SIMATIC S7-200 PLC S7-200 PLC is an ultra-miniaturized PLC, which is suitable for automatic detection, monitoring and control in all walks of life and various occasions. The powerful functions of S7-200 PLC enable it to realize complex control functions whether it is running on a single machine or connected to a network. S7-200PLC can provide 4 different basic models and 8 kinds of CPU to choose from.

SIMATIC S7-400 PLC The S7-400 PLC is a programmable controller for the mid- to high-end performance range. The S7-400 PLC adopts a modular fanless design, which is reliable and durable. At the same time, it can choose CPUs of various levels (functions are gradually upgraded), and is equipped with a variety of templates for general functions, which enables users to combine different special-purpose modules according to their needs. system. When the scale of the control system is expanded or upgraded, as long as some templates are appropriately added, the system can be upgraded and fully meet the needs.

When communicating in the PLC network of Mitsubishi, you will not feel the difference and discontinuity of the network type, and you can perform data communication across the network and remote monitoring, modification, and debugging of programs without considering the level and type of the network. . MELSECNET/H and CC-Link use cyclic communication to send and receive information periodically and automatically. No special data communication program is required, and only simple parameter setting is required. MELSECNET/H and CC-Link use the broadcast method to transmit and receive cyclic communication, so that data sharing on the network can be achieved. For the Ethernet, MELSECNET/H, and CC-Link networks used by the Q series PLC, network parameters and various functions can be set easily on the GX Developer software screen.

In addition, in addition to the networks mentioned above, Q series PLCs can also support networks from other manufacturers such as Profibus, Modbus, Devicenet, and ASi, and can also carry out serial communications such as RS-232/RS-422/RS-485. , through data line, telephone line for data transmission and other communication methods.

This is mainly reflected in the capacity and operation speed. The program capacity of Siemens CPU226 is 20K, and the data capacity is 14K; while the Mitsubishi FX2N is only 8K in total, and the later 3U has been improved.

Siemens CPU226 and CPU224XP are standard equipped with two 485 ports, namely PPI ports, with a maximum communication speed of 187.5K; while all series before Mitsubishi FX3U have a 422 port, and the speed is 9.6K. If you need to connect a smart meter or something, you must purchase special modules such as FX2N0-485BD. Moreover, the two communication ports can be connected to the download data cable and the touch screen to debug the program. Otherwise, you have to unplug the touch screen data cable and then connect the touch screen data cable. It is very troublesome to adjust the program back and forth.

The above is the difference between Siemens PLC and Mitsubishi PLC on the internal chip, I hope it can help everyone.