The difference between Mitsubishi PLC and Siemens PLC

The programming philosophy is different

Mitsubishi PLC is a Japanese brand, programming is intuitive and easy to understand, and it will be easier to learn, while Siemens PLC is a Germany brand, the instructions are more general, it is more difficult to learn, but there are fewer instructions, and Mitsubishi has more instructions, so the cycle of learning Mitsubishi and learning Siemens is the same.

The difference between Mitsubishi PLC and Siemens PLC

The difference between Mitsubishi PLC and Siemens PLC

Mitsubishi's advantage

Discrete control and motion control, Mitsubishi's instructions are abundant, there are special positioning instructions, control servo and stepping are easy to complete, to complete some messy action control is also Mitsubishi's strength, and Siemens is weaker in this area, there is no special instruction, do servo or step positioning control is not can not be completed, but the program is chaotic, and the control accuracy is not as good as Mitsubishi.

Process control and communication control Siemens is a strong point, Siemens' analog module is cheap and the program is simple, while Mitsubishi's analog module is expensive and the program is messy, Siemens is also easy to communicate, the program is simple, and Mitsubishi has a weak function in this area. Therefore, for different equipment and different control methods, we must reasonably choose PLC, use its benefits, and avoid its shortcomings. For example, if a device is only controlled by some actions, such as a manipulator, Mitsubishi's PLC can be selected, and if a device has a servo or stepper to be positionally controlled, Mitsubishi's PLC can also be selected; Like central air conditioning, sewage treatment, temperature control, etc., there are many analog quantities to be processed, it is more appropriate to choose Siemens' PLC, and there are many instrument data to be collected by communication on the site of a certain equipment, and Siemens' good control is chosen. The difference is very large. The chips are definitely different (reflected in the capacity and computing speed), but the biggest difference is still reflected in the programming software.

Ideas and structures

Personally, I think that the software of Mitsubishi (a Japanese mid-to-high-end brand) PLC is at least 5 years behind Siemens. Putting aside the large and medium-sized ones, let's compare Mitsubishi's relatively advantageous small machine FX series with the Siemens S7-200 series.

PLCs of the Mitsubishi series

Mitsubishi PLC, also known as Mitsubish Power Line Communication, is the main product produced by Mitsubishi Electric in Dalian. Mitsubishi PLC is common in the Chinese market with the following models: FR-FX1N FR-FX1S FR-FX2N FR-FX3U FR-FX2NC FR-A FR-Q FX1S series: Mitsubishi PLC is an integrated small unit PLC. And it has intact functions and communication functions and other scalability. If you consider the space and cost of the installation, it is an ideal choice.

The X1N series is Mitsubishi Electric's powerful and popular PLC. It has the scalability of extended input and output, analog control and communication, link function, etc. It is a Mitsubishi PLC that is widely used in general sequential operation.

FX2N Series: Mitsubishi PLC is the most advanced series in the FX family. With high-speed processing and the ability to expand many special function modules to meet individual needs, it provides the most flexibility and control ability for factory automation applications.

FX3U: It is a new third-generation Mitsubishi PLC recently launched by Mitsubishi Electric Corporation, which may be called a small *** product.

The fundamental function has been greatly improved, and the fundamental unit of the transistor output type has a built-in 3-axis independent positioning function with a height of 100kHz, and a new positioning command has been added, so as to make the positioning control function stronger and more convenient to use.

FX1NC FX2NCFX3UC Mitsubishi PLC: Significant downsizing I/O type wiring interface reduces wiring costs and saves time.

Q Series Mitsubishi PLC: Mitsubishi Machinery Corporation launched a large PLC, CPU types include basic CPU, high utility CPU, process control CPU, motion control CPU, redundant CPU, etc. Able to meet all kinds of messy control needs. With the rapid development of Mitsubishi Electric's work in China, in order to better meet the requirements of domestic users for the high function and low cost of Mitsubishi PLC and Q series products, Mitsubishi Electric Automation has launched an economical QUTESET type Mitsubishi PLC, that is, a 5-slot Q00JCOUSET with a 64-point high-density hybrid unit; The other 8-slot Q00JCPU-S8SET, which comes with 2 16-point switching inputs and 2 16-point switching outputs, is fully compatible with Q00J and fully supports GX-Developer and other software, so it has the best cost performance.

A-Series Mitsubishi PLC: Using Mitsubishi's dedicated sequential control chip (MSP), the speed/command is comparable to that of large Mitsubishi

PLC; A2ASCPU Supports 32 PID circuits. The number of loops of QnASCPU is unlimited and can be changed with the size of the memory. The program capacity is from 8K steps to 124K steps, and the memory capacity of QnASCPU can be expanded to 2M bytes if memory cards are used. There are a variety of special modules to choose from, including network, positioning control, high-speed counting, temperature control and other modules.

PLCs from the Siemens series

SIEMENS AG FWB: SIE, NYSE: SI is one of the world's largest electromechanical companies, founded in 1847 by Werner von Siemens. The advantages of our SIAMTIC modular controllers are their out-of-the-box use, long-term compatibility and availability, their ability to operate in harsh environments, and the ability to expand and upgrade their modules. Our products are very sensation-resistant and are controlled by centralized and distributed I/O. Therefore, Siemens has been able to enter China's market very effectively in recent years, and can firmly take root in China's market. This has a great relationship with the quality and functionality of Siemens products. Among them are the S7-200, S7-300, S7-400.

The S7-200 is suitable for the manufacture of a range of machines or as a stand-alone solution, as part of a micro-automation system, and the STEP 7 Micro/WIN engineering software is used for automation missions with low functional requirements.

It is a low-cost miniature system. The Siemens S7-300 is a fail-safe type with its compact design, mounted on a DIN rail, integrated into the CPU, maintenance-free by insisting on data on micro memory, and isochronous form on PROFIBUS. The Siemens S7-400 has a rack system with a variety of rack types, excellent high-speed processing and communication functions, the ability to change configurations during operation, the isochronous form on PROFIBUS (Figure 1), and the support for PROFIBUS to connect distributed I/O (Figure 2), which is a fail-safe and fault-tolerant type, and hot-swappable. The S7-400's three H CPUs support hardware synchronization, a robust solution that does not cause any loss of information, and can provide excellent support for engineering missions without additional programming costs, enabling easy expansion of the H system for security applications.

Siemens plc now not only fully uses 16-bit, 32-bit high-function microprocessors, high-function chip microprocessors, RISC (reduced instruction set computer) reduced instruction system CPUs and other *** CPUs, but also configures multiple microprocessors in a PLC for multi-channel processing, and produces a lot of intelligent modules containing microprocessors, making the fourth-generation PLC products become a logic control function, process control function, A veritable multi-function manipulator for motion control function, data processing function, and network communication function.

The difference between Mitsubishi PLC and Siemens PLC

Sections viewed

Contact

working hours