Selection of Siemens PLC Models _ Siemens PLC Model

Description

 

Model selection of Siemens PLC

Firstly, according to the process requirements:

Determine the number of input and output points, namely DI, DO, AI, AO

Determine the need for external communication interfaces such as MPI, DP, Ethernet, etc

Determine which series to choose, such as S7-200, S7-300, S7-400

Finally, select the specific CPU model PLC

Note: Storage capacity is determined. Note that when there are analog signals present in the system or when a large amount of data processing is required, the storage capacity should be selected to be larger.

 

Siemens PLC Model Description

Naming rules for Siemens product order numbers:

Taking 6ES7 221-0BA23-0XA0 as an example,

6ES – Automation System Series

7—7: S7 series, 5: S5 series

2–2:200 series, 3:300 series, 4:400 series

2——1：CPU，2：DI/DO，3：AI/AO， 4: Communication module, 5: Functional module

1—1: Input, 2: Output, 3: Input/Output (for digital quantities)

 

1BF – Input/output voltage level, type, number of points, etc. There are many of them, so it is better to check the samples

Version 22- If the last digit is different, it can basically be used interchangeably

0XA0

So the above is a 200 switch input expansion module

Complete order number 6ES7 321-1BH01-0XA0

6ES7: S7 series PLC module

 

3: 300 series

2: Digital quantity (1 for CPU, 3 for analog, 4 for communication, 5 for functionality)

1: Input (2 for output, 3 for input-output)

1: Function level (the larger the number, the stronger the function)

B: Transistor (H is a relay, F is AC, if it is an analog quantity, K is a universal type, P is a temperature signal)

H: 16 o’clock, (L represents 32 points, F is 8 points, D is 4 points, B is 2 points)

01: Version number, 0.1 version

0XA0: suffix, used to describe special functions.