The advantages and disadvantages of Mitsubishi PLC and Siemens PLC
Mitsubishi PLC is the main product of Mitsubishi Electric in Dalian. It uses a class of programmable memory for its internal memory program, performing user-oriented instructions such as logic operations, sequential manipulation, timing, counting, and arithmetic operations, and manipulating various types of machinery through digital or analog input/output. Or the production process.
The programmable controllers produced by Siemens (SIEMENS) in Germany are also widely used in China, and are used in metallurgy, chemical, printing and production lines. The PLC products of Siemens (SIEMENS) include LOGO, S7-200, S7-1200, S7-300, S7-400, S7-1500 and so on. Siemens S7 series PLC is small in size, fast in speed, standardized, and has network communication capability, which is more powerful and reliable. S7 series PLC products can be divided into micro PLC (such as S7-200), PLC with small-scale function (such as S7-300) and PLC with medium and high function requirements (such as S7-400).
First of all, their programming philosophy is different. Mitsubishi PLC is a Japanese brand, programming is easy to understand, and it will be easier to learn, and Siemens PLC is a German brand. The instructions are more abstract, the learning is more difficult, but the instructions are less, and Mitsubishi has more instructions, so the cycle of learning Mitsubishi and learning Siemens is the same.
Mitsubishi's strength lies in discrete control and motion control. Mitsubishi's instructions are rich, with dedicated positioning commands, servo control and stepping completion. It is also Mitsubishi's strength to complete some complex motion control. Siemens is weak in this block, there is no dedicated instruction, servo or step positioning control can not be completed, but the program is complex, the control accuracy is not high.
Process control and communication control Siemens is a strong point, Siemens analog modules are cheap, the program is simple, and Mitsubishi's analog modules are expensive, the program is complicated, Siemens communication is simple, the program is simple, Mitsubishi in This feature is weak.
So for different control methods of different devices, we should use PLC reasonably, use its strengths, and avoid shortcomings.
For example, a device can only be controlled by motion, such as a robot, and can choose Mitsubishi PLC. A device has servo or stepping to perform positioning control, and also selects Mitsubishi PLC; like central air conditioning, sewage treatment, temperature Control, etc. There are many analogs to be processed. It is more appropriate to choose Siemens PLC. There are many instruments on the site where the data of the instrument should be collected by communication, and Siemens is well controlled.