1. Background and project introduction of Sinopec fueling project:
The Sinopec fueling project is a cross-platform, wide-ranging, wide-ranging nationwide system construction project. Sinopec Co., Ltd. has reformed China Petrochemical's refined oil retail system. Through the construction of the project, the goal of "one card in hand, refueling everywhere" is realized in all petrol stations in the jurisdiction of Sinopec. The Sinopec petrol refueling project will cover 20 provinces (autonomous regions, municipalities directly under the Central Government, and planned cities) affiliated to Sinopec Corp., more than 260 prefecture-level companies, and more than 25,000 gas stations in more than 1,300 county-level companies.
The design of Sinopec's refueling engineering system adopts a four-layer structure, namely the head office level (including Sinopec Management General Center and Sinopec Data Exchange Center), provincial level, prefecture level and various business terminals (including county level management terminals, Gas stations, card issuing outlets, etc.). In the early stage, Sinopec planned the entire plan as:
two. Sinopec's requirements for the hardware of the control machine
The 25,000 gas stations in the entire refueling project will be equipped with an industrial computer as a business terminal. The IPC is responsible for daily IC card refueling quantity and amount statistics, printing of transaction notes, monitoring of refueling machines, daily sales transactions to provincial data centers, and downloading account management information and latest oil prices of IC card users nationwide.
The control station of the gas station plays a very important role. Once a failure occurs, the normal operation of the gas station will be affected. The distribution of more than 25,000 gas stations in Sinopec is relatively scattered. Most of the gas stations are far from the city center. Many gas stations are located in mountainous areas. Maintenance and replacement will be very troublesome when a fault occurs. Therefore, the primary requirement of Sinopec Corp. for the control machine is the reliability of the system. Secondly, the refueling machine is connected to the control and control machine through a serial port. The number of refueling stations in the gas station varies from 2 to more than 30, so the control and control machine is required to have strong functional expansibility. In order to ensure the stable operation of the management and control system, Sinopec chose Linux as the operating system of the control and control machine. Therefore, the control and control machine is required to be fully compatible with Linux in hardware and to run smoothly.
After many comparisons, Sinopec finally decided to control the machine as an industrial machine. IPC has made many special designs to improve the system reliability, its reliability is much better than commercial PC. The following is a system structure diagram of a commercial PC: This structure is called a large motherboard structure, which is very unsuitable for on-site use and maintenance requirements. Active devices such as North-South bridge control chips are integrated on the motherboard. Active devices are easier to damage than passive devices such as capacitors and resistors. Once the motherboard is damaged, it will be very troublesome to replace it: on-site maintenance personnel first need to unplug all the data cables on the motherboard, then need to pull out all the peripheral cards inserted on the motherboard, such as network cards, video cards, etc. Remove the screws one by one to remove the motherboard. Repeat the above process with a new motherboard. It takes 30 minutes to replace a damaged motherboard. Such a long MTBF (mean failure maintenance time) is not allowed for the actual use of gas stations. In addition, commercial PCs do not make special designs for the system's shock resistance, and in the presence of vibration interference around them, it is easy to cause failures such as hard disk damage and card ejection. Once the hard disk is damaged, all one-day transaction data will be lost.
Compared with the commercial PC, the industrial computer has been greatly improved in structure. The following is a schematic diagram of the industrial computer: the main board of the industrial computer is made in the form of a card, which is inserted on the backplane (BackPlane). There are only passive devices such as ISA, PCI bus connectors and capacitors and resistors on the passive backplane, so the probability of damage to the passive backplane is very low, and there is usually no worry of replacement. If the motherboard is damaged, just pull out the motherboard. Therefore, the MTBF time of the system is greatly shortened. In addition, the system's main board and peripheral cards have special fixed pressure bars to prevent the board from jumping out. The hard disk drive has a hard disk shock absorbing frame and shock absorbing rubber pads, which can reduce the damage to the hard disk caused by vibration.
In order to enable the industrial control machine to work reliably in a high dust environment, the air inlet in front of the industrial control machine has a replaceable dust screen. As shown on the left:
The dust-proof net design can effectively prevent dust from entering the chassis.
3. Nematron's hardware solution for Sinopec's management and control machine
Nematron has fully studied the requirements of the field application of the gas station on the reliability of the control machine, and has proposed the following hardware solutions
Motherboard
The industrial motherboard is the core of the control PC. Considering the speed and reliability requirements, Nematron has configured a PIII grade industrial motherboard AES815E-679 for the control machine. Using Intel815E chipset, up to 1.26GHz.
RAID card
In the daily use of the control station of the gas station, a large amount of data will be involved. These data include the price of oil, the amount of fuel, and the data of customers. Once the data is damaged, it will cause serious consequences. However, the hard disk is a wearing part, which is easily damaged due to vibration, shock and other reasons. In order to ensure the security of system data. A RAID card is equipped in the Nematron industrial control computer. The Raid card combines two hard disks of the same specification to form a disk image. In this way, in the case of a hard disk damage, the industrial computer can still operate normally.
Industrial power supply
Unstable mains power supply is an important cause of computer damage. In the suburbs, rural areas and other places, there are situations in the power supply network where the voltage is too high or too low or the surge voltage. This can cause the computer to not start or the power supply to break down. Nematron's power supply for industrial computers is a wide-range industrial power supply, which can work normally even in the environment of external voltage fluctuations.
Electromagnetic Compatibility
Electromagnetic compatibility is also an important link. Nematron IPC has passed FCC, CE certification, and has made technical indicators certification for the IPC finalist Sinopec project.
System scalability
The Nematron industrial control computer is equipped with a bottom plate with 7 PCI slots and 5 ISA slots (can be selected according to different requirements), which can fully meet the expansion requirements of future system functions.
In order to ensure the reliability of the whole machine, Nematron has passed the safety, environmental, electromagnetic, and reliability tests in product testing. The MTBF time has reached more than 50,000 hours. Before the factory, the machine was tested for dynamic baking. Ensure that each factory-controlled industrial computer can operate reliably in harsh environments.
Fourth, the effect of implementation
At present, the Sinopec fueling project has been implemented in various places one after another. Most of the control machines in these provinces use industrial control machines. After a long period of actual operation, the industrial control computer operates stably and reliably on site, and has won praise from users.
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