SCXI-1104C  其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令

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SCXI-1104C  其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令

可编程逻辑控制器（PLC）的工作原理基于一个程序循环，SCXI-1104C这个循环的步骤可以包括捕获输入信号，进行逻辑运算，生成输出信号和等待一个周期的时间。在PLC的循环程序中，输入信号被读取并传输到CPU中，然后通过编程进行逻辑运算。这些逻辑运算可以包括布尔运算、算术运算和比较运算等等。根据编程的要求，PLC会生成输出信号，并将它们发送到I / O模块，然后控制外部的执行设备。

当可编程逻辑控制器投入运行后，其工作过程一般分为三个阶段，即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在整个运行期间，SCXI-1104C可编程逻辑控制器的CPU以一定的扫描速度重复执行上述三个阶段。

可编程逻辑控制器（PLC）是一种专门为在工业环境下应用而设计的数字运算操作电子系统。SCXI-1104C采用一种可编程的存储器，在其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，通过数字式或模拟式的输入输出来控制各种类型的机械设备或生产过程。

从结构上分，PLC分为整体式和组合式两种。整体式PLC一般还配备有特殊的功能单元，如模拟量单元、位置控制单元等，使其功能得以扩展。这类PLC特点包括结构紧凑、体积小、价格低，小型PLC一般采用这种整体式结构。组合式PLC包括CPU模块、1/O模块、内存、电源模块、底板或机架，这些模块可以按照一定规则组合配置。

SCXI-1104C  其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令

The working principle of a programmable logic controller (PLC) is based on a program loop, SCXI-1104C, the steps of this loop can include capturing the input signal, performing logical operations, generating the output signal and waiting for a cycle time. In the PLC’s loop program, the input signal is read and transmitted to the CPU, which is then programmed to perform logical operations. These logical operations can include Boolean operations, arithmetic operations, comparison operations, and so on. According to the requirements of the programming, the PLC generates output signals and sends them to the I/O module, which then controls the external execution device.

When the programmable logic controller is put into operation, its working process is generally divided into three stages, namely, input sampling, user program execution and output refresh. Completing these three stages is called a scan cycle. During the entire run, the CPU of the SCXI-1104C programmable logic controller repeats the above three phases at a certain scanning speed.

A programmable logic controller (PLC) is a digital operational electronic system designed specifically for use in industrial environments. The SCXI-1104C uses a programmable memory in which the instructions for performing operations such as logical operations, sequence control, timing, counting and arithmetic operations are stored, and various types of mechanical equipment or production processes are controlled through digital or analog input and output.

In terms of structure, PLC is divided into integral and combined two types. Integral PLC is also generally equipped with special functional units, such as analog units, position control units, etc., so that its functions can be expanded. This type of PLC features include compact structure, small size, low price, small PLC generally adopt this integral structure. The combined PLC includes a CPU module, 1/O module, memory, power module, baseboard or rack, which can be combined and configured according to certain rules.