PM3328B-6-1-3-E 80026-524-01 控制模块 DCS PLC系统

PM3328B-6-1-3-E 80026-524-01 控制模块 DCS PLC系统

PM3328B-6-1-3-E 80026-524-01 控制模块 DCS PLC系统

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。

虽然编程设备允许用户查看和修改运行在 PLC 上的代码，但 HMI 提供了一种显示信息和获取输入的方法，将控制系统建模为一个整体。HMI 通常不提供任何修改逻辑程序的方法。

PM3328B-6-1-3-E 80026-524-01 控制模块 DCS PLC系统

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.

While programming devices allow users to view and modify the code running on the PLC, the HMI provides a way to display information and get input, modeling the control system as a whole. The HMI usually does not provide any way to modify the logic program.