1. Introduction of PLC-touch screen
Touch industrial graphic display (referred to as touch screen) is a new type of programmable control terminal. It is a new generation of high-tech human-machine interface (referred to as HMI or MMI abroad) products. It is an intelligent operation display that replaces the traditional control panel and keyboard. It can be used for parameter setting, data display, depicting automatic control process in the form of curve, animation, etc., and can simplify the PLC control program. It has the characteristics of small size, simple connection, dustproof, anti-vibration, waterproof, anti-electromagnetic and so on.
PLC is a programmable controller, which has the characteristics of high operation speed, rich instructions, powerful functions, high reliability, easy to use, flexible programming, and strong anti-interference ability. In recent years, with the continuous advancement of science and technology, various industries have become more and more demanding on the degree of automation of their production equipment and systems. Plays a very important role.
2. PLC-touch screen application field
* Automatic control of traditional industrial equipment and machinery;
* Small and medium-sized process control system;
* Remote maintenance service system;
* Energy-saving monitoring and control system;
3. Specific solutions based on PLC control and touch screen
3.1 The solution of urban (factory) sewage treatment automation control system
1 System Overview
The lower control station of the sewage treatment engineering automation system adopts the latest intelligent controller integrating host computer, PLC and field bus functions as the main control device, and is also equipped with relays, contactors, intelligent thermal relays, power transmitters, etc Device to complete the protection and control of process equipment, process data collection and control functions, etc. In addition, the system also includes online water quality analysis instruments, transmitters, regulating valves, solenoid valves, various pumps and fans, etc.
2 Main control functions of the system
* Automatic oil drain control: After the sewage enters the grease trap, the controller automatically opens the steam valve to heat the sewage according to the water temperature, so that the water temperature reaches the set temperature, and the oil slick is started. Absorb the floating oil on the water surface to achieve the purpose of oil discharge;
* Cistern submersible pump control: after the sewage enters the cistern, start and stop the submersible pump according to the water level, and send the sewage to the first-level air floatation pool;
* Control of coagulation and dosing pump: control the start and stop of coagulation and dosing pump according to the start and stop of submersible pumps;
* Alkali addition and PH value control: automatically adjust the alkali addition amount according to the detected PH value, so that the PH value after neutralization is controlled at 6 ~ 9;
* Reflux pump control: control the start and stop of the return pump according to the start and stop of the submersible pump;
* Fan control: According to the determination of oxygen content in the oxidation tank, automatically control the start and stop of the fan;
* One and two sedimentation tanks automatic sludge discharge control;
* Filter backwash control at regular intervals.
3 System characteristics
* Based on Windows NT / 2000 / XP platform, adopting object-oriented technology and methods for system design and software implementation;
* Strong openness, follow ODBC, COM / DCOM, AcTIve X, IEC-1131-3 and other international standards;
* Can integrate WINCC, IFIX, FIX32, RSVIEW, INTOUCH, resistance state king and other resistance state software according to user needs;
* Intuitive system interface with perfect browsing function;
* Complete system function, advanced technology, simple operation and low maintenance;
* Rich and convenient expansion capabilities, which can be easily expanded based on existing systems;
* The system provides rich forms of reports, bit statistics and decision-making basis.
4 System indicators
* Data refresh 1s;
* Event sequence resolution "2ms;
* Control command response time ≤1s;
* Adjust the screen response time "1s.
5 Schematic diagram of system composition
6 Main hardware configuration of the system
The system hardware is composed of programmable controller (including digital input / output module and analog input module), WPLC-C wireless transparent transmission terminal, host computer, frequency converter, sensor and several electrical components.
(1) PLC: S7-400 series from SIEMENS (with digital expansion input / output module and analog input module)
(2) Frequency converter: adopts VLT series of DAFOSS company; according to the data sent by PLC (PH value, aeration oxygen content, tank liquid level, flowmeter and other analog signals, water pump operation, electric valve opening, fault alarm, etc. are digital Signal) value adjusts the operation of the equipment and feeds back its internal operating parameters to the PLC and the host computer.
(3) Host computer: It can be used as an engineering station to program PLC and configuration software, and the operator station can monitor the operation of the system. The host computer uses Yanhong YH-MB945VEA.
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