Hardware and software configuration methods of DCS system

How to configure a DCS including hardware system and software program

DCS configuration is a system project. Let me talk about my personal understanding, which may not be comprehensive.

Before configuring, the corresponding hardware device must be determined first. The selection of hardware is based on the needs of process conditions. For example, if the process needs to monitor multiple temperature points, then a corresponding number of temperature input cards need to be selected. In the same way, the number of AI (analog input), AO (analog output), DI (digital input), DO (digital output), PI (process interface), as well as the corresponding network configuration, operating station and engineering station are all required Make sure. This ensures that the hardware equipment selected during the configuration process matches the needs of the process conditions.

Of course, the selection must be based on certain principles, such as safety needs, redundancy needs, spare parts needs, application needs, etc.

Before configuring, the entire configuration process should be designed as a whole to reduce repetitive work during the configuration process.

The first step in configuration is to configure the entire network. For example, define the entire network, the addresses and functions of each device on the network, etc.

The second step is to configure the application software. You can formulate rules, such as numbering rules, graphic symbols, colors and animations, etc. In addition, functions such as alarms, grouping and history recording can also be configured.

The third step is to configure the process point. This includes configuring each input and output I/O, including operations such as single-loop control (such as regulating loop, totalizer) and complex control loops (such as cascade, split range).

The fourth step is to configure complex control systems such as logic operations, interlocking, and program control.

The fifth step is to configure the user interface. Such as flow chart, control group, alarm group, overview, history group, etc. ,,

That’s basically it. Of course, some work can be done simultaneously or cross-implemented. There may also be other items and processes that may differ depending on the actual equipment conditions. But the basic idea is this.

The fourth step is

What is configuration software? Is it GX Developer?

Configuration refers to the association between software and actual hardware in industry, called configuration, and GX Developer is configuration software.

Configuration software is interface development software used to quickly establish industrial human-machine interfaces. It can display the data of industrial equipment instruments and control industrial equipment. . It is not really a programming software, and many of them need to be run on the configuration software platform itself. .

Its main feature is to simplify the programming process based on industrial characteristics. Most industrial technicians do not understand programming. The configuration software simplifies and visualizes it. For example, you can drag a control representing an electric meter and then input and match it. The associated actual meter name or address can display the meter's power. Technicians don't understand and don't need to understand how to program it. In most cases, the group can complete most of the work by just dragging controls according to the process and setting variable associations. Part of the logic content can be implemented by using the simple script provided. Although the script requires certain programming logic, it is completely different from programming by programmers. If you have played Warcraft 3, this kind of script belongs to the same type as the map editor of Warcraft 3. It requires programming logic, is very simple to use, does not require programming knowledge, and can be easily learned.

However, the configuration software has the advantage that you don’t need to know how to program to write interfaces. The disadvantage is that it is not a programming software and has limited freedom. Especially the pages presented are often ugly and not beautiful enough. Some industrial products require real programmers. Write an APP instead. .

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