工艺，具有很高的可靠性和稳定性，因此被广泛应用于各种工业自动化控制系统中。

TC-505-02-4M5 实现对工业设备的自动化控制

Tc-505-02-4the working principle of the M5 Programmable controller (PLC) can be summarized as three stages: input sampling, user program execution and output refresh. During the input sampling phase, the PLC reads all input status and data sequentially in a scan and stores them in the corresponding cell in the I/O map area. In the execution phase of the user program, the PLC scans the user program in sequence from top to bottom (ladder diagram). When scanning each ladder diagram, it always scans the control line composed of input points on the left side of the ladder diagram first, and carries out logical operations on the control line composed of contacts in the order of first left and then right, first up and then down. Then, according to the results of logical operations, the status of the corresponding bit of the logic coil in the system RAM storage area is refreshed. Or refresh the state of the corresponding bit of the output coil in the I/O map area; Or determine whether to execute the special function instructions specified in the ladder diagram. That is, during the execution of the user program, only the status and data of the input point in the I/O image area will not change, while the status and data of other output points and software devices in the I/O image area or the system RAM storage area are likely to change. The results of the program execution will work on the ladder diagram that uses these coils or data listed below; In contrast, in the ladder diagram below, the status or data of the logic coils that are refreshed can only be useful to the program above it until the next scan cycle. In the output refresh stage, when the scanning user program is finished, the PLC enters the output refresh stage. During this period, the CPU refreshes all output latches according to the corresponding status and data in the I/O map area, and then drives the corresponding peripheral through the output circuit. At this time, is the real output of PLC.

In general, the TC-505-02-4M5 programmable controller works by implementing the above three stages in a continuous cycle to achieve automatic control of industrial equipment. At the same time, due to the use of large-scale integrated circuits and advanced production processes, PLC has high reliability and stability, so it is widely used in various industrial automation control systems.