The on-site debugging of the plc program refers to the actual commissioning after all the cables are connected after the equipment is installed in the industrial site. It is also the final debugging of the PLC program. The purpose of on-site debugging is that after debugging, it can be handed over to the user for use or trial operation. There are many people involved in on-site commissioning. To organize well, there must be a debugging outline. In accordance with the outline, step by step, step by step. When starting the commissioning, the device can not be operated first, or even not powered. It can be gradually powered up, turned on, and loaded as the commissioning progresses until it is operated according to the rated conditions. The specific process is generally:
1), check the wiring and check the address. To do it point by point, make sure it is correct. Can not check with electricity, that is to check the line, more trouble. It can also be checked with electricity. After adding the signal, see if the operation of the electronic control system meets the design purpose.
2) Check the analog input and output. See if the I/O module is correct and working properly. If necessary, the accuracy of the input and output can also be checked with a standard instrument.
3), inspection and test indicators. If there is an indicator on the control panel, check the indicator display first. On the one hand, the view light is broken, on the other hand, check if the logical relationship is correct. The indicator light is a mirror that reflects the system's operation. Adjusting it first will facilitate further commissioning.
4) Check the manual action and manual control logic. The above debugging is completed, and then manual operation and manual control logic relationship debugging can be performed. To see the output points of each manual control, whether there is a corresponding output and the action corresponding to the output, and then see if each manual control can be achieved. If there is any problem, solve it immediately.
5), semi-automatic work. If the system can work automatically, then whether the semi-automatic work can be achieved first. Step by step when debugging. Until the entire control cycle is completed. If there is a problem with any step or link, it will start to solve the problem of which step or link.
6), work automatically. After the semi-automatic commissioning is completed, the automatic work can be further debugged. Look at several work cycles to make sure the system works continuously and correctly.
7), analog debugging, parameter determination. All of the above debugging are logical control projects. This is the first time you need to adjust the system debugging. After these debuggings are basically completed, you can start debugging analog and pulse quantity control. The main thing is to choose the appropriate control parameters. Generally speaking, this process is relatively long. To be patient, the parameters should be selected in a variety of ways, and then the best one is selected. Some PLCs, its PID parameters can be obtained through self-tuning. But this self-tuning process also takes a considerable amount of time to complete.
8), abnormal condition check, complete all the above debugging, the whole debugging is basically completed. But let's do some abnormal condition checking. Look at the abnormal situation or some illegal operations that are difficult to avoid, whether it will stop the protection or alarm prompt.
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