The installation of PLC preparation and installation, debugging, check - inspection

system installation and debugging

reasonable arrangement system installation and debugging process, is to ensure that the key to high quality to complete the installation and debugging tasks. After site inspection and further modify the total program as shown.

1, the technology of preparation of

system technical preparation before installation and debugging work more fully, installation and commissioning will be more smoothly. Technical preparation work include the following contents:

( 1) Familiar with PC random technical data, the original data, deep understanding of the performance, function and various operation requirements, formulate operation procedures.

( 2) Insight into the design data, the system process, especially the process control requirements for each production equipment should have a comprehensive understanding, on this basis, according to the drawing subsystem process flow. Cheng interlocking figure, system function diagram, system operation logic diagram, this will be helpful to the deep understanding of system operation logic, is an important part of the technical preparation.

( 3) Familiar with the performance, design and installation of process equipment, especially the control and power wiring diagram of each equipment, and, as compared with the physical and find errors and correct.

( 5) Study design program, complex part of the input and output points of logic to draw sequence diagrams, some logic errors in the design, can be found when draw the sequence diagram.

( 6) Molecular system debugging scheme, and then on the basis of collective discussion comprehensive become full system debugging plan.

2, PLC controller inspection

the inspection shall be conducted between two parties, shall confirm the equipment and spare parts, spare parts, technical data and accessories of the type, quantity, specification and performance are in good condition for the lab and field validation when debugging. The survey results, the two sides should sign exchange listing.

3, laboratory debugging

( 1) PLC laboratory install and start making metallic stents, each workstation's input, output, module fixed on it, according to the installation of the feed in coaxial cable stations connected to host, programmer, printer and so on, check the wiring is correct, level of power supply voltage selection after conform with PLC, according to the boot program transmission, load the system configuration, system configuration, loaded into the programmer, programming, etc. , according to the operating instructions will open system, can the operations experiment was carried out at this time.

( 2) Type the work program

( 3) Analog I/O input, output, check amend the purpose of this step is to verify the correctness of the input work program, the program's logic process equipment interlocking relationship is expressed by the consistent with design of process control requirements, the program was clear. If is not consistent or can't finish the whole process of operation, that program is wrong, should be modified. In this process, the understanding of the program will gradually deepened, ready for commissioning, at the same time can also be found unreasonable and imperfect part, in order to further optimize.

debug method has two kinds: (1) simulation method: according to the design to do a debug board, to toggle switch analog input nodes, with small relay simulation of the production process equipment relay and contactor, the auxiliary contact simulation runtime return signal node. Its advantage is to have the authenticity of simulation, the switching speed difference is very big can reflect the mechanical contact and PLC controller in the electronic contact mutual connection, the logical false action will happen. The downside is need to increase the commissioning cost and part of debugging work. (2) strong methods: strong functions, using PLC to process involved in the field of mechanical contact, Switch) , with a strong buy method makes its 'tong', 'broken', forced the program is running. Its advantage is debugging workload is small, easy, do not need an additional fee. Defect validation logic is not comprehensive, strong artificial simulation scene node 'tong', 'broken', will cause the program can't continuous operation, only segments.

according to our field debugging experience, the important part of the scene node adopt the mode of simulation, the rest of the way to adopt the strong, take the length of the two complement each other.

logic validation phase to fill out the debugging work emphasizes the daily log, including debugging personnel, time, content of debug, modify records, faults and deal with, with the signature, to establish the accountability system for debugging and commissioning of first-hand information. To modify part of design process, shall be indicated in the drawings, solicit opinions of the designer in time, make every effort to accurately reflect the design requirements.

4, on-site installation and examination of the PLC

laboratory debugging is completed, conditions are ripe, remove the equipment to site installation. When installation should comply with the requirements, the plug-in, and bolts; Communication cable to a unified model, cannot mix, when it is necessary to check with instrument circuit signal attenuation, the attenuation index put forward by the value does not exceed the technical information; Measuring unit, I/O cabinet, connection cable to ground insulation resistance; Dedicated earthing grounding resistance measurement system; Check the power supply, etc. , and make records, after being confirmed that all the requirements, electricity boot.

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