Tag: GPPW CC-Link
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This paper introduces the application and design principle of fieldbus CC-Link technology in the air conditioner production line measurement and control.aspx" title="system" style="text-decoration:underline;color:blue">. It summarizes the use of CC-Link technology. After the system features. [Keywords]: CC-Link; air conditioning production line measurement and control system.
introduction
In Japan, fieldbus CC-Link technology has been widely used in air-conditioning production industries. For example, Mitsubishi Electric, Mitsubishi Heavy Industries, Sanyo Electric, Daikin and other famous air-conditioning manufacturers have already applied CC-Link to production. Therefore, our company aims to introduce mature CC-Link technology into domestic counterparts. With the assistance of Mitsubishi Electric Shanghai FA Center, it is the first to apply CC-Link fieldbus to the centralized control of commercial air-conditioning production line in Haier Huangdao Industrial Park. And the data acquisition system has got a good response. The system is now introduced as follows:
Air conditioning production line process introduction and implementation of measurement and control system
1 Air conditioning production line production process introduction The commercial air conditioning production line has a total of 6 assembly lines (three indoor units, three outdoor units), respectively, for air conditioning production assembly of different power. The process of each line is the same, starting from the third floor.
2 Implementation of measurement and control system
2. 1 system configuration
2.2 System function: (1) Network, the whole monitoring system adopts CC-Link field bus, which can transmit the field data to the main station for management at high speed. (2) The main station and the substation use a Mitsubishi A series PLC to manage the CC-Link network, and send the data to the upper PC for analysis and send the commands issued by the central control room to the field substation (FX). (3) PC unit, PC and main station complete communication and data exchange through RS232 module. In the PC, the quality data (upper and lower limit parameters) and the product bar code correspondence table of all products are stored, as well as the online measurement parameter library of the offline products for retrieval at any time. The PC transmits the operation command to the slave station via the master station PLC to perform the operation, and the slave station transmits the control working state to the PC through the master station PLC. The PC drives the dynamic display through the multimedia card, and displays the information of all the working states (on, off, and alarm) in the workshop for the operator to monitor. The PC receives the alarm and stop line information and immediately prints the fault information and time. Statistical downtime. And use the sound card to drive the speaker for voice prompts. (4) Line body control unit A. One sub-station is set in the front part of the front-loading line and the center-mounted line. Responsible for controlling peripheral controls (motors, cylinders, etc.) and detection components (photoelectric, travel, proximity, etc.). B. One substation is set up in the combination of the commodity inspection line and the rear assembly line. Responsible for controlling peripheral controls and detection sensors. C. The commodity inspection substation is located in the commodity inspection room. As many as 60 air conditioning units in the inspection line are tested, and each air conditioner has the following parameters to be monitored: 1. Safety parameters (withstand voltage, insulation, grounding, leakage) 2. Low-voltage starting parameters (current, voltage) , power, pressure) 3. Heating parameters (including current, voltage, power, pressure, temperature) 4. Cooling parameters (including current, voltage, power, pressure, temperature) 5. Leak detection bar code, therefore, to ensure a large number of systems For data transmission, we consider that the parameter acquisition and control of each air conditioner is done by a CC-Link substation. We use a sliding rail to replace the shielded twisted pair for electrical connection. So that all air conditioners to be tested can run on a fixed track. The above parameter measurement values ​​communicate with the commodity inspection substation via CC-Link.
The system features CC-Link technology, compared with the traditional electronic control system, the system has the following characteristics
1 Easy to configure
1.1 The system hardware connection adopts shielded twisted pair connection, which is convenient for wiring and makes the wiring in the electric control box simpler and clearer, saving wiring and space.
1.2 Communication configuration parameters only need to be set on the master station, and Mitsubishi's CC-Link configuration software can be used for parameter registration without programming, which speeds up the system debugging process.
2 system performance
2.1 After adopting CC-Link technology, the link data is scanned to reach 10Mbps, so that the field data is quickly transmitted to the main station for control.
2.2 CC-Link bus and module excellent anti-interference performance: noise-resistant voltage 1500Vp-p, noise amplitude 1us, noise frequency 25~60Hz has been confirmed in actual use, so far, there is no fault caused by interference
3 Simple maintenance
3.1 In the commodity inspection system, since each air conditioner on the line is independently detected, the drop of each PLC substation cannot affect the operation of other stations.
CC-Link's substation cut-off function and auto-recovery function are very good for this.
3.2 Through the GPPW (Mitsubishi PLC programming software) and configuration software, the information of all stations can be displayed on the screen to help the operator diagnose the fault. Four conclusions As we all know, the domestic household appliance industry is highly competitive, and all manufacturers are committed to improving product quality/yield and reducing equipment and labor costs. This has enabled manufacturers to continuously improve their production technology, and the successful application of CC-Link technology in the air-conditioning industry has been highly valued by users. Especially in comparison with traditional control methods, it has incomparable advantages in system design, installation, commissioning, maintenance and expansion. Therefore, the successful application of CC-Link in the electrical appliance manufacturing industry has a typical significance. Therefore, our company plans to introduce CC-Link technology again in a factory in Guangdong to improve the automation level of household appliance production.
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