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The king of small-scale real-time buses, RTEX bus

Last Updated on 2018-06-27 Hits:4416
Everyone wants to be a hundred-year enterprise, but few people can live for a hundred years. The secret of Panasonic's 100-year-old shop's continued success is that it should be the word "just in time." Therefore, Panasonic is no longer the ordinary home appliance manufacturer in the traditional impression. In the field of industrial automation, Panasonic makes you refreshed.

In the industrial control bus and IIOT technology accumulation, Panasonic is still at the forefront of the industry, relying on continuous technology accumulation and innovation, relying on in-depth knowledge of industry needs, as well as the vision and vision of the future, as early as 13 years. In the past, as a servo motor manufacturer with a very high occupancy and popularity in China, Panasonic foresaw that there will be a wave of networked equipment development in the future. Thus, the RTEX motion control bus was born in 2004. After years of development, RTEX has now emerged from Panasonic's reputation as a mature industrial field bus that integrates IO, stepping, frequency conversion and other subordinate stations.
RTEX Accomplishes Four Magic Bodies for Small Bus Kings
 
Catch the ball, stop the ball, turn around, raise the foot shot, enter the ball! At the China International Industry Fair held in the past two years, you will be convinced by the stunning skills of Neymar at the Panasonic show. Not surprisingly, the A6 servo motor supporting the RTEX bus also has the skills of Neymar: fast and accurate. . Here, the RTEX bus is a high-speed motion control bus that connects Panasonic PLC controllers and AC servo motors in real time. The technical features are as follows:

* Maximum 32-node communication in 0.5ms

* Based on 100Mbps full-duplex Ethernet communication, support for ring topology

* With high-precision interpolation synchronization clock, to ensure that all servos can operate simultaneously with the host device, while achieving CP (Continuous Path) control

* Allow the length of the entire network cable to be up to 200 meters, the maximum cable length between nodes is 60 meters

* Anti-noise performance meets IEC61000-4-4 standard and can adapt to noise of 2.5kV/s

*All control systems use digital network signal connections to achieve low-cost, easy-to-connect, easy-to-expand performance

* Less connection cable

Therefore, the advantages that the RTEX bus brings to users are: simple development, high performance, simple low cost, and high reliability. Then, how does this "four magic weapons" manifest?

"Simple development" is reflected in that the bus can be divided into hard real-time and soft real-time according to the implementation characteristics. For example, EtherCAT belongs to the soft real-time bus, and the RTEX bus belongs to the hard real-time bus. The hard real-time bus guarantees the real-time and stability of the communication through the chip, and shares the CPU's ability to process synchronous clocks. Therefore, compared with soft real-time, hard real-time can save a lot of software development time.

"High performance" is reflected in the fact that based on the 100 Mbps RTEX network communication protocol, each node including the host controller has an outlet and an entrance. From the exit of the control host, the host and the node are connected in series, and the exit of the last node is returned to the entrance of the control host, which constitutes a ring topology with high transmission efficiency used by the RTEX bus. Since the ring topology uses simple one-way traffic and uses only one pair of signal lines in one cable, it has the advantage of no crosstalk in high-speed communications. In the past, bidirectional transmission of data has a large number of nodes, so the transmission efficiency is low. Now, one-way traffic has a simple path, so it has high transmission efficiency.
"Simple and low cost" is reflected in the fact that the hard real-time bus does not require the CPU to perform additional clock synchronization operations, and thus the CPU's burden is reduced. Compared with soft real-time, realizing the same short-cycle control, hard real-time can save the cost of the CPU. On the contrary, in contrast to our traditional "software-free" thinking, software development requires high development costs and a high threshold for development. Therefore, usually many developers will eventually choose to purchase a mature soft real-time core to complete the development, and the estimation will not save costs in real time than the hardware.

“High reliability” is reflected in the fact that in the process of establishing a pulsed system, as the number of servo motors increases, the wiring between devices becomes cumbersome and complex. After the device is upgraded to the network mode, only the CAT5e is required to connect between the controller and the servo driver. This not only reduces the wiring cost, but also avoids the frequency bottleneck of the pulse command, and effectively improves the system's anti-interference performance. High-level performance in the industry.
Rapid strain high-performance flexible production tool

With the emphasis on flexible production today, the assembly line of small equipment has the advantage of rapid strain. This is where the value of the small-scale real-time bus lies. RTEX is the real-time bus that adapts to this small system.

Currently, the RTEX bus supports 32 nodes. Each complete packet includes 32 nodes of output information and feedback information, which is divided into 64 data blocks. In addition, the RTEX bus provides control word registers and status word registers. Each of these data blocks is 16 bytes in size and contains only the necessary position and speed information as well as some command and status words. With the RTEX bus-based master station as the core, the host side will issue control commands to all nodes at one time, and at the same time obtain feedback signals from all nodes, and complete the control of all node outputs.

Of course, if you want to provide a network segment with more than 32 nodes, RTEX can also increase the number of nodes by appending the number of channels. Each channel finally converges on the computer CPU (200M clocked MCU is available), so real-time performance will not be affected. Any effect.

Although the control part of the servo motor is still based on the pulse system, its network trend has become increasingly apparent. In particular, the establishment of an efficient and easy-to-use mechatronics platform through PLC (Programmable Controller) control of servomotors has gradually become the consensus of leading manufacturing companies. The 32-node RTEX bus is not only used in servo motors, but also in slave devices such as linear servo motors, IOs, stepper motors, and inverters.

In the servo motor control, the RTEX bus can perform the control of PP (planned position), CP (continuous position), CV (continuous speed), and CT (continuous torque). For example, the PP control usually refers to the control of the position, which is to send out the coordinates of the target position to control the position. It is often used for point-to-point control and does not need to care about the walking trajectory.

CP control requires continuous acceleration and deceleration and position calculation by the host controller. This not only ensures the final position, but also ensures that the trajectory to the final position reaches the expected value. Therefore, using the RTEX bus, synchronous operation of the servo motor can be ensured, so that gantry control and the like can easily cause jams due to inconsistent running speeds.
RTEX One Stop Solution - Interaction between Panasonic and RTEX

Panasonic uses its technical advantages in control and driving to independently develop a high-speed, networked RTEX bus to meet the high-end needs of customers in China, Japan, Korea, and Asia. Since Panasonic launched its first RTEX bus product in 2004, it has now developed A4N, A5N and A6N servo motor products. It is used in high-speed semiconductor bonders, high-speed SMT machines, parallel manipulators, high-precision machine tools, and entertainment machines. Medical equipment and various automated special machines have formed a wide range of applications.
RTEX is an open bus that supports solutions formed with major controller vendors, and an excellent interpretation of RTEX in a classic case of system integration within Panasonic: FP-XH RTEX series controller and MINAS A6N servo motor The drivers, which are based on the FP-XH (motion control type) and MINAS A6 standard types, respectively, have been upgraded by adding RTEX communication functions to meet the needs of users from the position control to high-performance motion control development.

Among them, the FP-XH-M8N (RTEX series) of Panasonic's compact motion control PLC has more than two sets of 2-axis or 3-axis addition to the 0.04us/step basic command processing, 0.5ms/5K step scanning cycle and other indicators. The integrated linearity/arc/spiral interpolation and abundant motion control functions such as electronic gear/electronic clutch/electronic cam are more integrated.

The response frequency of A6N servo driver reaches 3200Hz, which is 40% higher than that of the previous generation. It also achieves high-precision driving with 23-bit encoder, load variation suppression, and full-closed-loop control. When the two cooperate, the shortest communication cycle can be achieved as low as 0.0625ms, and the system performance can be optimized.

In the face of high-speed, high-precision development trends, pulse instructions with transmission speeds of 4Mpps have become incompetent. In the RTEX bus system created by Panasonic, a high resolution position control command of 4Gpps can be transmitted, which has obvious advantages. In addition, multi-axis pulse servo can not be synchronized control, and RTEX supports up to 8-axis synchronous control, application flexibility is more assured. The combination of RTEX bus and Panasonic servo control products is a more perfect partner.

RTEX Partner Club - Hug the Internet of Things

At present, RTEX bus has obtained the support of many controller manufacturers. The RTEX partner club, an alliance organization with the purpose of promoting RTEX bus technology and its applications, has begun to take shape. Through the establishment of the RTEX Partner Club, Panasonic is committed to jointly promoting the wisdom and the Internet of Things of Chinese manufacturers. In order to meet market changes and customer needs, RTEX bus partners and distributors of Panasonic's organization held RTEX's first partner club event in China at the opening ceremony of Panasonic Jinqiao Laboratories on June 8, 2017, and obtained RTEX cooperation. Partner's praise.


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