Hollysys' PLC products have a much longer history than Inovance. To be precise, Inovance PLC was developed in the past few years, but Hollysys' PLC has a history of more than 15 years and has been widely used in rail transit, rail transit, In the control fields such as thermal power and nuclear energy, it can be said that it has been tested for a long time and has a profound foundation. Hollysys' most outstanding business is DCS, which is well-known in the distributed distribution control industry. Hollysys's business model is mainly based on engineering projects. This type of project basically costs millions and tens of millions. This business model makes Hollysys look down on the money from selling products. This is a common problem in the process control system. .
The model of selling products is that dripping water wears away stone, and accumulated water forms a river. Companies such as Hollysys cannot bear the loneliness of selling products. Therefore, companies like Hollysys have limited influence in small and medium-sized PLC products. It can be said that the small and medium-sized motion control market is not very prominent. . However, Hollysys is well-known in the field of large-scale PLCs. The design method used by large-scale PLCs is basically ARM+FPGA equipped with an operating system. The military industry department likes to use VXworks because Vx has high real-time performance, but the cost is very high. The main control chip of large PLCs is basically The main frequency is 800M or above, and Hollysys’ localized Loongson solution is quite exemplary.
Hollysys large PLC is basically the same as Siemens 300/400. It can be said to be the reappearance of Siemens. PROFIBUSDP and PROFINET are basically standard, but PROFIDRIVE has always been firmly controlled by Siemens. Hollysys' PLC system is similar to the CODESYS route. The operating system runs the host computer to run the core in real time. This practice is common in SCADA.
Inovance Technology's business model is product-oriented, and it can be said that it conquers the market with one knife and one shot. Inovance's product thinking is stronger than Hollysys. After all, tens of billions of sales are the accumulation of PLC servo motors worth several hundred yuan each. Get up. The design model of Inovance PLC started by imitating Mitsubishi, and gradually derived its own style. Do you think H3U and H5U are a good match for Mitsubishi, and AM600 is even better. Closer to home, we still explain PLC R&D and design.
There are several main technical modes for realizing PLC R&D and design technology:
The first type is PLCs such as Mitsubishi Gworks and Siemens smart200.
The lower computer and the upper computer of this kind of small PLC product are independent of each other, that is, the cooperation between the lower computer and the upper computer is the docking instruction. For hardware implementation, STM32 microcontrollers or DSP can be used to achieve it. To make a small computer stable and good, challenging. For a long time, domestic software has been packaged with Siemens or Mitsubishi software. Even now you will find that Mitsubishi's Gworks is compatible with some domestic PLCs.
The second mode is the CODESYS route
The CODESYS class has high requirements for hardware, including the chip's computing power and memory size (using flash or EMMC). After all, it needs to run an operating system. Ubuntu is quite resource-intensive. ROM basically starts at 1GB, RAM starts at 128M, and the chip size The main frequency capability basically starts at 600M. Commonly used chips can be AM33 series, ZYNQ70 series, IMX8 series, T3, etc., and operating systems can be Linux or QNX. In terms of design mode, medium and large PLCs are basically the same.
The performance of PLC using Linux is still limited. Those who pursue the ultimate performance can take the X86 route. The ARM architecture is basically limited to 1.6G. The most popular motion control performance is 64-axis EtherCAT. More can use the X86 architecture to run Windows systems and industrial computer routes. The current soft PLC is the Windows system running codesys class runtime. The X86 architecture chip can easily beat the 6G main frequency, and its performance is not only about motion control, but also artificial intelligence computing. The X86 architecture mostly uses Intel and AMD chips.
