The AI ​​series instruments produced by Xiamen Yudian Company have good communication functions and can form a field bus based on the AIBUS communication protocol. The AIDCS application software provided by the factory can run under Chinese WINDOWS 98/ME/XP and other operating systems, and can realize centralized monitoring and management of 1~200 AI series instruments.
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Shandong Jinruixiang Geoetextilel Material Co.,Ltd. is a high-tech enterprise which integrates development, design, production, consultation, construction, domestic and international trade of new earthwork synthetic material. The company was established since 2000 and located in No. 10 Yuanshan Road, High-Tech Development Zone, Laiwu district, Jinan City, Shandong Province, China.
The company has specialized in producing geotechnical material including HDPE geomembrane, LDPE geomembrane, LLDPE geomembrane, EVA waterproof board, Composite Geomembrane, polypropylene geotextile, polyester geotextile, woven geotextile more than 15 years. The products are widely used in the field such as the landfill, pond, mine, garden landscape, water conservancy, highway, railway, oil field, biogas, industry and aquaculture etc.
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A : Our facoty is located is No.10 Yuanshan Road High-tech Development Zone, Laiwu District, Jinan City China. You can take the plan to Jinan Yaoqiang International Airport, then we can pick you up.
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PLC industrial design AIBUS field communication bus is taken from: "MM Modern Manufacturing" 2006 Ninth Author: Zhang Lei Abstract: In the case of large-scale applications to monitor, transmission, instrumentation and communication consisting of the host computer-based distribution The Control System (DCS) is undoubtedly a better control solution.
Introduction: The AI ​​series instruments produced by Xiamen Yudian Company have good communication functions and can form a field bus based on the AIBUS communication protocol. The AIDCS application software provided by the factory can run under Chinese WINDOWS 98/ME/XP and other operating systems, and can realize centralized monitoring and management of 1~200 AI series instruments. In the case of large-scale application, the distributed control system (DCS) consisting of monitoring, transmission, communication instrument and host computer is undoubtedly a better control scheme. This paper attempts to discuss AI instrument and common from the aspect of programming. The combination of industrial PLC control systems, the application of this combination of multiple communication protocols is quite extensive and representative.
Flexible and variable control scheme Industrial PLC selects LG's MK-120S series DR-30U, which belongs to small and medium-sized PLC. The CPU processing speed is 0.1US/step, and the user program capacity is 7k steps. It has two communication interfaces RS232 and RS485. For general occasions, RS232 can be connected to a human-machine interface for centralized monitoring of smart meters. RS485 can be connected to multiple AI-518 smart meters remotely. For complex applications, RS232 can be connected to the standard serial interface RS232 of EIA/TIA. => 485 converter connects multiple AI-518 smart meters, RS485 is used to connect the human-machine interface and multiple inverters compatible with the same RS485 protocol. This flexible and controllable control solution has the advantage of good cost performance, and can obtain the best control characteristics with minimum hardware investment. Of course, this is inseparable from the advantages of the artificial intelligence adjustment and reliable communication transmission of the U-meter.
The program design detailed program design takes 14 AI-518 smart meters as an example, corresponding to the first smart meter, the address parameter in AIBUS is 1, and the variable value defined in the man-machine interface and PLC is: measured value DATA1, given The fixed value DATA2, the alarm variable PARA1, corresponds to the second smart table, its address in AIBUS is 2, and its variable value is: measured value DATA3, given value DATA4, alarm variable PARA2..., and so on, Both DATA1-28 and PARA1-14 are data registers of the PLC. Because Yudian's AIBUS communication protocol is easy to use and RS485-based hardware communication compatibility is good, this paper will define the method of communication and display parameter variables in the PLC program. It is easy to apply it to On other manufacturers' PLCs.
1. The design flow of the program is described as follows ("//" is a block comment):
(1) The address cycle variable P of the PLC power-on initialization smart meter is 1; //P is the data register of the PLC.
(2) 14 sets of smart meters "set DATAX" for write condition polling; / / X is even, and 0 (3) for the above 14 write conditions "or" for M-write; / / M -write is the auxiliary relay of the PLC.
(4) Call the smart table read/write subroutine.
(5) When the address loop variable changes from 1-14, DATA1-28 and PARA1-14 are assigned to DDISP, DSET and DALARM respectively. // These three parameters are data registers, which are read/write of 14 tables/ Alarm public address pointer.
(6) Send a read/write frame with a clock of 100 MS as the period, and distinguish the received byte by "read/write" byte for indirect address transmission. The format is similar to: MOV DREV #DDISP, MOV DREV+1 #DSET, where “DREV†is the first word of the received frame defined by the PLC serial communication command (a total of 10 bytes conforming to the AIBUS standard); “DREV+1†is the second word of the received frame; The received third word "DREV+2" contains the alarm information of the smart table, and the word/bit is converted to "and/or" and then indirect address transmission.
(7) address loop variable +1;
(8) Reset to 1 when the address variable is increased to 14;
(9) The program end statement;
(10) Smart table read/write subroutine.
2, the "set DATAX" write condition of the smart table programming method specifies that the old given value of the No. 1 table is stored in "DOLD1", when the "No. DATA1" is written on the HMI table. During operation, since the new "reference value DATA1" changed is different from the old value "DOLD1", this value is assigned to the table No. 1 to write the flag M1 (M1 is the auxiliary relay of the PLC), and then the "reference value DATA1" is transmitted. Go to the old given value "DOLD1", and assign the address write pointer P of the No. 1 table to 1, and transfer the "given value DATA1" to the public write value "DWRITE" of 14 tables; the corresponding address Smart meters with different parameters should be deduced by analogy.
3. Programming method of smart table alarm information Since the high byte of the third word of the received frame is the alarm information, the high and low bytes of the third word should be inverted to obtain the 8-bit byte "HEX-ALARM" of the alarm. According to the AIBUS standard, the 0-5 position 1 state of the 8-bit byte represents the upper limit, lower limit, positive deviation, negative deviation and overrange alarm respectively, and the "HEX-ALARM" and "HEX1F" are phase-wisely matched, and the result is assigned. Give "DD-ALARM". In the normal state of the smart meter, the value of "DD-ALARM" is 0; in the alarm state, its value must not be zero. Assign the status of "DD-ALARM" to zero to "DALARM" to display the alarm status of the corresponding smart meter. According to this idea, by slightly modifying the program, it is possible to display on the human-machine interface whether multiple smart meters have upper limit, lower limit, positive deviation, negative deviation and over-range alarm, so that we can better understand the situation at the control site.
4. Design flow of intelligent table read/write subroutine Since only the measured value/write set value is to be read, according to the requirements of the AIBUS communication protocol, the PLC can add the parameter code 00H (given value) of the meter. Therefore, the design process of the smart table read/write subroutine is as follows:
1, address loop variable P + 80 -> P1; / / P1 is the data register of the PLC
2, P1 * H100-> P2; / / P2 is the data register of the PLC
3, P1 + P2 -> PP; / / PP is the protocol address of the smart table in AIBUS, defined in the first word in the transmission frame
4. When the M-write condition is met:
(1) transmitting HEX43 to the second word of the transmission frame; //HEX43 is the write smart table flag (2) transmitting "DWRITE" to the third word of the transmission frame;
(3) "DWRITE" + HEX43 + address loop variable P, the result is transmitted to the 4th word of the transmission frame; / / write byte check
5. When the M-write condition is not met:
(1) transmitting HEX52 to the second word of the transmission frame; //HEX52 is the read smart table flag (2) transmitting HEX00 to the third word of the transmission frame;
(3) HEX43+ address loop variable P, the result is transmitted to the 4th word of the transmission frame; / / read byte check
Experience summary and program effect
In the process of debugging the program, the serial port monitoring tool of the PLC should be used to monitor the communication status with the smart meter. If necessary, the transmission clock period of the read/write frame is extended, and the number of bytes of each read/write frame is observed. Whether the write byte, alarm and check byte meet the requirements of the AIBUS protocol.
When the given value of a smart meter is modified on the human-machine interface, the refresh rate of the smart table is fast, and there is a certain time delay on the man-machine interface displayed in the centralized display. Analysis: "Write given value" operation can return 10 bytes within 100ms, but the given value (hexadecimal format) represented by the second word is actually the last assignment, which needs to be added to this smart table. The reference value written to the PLC is returned only when a read operation is performed. Since the program is designed according to the principle of “writing a given valueâ€, when the write set value operation of the smart table is finished, the smart table continues to read at the 100 ms interval according to the protocol address of the “write given value†operation. "Measured value" operation, the polling is still in the order of AIBUS protocol address 1 -> 14, then the delay time of refresh display = "100ms + PLC program cycle time" after the "write set value" operation on the man-machine interface × 14+ (smart meter-) PLC-) man-machine interface signal transmission time), the measured delay time is not more than 3 seconds. In order to improve the display delay, a line of the program can be inserted in the second paragraph of the above paragraph, and the new "set value DATA1" is directly transmitted to the display unit of the corresponding smart table to display the value "DATAX" (X is an even number, and 0
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Item
TGSG15-15
TGSG20-20
TGSG25-25
TGSG30-30
TGSG35-35
TGSG40-40
TGSG45-45
Longgitudinal Tensile strength ≥ (KN/m)
15
20
25
30
35
40
45
Transverse Tensile strength ≥ (KN/m)
15
20
25
30
35
40
45
Longitudunal Elongation ≤ (%)
15
Transverse Elongation ≤ (%)
13
Longitudinal Tensile strength at 2% strain ≥ (KN/m)
5
7
9
10.5
30
30
30
Transverse Tensile strength at 2% strain ≥ (KN/m)
5
7
9
10.5
30
30
30
Longitudinal Tensile strength at 5% strain ≥ (KN/m)
7
14
17
21
24
28
32
Transverse Tensile strength at 5% strain ≥ (KN/m)
7
14
17
21
24
28
32
Width ≤ (m)
6
Plastic Geogrid,Pp Biaxial Geogrid,Plastic Geogrid Biaxial,Pavement Reinforcement Geogrid
Shandong Jinruixiang Geotextile Material Co., Ltd , https://www.jrxgeosynthetics.com