Control cabinet manufacturers control cabinet's main role, is through the console button switch, on a variety of industry equipment, to realize the proximity remote control, mainly to control the motor other mechanical movements.

There are a variety of control cabinets, such as: frequency control cabinets, PLC control cabinets, soft start control cabinets, fire control cabinets, autocoupler step-down control cabinets, sewage control cabinets, explosion-proof control cabinets submersible mixer control cabinets so on.

In the programmable logic controller system design, the first should determine the control program, the next step is the programmable logic controller engineering design selection. Process characteristics application requirements are the main basis for design selection. Programmable logic controllers related equipment should be integrated, standard, in accordance with the principle of easy to form a whole with the industrial control system, easy to expand its functionality selection of programmable logic controllers should be selected in the relevant industrial areas have been put into operation performance, mature reliable systems, programmable logic controllers, system hardware, software configuration functionality should be compatible with the device size control requirements. Familiar with programmable controllers, function charts related programming language is conducive to shorten the programming time, therefore, the engineering design selection estimation, should be a detailed analysis of the characteristics of the process, control requirements, clear control tasks scope of determination of the required operation action, safety cabinet manufacturers then according to the control requirements, estimating the number of input output points, the required memory capacity, to determine the function of the programmable logic controller, External equipment characteristics, etc., after the selection of programmable logic controllers with high performance-price ratio the design of the corresponding control system. First, the input output (I / O) point estimates I / O point estimates should be considered appropriate margin, usually based on the number of statistical input output points, then add 10% to 20% of the expandable margin, as the input output point estimates. The actual order, but also according to the characteristics of the manufacturer's programmable logic controller products, the number of input output points rounded. Second, the estimation of memory capacity Memory capacity is the programmable logic controller itself can provide the size of the hardware storage unit, program capacity is the size of the storage unit used by the user application project in the memory, so the program capacity is less than the memory capacity. At the design stage, the program capacity is unknown at the design stage because the user application program has yet been compiled, it is known only after the program is debugged. In order to have some estimation of the program capacity at the time of design selection, the estimation of the memory capacity is usually used instead. Memory memory capacity is estimated without a fixed formula, many literature gives a different formula, generally by the number of digital I / O points 10 to 15 times, plus 100 times the number of analog I / O points, the number of memory for the total number of words (16-bit word), in addition to the number of 25% of the consideration of the margin.