Corrugated machine production management system (2)

Second, the production and management of the core hardware and equipment This item is actually the biggest factor influencing the selling price of the "Walker machine production management system", and it is also the greatest pain for the user when considering maintenance and upgrading in the future. The common examples are now compared as follows:
a.Industrial computers When the man-machine interface, using PLC as the device input and output control.
â–¡ General European and American equipment use this model.
â–¡ The advantage is high stability, not easy to fail, and strong expansion.
â–¡ Disadvantages are that the material cost is too high, the selling price is high (US$ 150,000 to 250,000), and many of the materials are produced in Europe and the United States and are not easily found in the country.
b. Microprocessor is used as man-machine and device input/output control.
â–¡ The early birth control system, with its current low-priced system, is a common sight.
â–¡ The advantages are low cost and low price.
â–¡ Disadvantages are exclusive circuit templates, not only high failure rate, low scalability, but maintenance is still a single-family business, if this circuit template is discontinued, or the system needs to cooperate with mechanical upgrades, then only the entire package is replaced!
c. Use an industrial personal computer (Personal Computer) as man-machine and device input/output control.
â–¡ At present, most production management suppliers use personal computers as the main framework for control.
â–¡ The advantage is that the cost is reasonable and the compatibility is high. The computer can be upgraded with the market and the material can be easily obtained.
However, it should be noted that since the industrial-grade personal computers have the same functions as the general desktop computers, the main difference is to strengthen the use of high-temperature, high-voltage, vibration and long-term use in harsh environments. Unlike the clean and air-conditioned work environment of the office, it takes 8 to 10 hours a day to use high dust and steam on the spot, and operates 24 hours a year. Generally, desktop computers are not suitable for this environment. However, relative to the price of industrial-grade computers, it is common for some suppliers to replace them with cheaper desktop computers. The result is that they often change and often become bad.
However, it should be noted that since the industrial-grade personal computers have the same functions as the general desktop computers, the main difference is to strengthen the use of high-temperature, high-voltage, vibration and long-term use in harsh environments. Unlike the clean and air-conditioned work environment of the office, it takes 8 to 10 hours a day to use high dust and steam on the spot, and operates 24 hours a year. Generally, desktop computers are not suitable for this environment. However, relative to the price of industrial-grade computers, it is common for some suppliers to replace them with cheaper desktop computers. The result is that they often change and often become bad.
Third, the structure of production management control is differentiated by control architecture and can be divided into:
a. Central Computer Architecture â–¡ Early production management Because of the high cost of computers, most of them use this kind of architecture. Its characteristic is that all the data is gathered, and the control is centralized in one computer.
â–¡ The advantage is to save hardware costs and it is easier to develop software.
â–¡ Disadvantages are that after the specifications are set, subsequent mechanical upgrades will have poor scalability. A single point of failure will cause the system to stop, and all workstations will see a single screen, which is more monotonous.
b. Decentralized control â–¡ Decentralized control is the main trend of all current control systems. It is a cooperative method of mining and division of labor. Each machine has a separate computer controller. All computers communicate information through network communication to achieve division of labor control. purpose.
â–¡ The advantage is that each computer controller can be independently updated at any time according to the mechanical upgrade. It has strong expandability. When a single point of failure does not lead to the normal operation of other workstations, each workstation can plan the screen according to its characteristics and needs.
â–¡ The disadvantage is that with the number of machines, the cost of computer hardware must be increased.
It should be noted that whether the network communication system used by the production management system supplier is a self-developed system, or the current market network system (such as NOVELL network server, WINDOWS NT network server); If the former is the case, pay attention to whether the network card is a standard one and whether there is a compatible substitute product in the market (if it is self-developed, it is difficult to obtain maintenance); the latter, the validity of the use of the web server software must be considered. The problem is that if a set of legal web server software is sold for 50,000 yuan, if it is fined 500 times, that is, 25 million yuan, is it worth it?
Fourth, the connection between production management control and motor control is differentiated from the connection of motor control, and can be further divided into:
a. Master control: The control of all motors is controlled by the point, almost all foreign equipment.
â–¡ The advantage is that the control power is centralized in the central control computer, all actions are completed under the supervision of the computer.
â–¡ The downside is that if the computer fails, the entire line will immediately stop and cannot be controlled electrically or manually.
b. Serve (Slave) control: computer-aided motor control, switch between the two to select the computer automatic mode or manual operation of electronic control mode, domestic equipment are of this type.
â–¡ The advantage is that in the event of a computer failure, electrical control can be switched back and manual production can be continued.
â–¡ The disadvantage is that in addition to the computer, there will be people involved in the operation. The system is more complex in design and is equivalent to an auxiliary backup system. (To be continued)