C#读取西门子S7系列PLC教程及源码Profinet_c#s7plc-网络基础文档类资源-CSDN文库

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C# 读取西门子S7系列PLC教程及源码.rar （2个子文件）

Home · S7NetPlus_s7netplus Wiki · GitHub.pdf 583KB

s7netplus-develop.zip 1.04MB

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S7.Net documentation

How to download s7.Net

The official repository is on GitHub (https://github.com/killnine/s7netplus), you can also download the library

directly from NuGet (https://www.nuget.org/packages/S7netplus/).

What is S7.Net

S7.Net is a plc driver that works only with Siemens PLC and only with Ethernet connection. This means that your

plc must have a Profinet CPU or a profinet external card (CPxxx card). S7.Net is written entirely in C#, so you can

debug it easily without having to go through native dlls.

Supported PLC

S7.Net is compatible with S7-200, S7-300, S7-400, S7-1200, S7-1500.

Getting started with S7.Net

To get started with S7.Net you have to download and include the S7.Net.dll in your project. You can do this by

downloading the NuGet package, or by downloading the sources and compile them.

Create a PLC instance, connect and disconnect

To create an instance of the driver you need to use this constructor:

cpu: this specify what CPU you are connecting to. The supported CPU are:

Code Issues 67 Pull requests 7 Actions Projects 2 Wiki Security Ins

public Plc(CpuType cpu, string ip, Int16 rack, Int16 slot)

public enum CpuType {

S7200 = 0,

S7300 = 10,

S7400 = 20,

S71200 = 30,

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ip: specify the IP address of the CPU or of the external Ethernet card

rack: this contains the rack of the plc, that you can find in hardware configuration in Step7

slot: this is the slot of the CPU, that you can find in hardware configuration in Step7

Example:

This code creates a Plc object for a S7-300 plc at the IP address 127.0.0.1, for a plc in rack 0 with the cpu in slot

Connecting to the PLC

For example this line of code open the connection:

Disconnecting from the PLC

For example this closes the connection:

Error handling

Any method can cause a

PlcException

on various errors. You should implement a proper error handling. The

PlcException

provides an

ErrorCode

and an adequate error message.

These are the types of errors:

S71500 = 40,

}

Plc plc = new Plc(CpuType.S7300, "127.0.0.1", 0, 2);

public void Open()

plc.Open();

public void Close()

plc.Close();

public enum ErrorCode

{

NoError = 0,

WrongCPU_Type = 1,

ConnectionError = 2,

IPAddressNotAvailable,

WrongVarFormat = 10,

WrongNumberReceivedBytes = 11,

SendData = 20,

ReadData = 30,

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Check PLC availability

To check if the plc is available (opens a Socket) you can use the property

When you check this property, the driver will try to connect to the plc and returns true if it can connect, false

otherwise.

Check PLC connection

Checking the plc connection is trivial, because you have to check if the PC socket is connected but also if the

PLC is still connected at the other side of the socket. The property that you have to check in this case is:

This property can be checked after you called the method Open() and the result was a success, to check if the

connection is still alive.

Read bytes / Write bytes

The library offers several methods to read variables. The basic one and the most used is ReadBytes.

This reads all the bytes you specify from a given memory location. This method handles multiple requests

automatically in case the number of bytes exceeds the maximum bytes that can be transferred in a single

request.

dataType: you have to specify the memory location with the enum DataType

WriteData = 50

}

public bool IsAvailable

public bool IsConnected

public byte[] ReadBytes(DataType dataType, int db, int startByteAdr, int count)

public void WriteBytes(DataType dataType, int db, int startByteAdr, byte[] value)

public enum DataType

{

Input = 129,

Output = 130,

Memory = 131,

DataBlock = 132,

Timer = 29,

Counter = 28

}

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db: the address of the dataType, for example if you want to read DB1, this field is “1”; if you want to read

T45, this field is 45.

startByteAdr: the address of the first byte that you want to read, for example if you want to read

DB1.DBW200, this is 200.

count: contains how many bytes you want to read.

value[ ]: array of bytes to be read from the plc.

Example: This method reads the first 200 bytes of DB1:

Read and decode / Write decoded

This method permits to read and receive an already decoded result based on the varType provided. This is

useful if you read several fields of the same type (for example 20 consecutive DBW). If you specify VarType.Byte,

it has the same functionality as ReadBytes.

dataType: you have to specify the memory location with the enum DataType

db: the address of the dataType, for example if you want to read DB1, this field is “1”; if you want to read

T45, this field is 45.

startByteAdr: the address of the first byte that you want to read, for example if you want to read

DB1.DBW200, this is 200.

varType: specify the data that you want to get your bytes converted.

var bytes = plc.ReadBytes(DataType.DataBlock, 1, 0, 200);

public object Read(DataType dataType, int db, int startByteAdr, VarType varType, int varCount)

public void Write(DataType dataType, int db, int startByteAdr, object value)

public enum DataType

{

Input = 129,

Output = 130,

Memory = 131,

DataBlock = 132,

Timer = 29,

Counter = 28

}

public enum VarType

{

Bit,

Byte,

Word,

DWord,

Int,

DInt,

Real,

String,

StringEx,

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