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Siemens S7 Client Library For .Net

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# Siemens S7 Client Library For .Net

[![Nuget Total Downloads](https://buildstats.info/nuget/s7_client)](https://www.nuget.org/packages/s7_client)

## Overview
s7_client is a simple and fast .Net library which communicates with Siemens S7 devices using Siemens S7 Protocol.

s7client is the synchronous version of [async_s7_client](https://github.com/ermanimer/async_s7_client) and it is designed to be used with Timers and BackgroundWorkers.

## PLC Settings For Data Access
* **S7 300, S7 400**: Default settings allow full access for these cpus.
* **S7 1200, S7 1500**: Only global data blocks can be accessed. The optimized block access option must be turned off. The access level must be full and connection mechanism must allow GET/PUT.

## Installation
Download the latest release from [here](https://github.com/ermanimer/s7_client/releases "Releases") and add reference to your project or run the following command in Nuget Package Manager Console.

PM> Install-Package s7_client

## Constructor
* #### S7Client(string ipAddress, ushort port, ushort rack, ushort slot)
    * ##### Parameters:
        * **ipAddress**: Ip address of the remote device.
        * **port**: Port of the remote device. The default port is 102 for Siemens S7 Protocol.
        * **rack**: Rack number of the remote device.
        * **slot** : Slot number of the remote device.
        
        Rack and slot numbers for supported Cpus:
        
        | Cpu | Rack | Slot | Description |
        | :---| :--: | :--: | :---------- |
        | S7 300 | 0 | 2 | Always |
        | S7 400 | - | - | Follow the hardware configuration |
        | S7 1200 | 0 | 0 | Or 0, 1 |
        | S7 1500 | 0 | 0 | Or 0, 1 |
        
    * ##### Example:
        ```c#
        S7Client s7Client = new S7Client("192.168.0.1", 102, 0, 0);
        ```
 
 ## Properties
* #### Busy:
    Gets a bool value indicating whether the S7Client is running a task.
    
* #### Connected:
    Gets a bool value indicating whether the S7Client is connected to a remote device.

* #### PduLength:
    Gets a ushort value indicating the process data unit length of the remote device.
    
## Methods
* #### Connect()
    Connects to the remote device. Returns **Connected** property.
    * ##### Example:
        ```c#
        private void buttonConnect_Click(object sender, EventArgs e) {
            try {
                //connect to remote device
                bool result = s7Client.Connect();

//print result
                Debug.WriteLine(result.ToString());
            }
            catch(S7ClientException s7ClientException) {
                Debug.WriteLine(s7ClientException.ToString());
            }
        }
        ```
    * ##### Exceptions:
        Throws only S7ClientException.
        
        | Exception Code | Exception Message |
        |:--------------:| :---------------- |
        | 1 | Hostname or port is not valid. |
        | 2 | Tcp connection failed. |
        | 3 | Network stream failed. |
        | 4 | Iso connection failed. |
        | 5 | Pdu negotiation failed. |
        | 9 | S7Client is busy. |

* #### Close()
    Disposes the tcp client instance and requests that the underlying tcp connection be closed. Returns a bool indicating whether the task is successfully completed.
    * ##### Example:
        ```c#
        private void buttonClose_Click(object sender, EventArgs e) {
            try {
                //close s7 client
                bool result = s7Client.Close();

//print result
                Debug.WriteLine(result.ToString());
            }
            catch(S7ClientException s7ClientException) {
                Debug.WriteLine(s7ClientException.ToString());
            }
        }
        ```
    * ##### Exceptions:
        Throws only S7ClientException.
        
        | Exception Code | Exception Message |
        |:--------------:| :---------------- |
        | 9 | S7Client is busy. |

* #### Read(ushort dataBlockNumber, uint startingAddress, ushort byteCount)
    Reads data from the remote device's specified data block. Returns a byte array indicating each data starting from the first data.
    * ##### Parameters:
        * **dataBlockNumber**: Number of the data block.
        * **startingAddress**: Starting address of the data.
        * **byteCount**: Byte count of the data.
    * ##### Example:
        ```c#
        private void buttonRead_Click(object sender, EventArgs e) {
            try {
                //read ten bytes from data block 1, starting from address 0. Ten bytes include 
                //one ushort (16-bit unsigned integer), one uint (32-bit unsigned integer) and 
                //one float (32-bit floating point number)
                byte[] readBytes = s7Client.Read(1, 0, 10);

//print ushort
                ushort _ushort = s7Client.GetUShort(readBytes, 0);
                Debug.WriteLine($"ushort : {_ushort.ToString()}");

//print uint
                uint _uint = s7Client.GetUInt(readBytes, 2);
                Debug.WriteLine($"uint : {_uint.ToString()}");

//print float
                float _float = s7Client.GetFloat(readBytes, 6);
                Debug.WriteLine($"float : {_float.ToString()}");
            }
            catch(S7ClientException s7ClientException) {
                Debug.WriteLine(s7ClientException.ToString());
            }
        }
        ```
    * ##### Exceptions:
        Throws only S7ClientException.
        
        | Exception Code | Exception Message |
        |:--------------:| :---------------- |
        | 6 | Byte count is out of range. |
        | 7 | Reading failed. |
        | 9 | S7Client is busy. |
        | 10 | S7Client is not connected to a remote device. |
    
* #### Write(ushort dataBlockNumber, uint startingAddress, byte[] bytesToWrite)
    Writes data to the remote device's specified data block. Returns a bool indicating whether the task is successfully completed.
    * ##### Parameters:
        * **dataBlockNumber**: Number of the data block.
        * **startingAddress**: Starting address of the data.
        * **bytesToWrite**: Bytes of data.
    * ##### Example:
        ```c#
        private void buttonWrite_Click(object sender, EventArgs e) {
            try {
                //write ten bytes to data block 1, starting from address 0. Ten bytes include 
                //one ushort (16-bit unsigned integer), one uint (32-bit unsigned integer) and 
                //one float (32-bit floating point number)
                byte[] bytesToWrite = new byte[10];

//bytes of ushort
                ushort _ushort = 1000;
                s7Client.SetUshort(bytesToWrite, 0, _ushort);

//bytes of uint
                uint _uint = 100000;
                s7Client.SetUInt(bytesToWrite, 2, _uint);

//bytes of float
                float _float = 3.14f;
                s7Client.SetFloat(bytesToWrite, 6, _float);

bool result = s7Client.Write(1, 0, bytesToWrite);

//print result
                Debug.WriteLine(result.ToString());
            }
            catch(S7ClientException s7ClientException) {
                Debug.WriteLine(s7ClientException.ToString());
            }
        }
        ```
    * ##### Exceptions:
        Throws only S7ClientException.
        
        | Exception Code | Exception Message |
        |:--------------:| :---------------- |
        | 6 | Byte count is out of range. |
        | 8 | Writing failed. |
        | 9 | S7Client is busy. |
        | 10 | S7Client is not connected to a remote device. |
  
## Exceptions
All S7ClientException codes and messages.

| Exception Code | Exception Message |
|:--------------:| :---------------- |
| 1 | Hostname or port is not valid. |
| 2 | Tcp connection failed.  |
| 3 | Network stream failed. |
| 4 | Iso connection failed. |
| 5 | Pdu negotiation failed. |
| 6 | Byte count is out of range. |
| 7 | Reading failed. |
| 8 | Writing failed. |
| 9 | S7Client is busy. |
| 10 | S7Client is not connected to a remote device. |

## Tests
* #### Test 01:
    | Cpu | Model | CPU Version | Test Date |
    | :-- | :---: | :---------: | :-------: |
    | S7 1200 | 1214C | V4.2 | 27.03.2019 |
    
    | Function Name | Result |
    | :------------ | :----- |
    | Read | Reads 222 bytes in under 10 milliseconds. |
    | Write | Writes 204 bytes in under 10 milliseconds. |
    
 ## References
 * **Snap7** : This code implements a small amount of S7 protocol which is completely covered in Snap7. Snap7 is a great open source project created by Dave Nardella. You can visit [Snap7 Homepage](http://snap7.sourceforge.net/) for more information.

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