What are the series and characteristics of Siemens PLC

Siemens PLC is divided into three types according to small, medium and large, followed by: s7-200, s7-300, S7-400 series. The selection principle of Siemens PLC is the same as that of general PLC.
Features of Siemens PLC:

1. Reliable.

A PLC does not require a large number of moving parts and wiring electronics. Its connections are greatly reduced. At the same time, the maintenance of the system is simple and the maintenance time is short. Plc adopts a series of reliability design methods to design.

For example: redundant design. Power failure protection, fault diagnosis and information protection and recovery. PLC is a control device specially designed for industrial production process control. It has a simpler programming language and more reliable hardware than general-purpose computer control. A simplified programming language is adopted. The programming error rate is greatly reduced.

2. Easy to operate.

PLC has high ease of operation. It has the characteristics of simple programming, convenient operation, easy maintenance, etc., and it is generally not prone to operating errors. The operation of PLC includes the operation of program input and program change. The input of the program can be directly displayed, and the operation of changing the program can also be directly searched or program searched according to the required address number or contact number, and then changed.

There are many programming languages available for PLC. It is closer to the ladder diagram and the electrical schematic diagram. Easy to grasp and understand. The self-diagnosis function of PLC lowers the requirements for maintenance personnel's maintenance skills. When the system breaks down, through the self-diagnosis of hardware and software, maintenance personnel can quickly find the fault location.

3. Flexible.

The programming language adopted by PLC includes ladder diagram, Boolean mnemonic, function chart, function module and statement description programming language. The diversity of programming methods makes programming simple and the application area expanded. The operation is very flexible and convenient, and it is very easy to monitor and control variables.