PLC field hardware configuration and software debugging steps - Database & Sql Blog Articles

WIFI test head can be customized for other specifications

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System planning

First, you must have an in-depth understanding of the functions required by the system, and investigate possible control methods. At the same time, discuss the best operating procedures with the user or the design institute, draw up the system plan based on the conclusions drawn, and determine the plc system architecture. , the required number of I / O points and I / O module type.

I/O module selection and address setting

When the I/O module is selected, the CPU system of the PLC automatically sets the I/O address according to the planned I/O point usage, or the user can customize the address of the I/O module.

Ladder program writing and system wiring

After determining the actual I/O address, start writing the ladder program according to the functions required by the system. At the same time, the address of the I/O has been set properly, so the wiring of the system can also be carried out.

Simulation and modification of ladder program

After the ladder program is written, the program is written to the PLC, and the PC can be connected to the OpenPLC system online to perform the online simulation. If the program execution function is incorrect, you must debug and modify the ladder program.

System test and actual operation

Under the online program simulation operation, if the ladder program execution function is correct and the system wiring is completed, the system can be put into actual operation and the project plan is completed.

Program comments and archives

In order to ensure the convenience of future maintenance, it is necessary to endorse the ladder program that can be used for the actual operation of the test, and organize and archive it in order to shorten the time for future maintenance and inspection procedures. This is a good habit of professional engineers. Whether it is to maintain yourself or hand over to users in the future, this will bring great convenience and is a reflection of your professional standards.

Here to emphasize a problem, it is very simple but almost every project will happen, that is, the wiring of the PLC. This is often a problem that is often overlooked by inexperienced engineers. In fact, most of the problems and workloads of on-site commissioning are in terms of wiring. An experienced engineer should first check the wiring at the site. Usually, if the field wiring is done by the user or other construction personnel, the quality of the wiring can be roughly judged by looking at the wiring diagram and the appearance of the wiring. Then perform a complete and careful inspection of all wiring. The situation where the PLC is burnt out due to wiring errors has occurred repeatedly, and must be carefully checked before the actual commissioning. Even if the wiring is not your job, checking the wiring is your responsibility and responsibility, and you can save a lot of time behind you.