LS/T 1810-2017Grain and oil storage. Monitoring and control system of stored-grain condition technical requirements for slave computer (English PDF)

4.1 Compilation principles

4.1.1 Composition of the product model

The product model consists of the extension feature code, enterprise logo, communication method, function features, and improved serial number (if any), as shown in Figure 1.

Figure 1 product model composition

4.1.2 Extension Feature Code

It is represented by the Chinese initials LQF of the food condition measuring and controlling extension.

4.1.3 Corporate logo

It consists of two or three Chinese Pinyin uppercase letters, which are determined by the manufacturer itself.

4.1.4 Communication method

It consists of an Arabic number, "1" for wired communication, "2" for wireless communication, and "9" for other communication methods.

4.1.5 Functional characteristics

It consists of an Arabic number and is represented by "0" or "1". "0" means only the detection function, and "1" means the detection and control function.

4.1.6 Upgrade Sequence Number

After the structure or performance of the device is improved, the model needs to be upgraded. The uppercase English letters A, B, and C can be used in the order of improvement.

Said.

4.2 Classification

4.2.1 Classification by communication method

According to different communication methods, it can be divided into wired and wireless. Wired communication methods can be divided into four categories. RS485, power carrier, Ethernet and others. Wireless communication methods can be divided into four categories. WiFi, Zigbee, digital radio and others.

4.2.2 Classification by power supply

According to the power supply, it can be divided into AC power supply and DC power supply.

5.1 General requirements

Compliance with the requirements of this standard, and in accordance with the drawings and technical documents approved by the prescribed procedures.

5.2 Operating environment

Performed in accordance with 6.2.2 of LS/T 1809-2017.

5.3 Power supply

5.3.1 AC power supply

Performed in accordance with the provisions of 6.3.2 of LS/T 1809-2017.

5.3.2 DC power supply

Performed in accordance with 6.3.3 of LS/T 1809-2017.

5.4 Hardware Interface

Choose from the following three ways.

a) When connected directly to the grain sensor, the bus is connected by a 2-wire system;

b) When connected to the grain sensor through an intermediate device that does not have a communication function, the bus is connected by a 5-wire system, of which 2 are power supplies.

Line (positive with red, negative with black), 1 for signal line and 2 for control line;

c) When connected to the grain sensor through an intermediate device with communication function, the bus is connected by a 4-wire system, of which 2 are used as power supplies.

The line (red for the positive pole and black for the negative pole) and two for the signal communication line.

5.5 System signal transmission

5.5.1 The extension to intermediate device communication protocol format is implemented in accordance with LS/T 1812.

5.5.2 The serial port communication characteristic word of extension to intermediate device should adopt. 1200 baud rate, 1 start bit, 8 data bit, even parity, 1 stop bit.

5.6 Basic functions

5.6.1 Detection of extensions

The test extension should have the following features.

--- should have a standard MODBUS protocol or TCP/IP protocol to communicate with the host computer;

--- should have a food data collection function;

--- should have at least 64K data storage function;

--- should have initialization parameter settings and power-off protection;

--- should have power indication and operation indication function;

--- should have a self-diagnosis function;

--- It is advisable to have an online upgrade function to update software programs in a timely manner.

5.6.2 Measurement and Control Extension

In addition to the basic functions of the detection extension, the following functions should be available.

--- Control the function of the actuator through the intermediate device;

--- Real-time clock function, which can expand interfaces such as intelligent ventilation control and air-conditioning control.

5.7 Main technical indicators

5.7.1 Maximum measurement and control capacity

The number of access to grain sensors is not less than 512, and the number of intermediate devices should be no less than 32.

5.7.2 Independent communication control interface

The communication control interface of the measurement and control extension should be designed with an independent RS485 interface, including grain temperature measurement, automation equipment, intermediate equipment and other communication.

interface.

5.7.3 Maximum transmission distance

The maximum transmission distance between the host computer (transport interface) and the extension should be no less than 3km; the transmission from the extension to the sensor or actuator the distance should be no less than 0.2km. The maximum transmission distance between the intermediate equipment and the grain sensor and actuator shall be not less than 0.2km.

5.8 Power fluctuation adaptability

The supply voltage is within the specified voltage fluctuation range, and the basic functions and main technical indicators shall not be lower than the requirements of this standard.

5.9 Reliability

The average time between failures should be no less than 5000h.

5.10 Working stability

The power-on test time is not less than 7d, and its basic functions and main technical indicators shall not be lower than the requirements of this standard.

5.11 Shell protection performance

The degree of protection is not lower than the IP53 level specified in GB 4208.

5.12 Electrical Safety

It shall pass the routine safety test specified in GB 4793.1, and its basic functions and main technical indicators shall not be lower than the requirements of this standard.

5.13 Anti-interference performance

5.13.1 It shall be carried out in accordance with the conditions specified in the electrostatic discharge (contact discharge) immunity test of the severity class 3 in GB/T 17626.2.

Test, the basic functions and main technical indicators of the extension shall not be lower than the requirements of this standard.

5.13.2 The test shall be carried out in accordance with the conditions specified in the radio frequency electromagnetic field immunity test of the severity class 2 in GB/T 17626.3.

The basic functions and main technical indicators of the extension shall not be lower than the requirements of this standard.

5.13.3 The test shall be carried out in accordance with the conditions specified in the electrical fast transient burst immunity test of severity class 3 in GB/T 17626.4.

The basic functions and main technical indicators of the extension shall not be lower than the requirements of this standard.

5.13.4 The test shall be carried out in accordance with the conditions specified in the surge (impact) immunity test of the severity class 4 of GB/T 17626.5.

The basic functions and main technical indicators shall not be lower than the requirements of this standard.

5.13.5 The test shall be carried out in accordance with the conditions specified in GB/T 3482 for the lightning strike test of class 2, the basic functions and mains of the extension.

Technical indicators must not be lower than the requirements of this standard.

5.14 Environmental adaptability

Should pass the high temperature work, low temperature work, high temperature storage, low temperature storage, damp heat, vibration, impact and other tests, the basic functions after the test, mainly Technical indicators and appearance shall not be lower than the requirements of this standard.

5.15 Structure

Structural requirements.

--- Fasteners should have measures to prevent automatic loosening;

---Metal parts should be rust-proof, anti-corrosive and anti-fumigation;

--- Other structural requirements should comply with the relevant national and industry standards.

5.16 Appearance

Appearance requirements.

---The surface should not have obvious dents, scratches, cracks and deformations. The surface coating should be uniform and should not be foamed, cracked and peeled off;

--- Metal parts should not have rust and other mechanical damage;

---Switches, buttons should be flexible and reliable, the parts are not loosened, and the plugged moving parts can be plugged in freely;

---The light of the different functions is clearly defined, indicating that the symbolic characters and signs of the function should be clear and firm;

--- Other appearance requirements should comply with the relevant national and industry standards.

5.17 Transportation

It shall be able to pass the vibration, free fall and roll test specified in 5.10 of GB/T 6587-2012, its basic functions and main technical means the standard shall not be lower than the requirements of this standard.

6.1 Environmental test

6.1.1 Temperature test

According to the provisions of 5.9.1 of GB/T 6587-2012, the temperature adaptability test is carried out using Group III environmental conditions.

6.1.2 Humidity test

According to the provisions of 5.9.2 of GB/T 6587-2012, the humidity adaptability test is carried out using Group III environmental conditions.

6.2 Basic function test

Connect the tested extension to the host computer, grain sensor, actuator and other intermediate devices to test the basic functions of the extension.

Whether the test results meet the requirements of 5.6.

6.3 Main technical indicators test

Connect according to the actual length or using the simulation line, and test according to the indicators required by 5.7.

6.4 Power fluctuation adaptability test

The power supply voltage of the extension is sequentially adjusted to the rated voltage, the allowable fluctuation voltage upper limit value and the voltage lower limit value and maintained for 15 minutes.

Do not test the basic functions and main technical indicators under each voltage.

6.5 Reliability test

According to the timing censor test program specified in GB/T 5080.7, the failure judgment shall be in accordance with 7.2 of GB/T 5080.1-2012.

Provisions.

6.6 Working stability test

In accordance with the relevant provisions of GB/T 11463, and the system work stability test at the same time, the measurement interval is not more than 24h.

6.7 Shell protection performance test

In accordance with the relevant provisions of GB 4208.

6.8 Electrical safety test

In accordance with the relevant provisions of GB 4793.1.

6.9 Anti-interference test

Electrostatic discharge immunity, RF electromagnetic field radiation immunity, electrical fast transient burst immunity and surge (impact) immunity the relevant provisions of GB/T 17626.2~GB/T 17626.5 shall be carried out, and the lightning test shall be carried out in accordance with the relevant provisions of GB/T 3482.

6.10 High temperature operation, high temperature storage test

In accordance with the relevant provisions of GB/T 2423.2.

6.11 Low temperature operation, low temperature storage test

In accordance with the relevant provisions of GB/T 2423.1.

6.12 Damp heat test

In accordance with the relevant provisions of GB/T 2423.3.

6.13 Vibration test

According to the relevant provisions of GB/T 2423.10.

6.14 Impact test

According to the relevant provisions of GB/T 2423.5.

6.15 Structural inspection

Check with the senses and gauges.

6.16 Visual inspection

Use sensory examination.

6.17 Transportation test

Vibration, free fall and tumbling tests are carried out in accordance with 5.10.2 of GB/T 6587-2012.

7.1 Inspection classification

The inspection is divided into two types. factory inspection and type inspection.

7.2 Factory inspection

The extensions shall be subject to factory inspection and shall be ex-factory after passing the inspection. Factory inspection is generally the responsibility of the manufacturer, if necessary, the user can propose plus. The inspection items are shown in Table 1. The functions and indicators of the factory inspection should meet the requirements of this standard. If there is a project or a project.

If the item fails, the product is a non-conforming product.

Table 1 Factory inspection, type inspection items

Inspection item quality characteristics category test requirements test method factory inspection type inspection Environmental test B Execute according to 5.2 Perform 6.1 - -Basic function A Press 5.6 to execute 6.2 - -the main technical indicators A are executed according to 5.7. 6.3 - -Power fluctuation adaptability B Press 5.8 to execute according to 6.4 - -Reliability B is performed by 5.9 and executed by 6.5 - -Working stability B is performed according to 5.10 and executed according to 6.6 - -Shell protection performance B is performed according to 5.11 according to 6.7 - -Electrical safety A is performed according to 5.12. 6.8 is performed - -Anti-interference performance B Execute according to 5.13 and execute according to 6.9 - -High temperature operation, high temperature storage B Execute according to 5.10 according to 6.10 - delta Low temperature operation, low temperature storage B Execute according to 5.11 according to 6.11 - delta Wet heat B is performed according to 5.14 according to 6.12 - -Vibration B is performed according to 5.14 and is performed according to 6.13 - -Impact B is performed according to 5.14 and is executed according to 6.14 - -Structure C is executed according to 5.15 and is executed according to 6.15 - -Appearance C Execute according to 5.16 and execute according to 6.16 - -Transportation B is performed according to 5.17 and is executed according to 6.17 - -Note. - indicates the item to be inspected; delta indicates the item selected according to the specific situation.

7.3 Type inspection

7.3.1 Type inspection shall be carried out in one of the following cases.

--- When new products or old products are transferred to the factory;

--- After formal production, if there are major changes in structure, materials and processes, which may affect the performance of the extension;

--- 1 time every 2 years during normal production;

--- When the production is stopped for one year to resume production;

--- When the relevant state agencies propose to carry out type inspection requirements.

7.3.2 The inspection items are shown in Table 1.

7.3.3 Sample extraction shall be carried out in accordance with GB/T 10111.

7.3.4 When the batch size is not more than 50 units, the number of samples to be taken is 1~2 units. For Class A items in Table 1 of this standard, if the item is inspected If there is one unqualified item in the test item, the item is unqualified. If one item A is unqualified, the batch of products is judged to be unqualified;

For Class B items in Table 1 of this standard, if there is one unqualified test item in the project, the item is unqualified, and there is one Class B item.

If the item fails, it shall be doubled and re-inspected. If there is still one item, the product is unqualified. For Class C projects in Table 1 of this standard, There are 3 unqualified items in the C-item inspection sub-project that are unqualified.

7.3.5 When the batch size is greater than 50, the sampling inspection shall be carried out according to the method specified in GB/T 2829-2002. Use a sampling plan to determine Level III, the unqualified quality level (RQL) is no more than 40. Usually the RQL specified for Class A projects is less than that for Class B projects.

RQL, the RQL specified for Class C projects is greater than the RQL specified for Class B projects. For Class A projects, there is one unqualified judgment for the batch.

The product is unqualified; the array of B and C items should be judged by the test cost and the existing capacity of the test equipment.

Sampling plan.

7.3.6 Check the requirements of the inspection items, accumulate the number of unqualified or unqualified items, and judge the batch of products according to the judgment array or not qualified. If it is unqualified, it should be treated according to the provisions of 5.12 of GB/T 2829-2002.

8.1 Mark

8.1.1 Product logo

Place a nameplate on the obvious outline of the casing. The nameplate should be clear and at least include the following.

a) product model and name;

b) necessary technical parameters (voltage, current, maximum measurement and control capacity, etc.);

c) product number and date of manufacture;

d) Manufacturer's name and address.

8.1.2 Packaging mark

According to the relevant provisions of GB/T 191.

8.2 Packaging

Performed in accordance with Section 10.2 of LS/T 1809-2017.

8.3 Transportation

According to the relevant provisions of GB/T 4798.2.

8.4 Storage

According to the relevant provisions of GB/T 4798.1 environmental condition level 1K3.

references

[1] GB/T 26882.2-2011 Grain and oil storage test and control system Part 2. Extension