At the scene of the PLC hardware module configuration and software debugging

For all kinds of PLC hardware configuration and software debugging, usually experienced engineer should spend some time on your own field work to design a simple, usually should take the following steps: ( 1) System planning first, must have a thorough understanding of system demand function, and to investigate possible control method, at the same time with the user, or design institute to discuss the best operating procedures, according to the inductive conclusion to draw up the system planning, the decisions adopted by the I/O points of PLC controller system architecture, the required type and I/O module. ( 2) I/O module choice and choose appropriate to address set when the I/O module, according to the planning of the I/O point usage scenarios, by PLC CPU system automatically set the I/O address, or by the user to address the I/O module. ( 3) Ladder diagram and system wiring write good in determining the actual I/O address, on the basis of the function of the system requirements, set out to the writing of the ladder diagram program. At the same time, the I/O address are properly set, so the system of wiring can be conducted. ( 4) Ladder diagram procedure of simulation and modification in writing after the completion of the ladder diagram program, the program written to the PLC, and advance in the PC OpenPLC do online connection system, to carry out online simulation. If the program execution function is wrong, it must be to debug, and modify the ladder diagram program. ( 5) System simulation operation commissioning and actual operation in the online program, if the ladder diagram program execution function is correct, and the system wiring is complete, can make the system in actual operation, the project plan is completed. ( 6) Application notes and archive to ensure ease of maintenance in the future, to commissioning and correct for the actual operation of ladder diagram program making comments, and arrange them archive, to shorten the maintenance in the future and refer to the time of application. This is a good habit of professional engineers, regardless of their maintenance in the future, or handed over to the users, this will bring great convenience, and is an embodiment of your professionalism. The above work, the complex system planning may need a few days or even longer, but a simple system planning has good professional habit in a programming engineers, may only need a few hours. To emphasize a problem here, it is very simple, but almost every project, that is the connection to the PLC. This is often inexperienced engineers often ignore a problem. In fact, most of the scene debugging problems and effort are in connection. Experienced engineers should first check the scene of the connection. Usually, if the connection is done by the user or other construction personnel, by looking at its wiring diagram and the appearance of the wiring, can have a general judgment about the quality of the wiring. And to all the wiring for a complete and careful inspection. Site due to incorrect connection of PLC controller were burned happens repeatedly, before the adjustment of the real, be sure to check carefully. Even if the connection is not your work, check the wiring is your obligations and responsibilities, and can save you a lot of time later.
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