CC22103 1010621 工业自动化 控制模块 DCS PLC系统

CC22103 1010621 工业自动化 控制模块 DCS PLC系统

CC22103 1010621 工业自动化 控制模块 DCS PLC系统

今天的大多数 PLC 都是模块化的，允许用户添加各种功能，包括离散和模拟输入和输出、PID 控制、位置控制、电机控制、串行通信和高速网络。与继电器组等较旧的技术相比，PLC 更易于故障排除和维护、更可靠、更具成本效益且用途更广泛。

根据应用和安装环境，电源可接受 120VAC 或 24VDC。如上所述，此电压通过背板为 CPU 和 I/O 模块提供电源，这些模块以“卡”的形式出现。这些卡可以从它们在载体中的插槽中快速添加或移除。  需要注意的是，CPU 的电源并不为传感器和线圈等现场设备供电。

此电源连接必须单独与卡建立。  中央处理器 (CPU)  CPU 是 PLC 的实际“大脑”，使其成为计算机。即使是小型的非模块化 PLC 也包含一个 CPU。输入信号来自 I/O 卡，逻辑程序根据信号做出决策。如果需要，CPU 然后命令输出随着信号和条件的变化而打开和关闭。

CC22103 1010621 工业自动化 控制模块 DCS PLC系统

Most PLCS today are modular, allowing users to add a variety of functions, including discrete and analog inputs and outputs, PID control, position control, motor control, serial communication, and high-speed networking. PLCS are easier to troubleshoot and maintain, more reliable, more cost-effective, and more versatile than older technologies such as relay groups.

Depending on the application and installation environment, the power supply can accept either 120VAC or 24VDC. As mentioned above, this voltage supplies power to the CPU and I/O modules through the backplane, which come in the form of "cards." These cards can be quickly added or removed from their slots in the carrier. It should be noted that the CPU's power supply does not power field devices such as sensors and coils.

This power connection must be established separately from the card. Central Processing Unit (CPU) The CPU is the actual "brain" of the PLC, making it a computer. Even small non-modular PLCS contain a CPU. The input signal comes from the I/O card, and the logic program makes decisions based on the signal. If needed, the CPU then commands the output to turn on and off as signals and conditions change.