Programmable logic controller (PLC) circuit system and control method used in greenhouse high pressure spray control

Abstract

The invention relates to a programmable logic controller (PLC) circuit system and a control method used in greenhouse high pressure spray control, the PLC circuit system comprises a water tank, a water supply pipe, a spray main pipe, spray branch pipes, high pressure sprayers, a PLC control cabinet and a temperature sensor. A high pressure spray pump is arranged between the water supply pipe and the spray main pipe, the spray main pipe is connected with a plurality of spray branch pipes, each spray branch pipe is provided with spray magnetic valves and high pressure sprayers, the PLC control cabinet is connected with the temperature sensor through temperature sensor lines, the PLC control cabinet is connected with the spray magnetic valves through spray magnetic valve control lines, and the PLC control cabinet is connected with the high pressure sprayers through high pressure sprayer control lines. Appropriate procedures are established utilizing strong programming control functions of a PLC according to needs of spray cooling, instability of manual control is reduced, multi-step time control is set flexibly, automatic control functions of the spray cooling are achieved, the temperature sensor is configurated at the same time, and work of the spray cooling can be controlled automatically according to the environment temperature.

Description

technical field [0001] The invention relates to a PLC circuit system and a control method, in particular to a PLC programmable controller applied to the control circuit of a high-pressure spray cooling system, using the powerful programming control function of the PLC programmable controller, according to the spray cooling requirements Compiling a suitable program can not only reduce the instability of manual control, solve the difficulties of manual control, but also flexibly set multi-segment time control to solve the automatic control function of spray cooling. At the same time, it can also be equipped with a temperature sensor to automatically adjust according to the ambient temperature The invention relates to a PLC circuit system and a control method for high-pressure spray control in greenhouses for spray cooling work. Background technique [0002] Greenhouses are commonly known as greenhouses. According to different enclosure materials, there are film coverings, PC b...

AI Technical Summary

Problems solved by technology

[0008] Simple circuit The circuit structure of manual control is simple and the cost is the lowest, but it is inconvenient to use and operate, and a special person is required to operate at the control panel. Not good, so this method is basically eliminated, and few users adopt it

[0009] The time relay control circuit is an improvement to the manual control circuit. This method can solve the inconvenience and uncertainty of manual operation, and has a certain control accuracy. However, the circuit structure is complicated and the fault maintenance is difficult, so this method is rarely used.

[0010] The emergence of single-chip microcomputers has improved the functions of special control modules. Various special modules are used in the automatic control of high-pressure spraying in greenhouses. The basic principle is still time control, and the control accuracy has been greatly improved. However, the special modules have single functions and cannot adapt to field changes. demand, the price is relatively high, and the user psychology is often difficult to accept

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