PU519輸入/輸出卡傳感器、按鈕、開關、繼電器、螺線管甚至網(wǎng)絡設備與連接到 I/O 卡上的螺絲端子的 I/O 信號共享信息?？梢愿鶕?jù)每臺機器和設??施的需要選擇這些卡。在一些小型 PLC中，I/O 端子不是模塊化卡，而是方便地安裝在 PLC 的側(cè)面。由于 I/O 設備結(jié)構(gòu)種類繁多，分立和模擬模塊的種類繁多，模擬模型的術(shù)語有“源”與“灌”，“電壓”與“電流” 。編程設備和人機界面PLC 本身之外有兩個非常重要的組件：PU519編程設備和人機界面 (HMI)。編程設備可以是來自同一制造商的臺式計算機、膝上型計算機或手持式儀器。一些小型 PLC 甚至在前面有按鈕，可以在不需要計算機的情況下對非?；镜倪壿嫴僮鬟M行編程。

PU519

PU519基本組件PLC由幾個基本部分組成。它們可能看起來與各個制造商略有不同，但每個組件的用途和范圍是相同的。PU519其中包括電源、中央處理單元 (CPU)、輸入/輸出卡以及放置輸入/輸出 (I/O) 卡的背板或機架。如圖 2 所示，背板在所有獨立組件之間建立了電氣連接，從而為 PLC 提供了模塊化設計。這種電連接包括電源和通信信號。PU519許多 PLC 制造商在背板上使用專有通信協(xié)議，以便 I/O 可以安全地與 CPU 通信。電源根據(jù)應用和安裝環(huán)境，電源可接受 120VAC 或 24VDC。如上所述，此電壓通過背板為 CPU 和 I/O 模塊提供電源，這些模塊以“卡”的形式出現(xiàn)。這些卡可以從它們在載體中的插槽中快速添加或移除。需要注意的是，CPU 的電源并不為傳感器和線圈等現(xiàn)場設備供電。此電源連接必須單獨與卡建立。

PU519

PU519 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”. There are two very important components outside the PLC itself: the PU519 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.
PU519 Basic components A PLC consists of several basic components. They may look slightly different from individual manufacturers, but the purpose and scope of each component is the same. The PU519 includes a power supply, a central processing unit (CPU), an input/output card, and a backplane or rack for the input/output (I/O) card. As shown in Figure 2, the backplane establishes electrical connections between all the individual components, thus providing a modular design for the PLC. This electrical connection includes a power supply and a communication signal. Many PLC manufacturers use proprietary communication protocols on the backplane so that I/O can securely communicate with the CPU. Power Supply 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.

PU519