IS200TREAH2AED工业自动化 控制模块 DCS PLC系统

IS200TREAH2AED工业自动化 控制模块 DCS PLC系统

IS200TREAH2AED工业自动化 控制模块 DCS PLC系统

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。

程序可能包括高级功能，例如数学运算、计时、计数和通过现代网络协议共享信息。对于较旧的中继系统，其中许多操作即使不是不可能，也是极其困难的。

输入/输出卡

传感器、按钮、开关、继电器、螺线管甚至网络设备与连接到 I/O 卡上的螺丝端子的 I/O 信号共享信息。可以根据每台机器和设施的需要选择这些卡。在一些小型 PLC中，I/O 端子不是模块化卡，而是方便地安装在 PLC 的侧面。

由于 I/O 设备结构种类繁多，分立和模拟模块的种类繁多，模拟模型的术语有“源”与“灌”，“电压”与“电流” 。

编程设备和人机界面

PLC 本身之外有两个非常重要的组件：编程设备和人机界面 (HMI)。编程设备可以是来自同一制造商的台式计算机、膝上型计算机或手持式仪器。一些小型 PLC 甚至在前面有按钮，可以在不需要计算机的情况下对非常基本的逻辑操作进行编程。

IS200TREAH2AED工业自动化 控制模块 DCS PLC系统

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.

Programs may include advanced functions such as mathematical operations, timing, counting, and sharing information over modern network protocols. Many of these operations are extremely difficult, if not impossible, for older relay systems.

Input/output card

Sensors, buttons, switches, relays, solenos, and even network devices share information with the I/O signals connected to the screw terminals on the I/O card. These cards can be selected according to the needs of each machine and device. In some small PLCS, the I/O terminals are not modular cards, but are conveniently mounted on the side of the PLC.

Due to the wide variety of I/O device structures and the wide variety of discrete and analog modules, the terms of the simulation model are "source" and "perfusion", "voltage" and "current".

Programming devices and human-machine interfaces

There are two very important components outside the PLC itself: the programming device and the human machine interface (HMI). The programming device can be a desktop computer, laptop, or handheld instrument from the same manufacturer. Some small PLCS even have buttons on the front that allow very basic logic operations to be programmed without the need for a computer.