5X00226G02 I/O接口单元模块可编程式控制器

5X00226G02 I/O接口单元模块可编程式控制器

PLC的用户程序由若干指令组成，这些指令在存储器中按步骤号的顺序排列。当没有跳转指令时，CPU从该指令到用户程序结束，逐个执行用户程序。当执行指令时，从输入图像寄存器或其他组件图像寄存器中读取相关编程元素的O/1状态，并根据指令的要求执行相应的逻辑运算，并将运算结果写入相应的组件图像寄存器。因此，每个编程元件（除了输入图像寄存器)的图像寄存器的内容随着程序的执行而改变。

在输出处理阶段，CPIT将输出图像寄存器的O/1状态传送到输出锁存器。当梯形图中输出继电器的线圈"通电"时，相应的输出图像寄存器处于1状态。信号被输出模块隔离和放大后，继电器型输出模块中相应硬件继电器的线圈通电，其常开触点闭合，从而外部负载通电运行。

如果梯形图中输出继电器的线圈"断电"，则相应的输出图像寄存器处于O状态。在输出处理阶段之后，继电器型输出模块中相应硬件继电器的线圈断电，其常开触点断开，外部负载断电，操作停止。

5X00226G02 I/O接口单元模块可编程式控制器
The user program of a PLC consists of several instructions, which are arranged in the sequence of step numbers in the memory. When there is no jump instruction, the CPU executes the user program one by one from the instruction to the end of the user program. When the instruction is executed, the O/1 state of the relevant programming element is read from the input image register or other component image register, and the corresponding logical operation is performed according to the requirements of the instruction, and the operation result is written into the corresponding component image register. Therefore, the contents of the image register of each programming element (except the input image register) change as the program is executed.

During the output processing phase, CPIT transmits the O/1 status of the output image register to the output latch. When the coil of the output relay in the ladder diagram is "energized", the corresponding output image register is in the 1 state. After the signal is isolated and amplified by the output module, the coil of the corresponding hardware relay in the relay-type output module is energized, and its normally open contact is closed, so that the external load is energized.

If the coil of the output relay in the ladder diagram is "powered off", the corresponding output image register is in the O state. After the output processing stage, the coil of the corresponding hardware relay in the relay-type output module is powered off, its normally open contact is disconnected, the external load is powered off, and the operation stops.

5X00226G02 I/O接口单元模块可编程式控制器