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# csharp-modbus-automation (WIP NOT COMPLETE)
This repository provides configuration files and source code for automating and interfacing with Modbus-compatible hardware devices. The target development environment is Windows 10, utilizing Visual Studio 2022 with C# and .NET Core/.NET 8+. Each hardware model is organized into a dedicated subdirectory within the repository.
## Warning
THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
`TL;DR: Not my problem`
## License
The `GPL V2` license applies to this project. All copyrights belong to their respective copyright holders and all trademarks belong to their trademark holders.
```
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.)

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This documentation is a WIP; excuse our dust.
https://www.sealevel.com/seai-o-463e/
https://www.sealevelsoftware.com/documentation/seamax/win/_enumerations.html
https://www.sealevelsoftware.com/documentation/seamax/win/sea_i_o46x_registers.html
https://www.sealevelsoftware.com/documentation/seamax/win/mbbd_seaio_463.html
https://github.com/NModbus/NModbus
https://github.com/NModbus4/NModbus4

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0-windows10.0.17763.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<AnalysisLevel>latest</AnalysisLevel>
<ProduceReferenceAssembly>True</ProduceReferenceAssembly>
<SignAssembly>True</SignAssembly>
<PlatformTarget>x64</PlatformTarget>
<GenerateDocumentationFile>False</GenerateDocumentationFile>
<PublishAot>True</PublishAot>
<PublishTrimmed>True</PublishTrimmed>
<EnforceCodeStyleInBuild>True</EnforceCodeStyleInBuild>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<GenerateAssemblyInfo>True</GenerateAssemblyInfo>
<CheckForOverflowUnderflow>True</CheckForOverflowUnderflow>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
<GenerateAssemblyInfo>True</GenerateAssemblyInfo>
<CheckForOverflowUnderflow>True</CheckForOverflowUnderflow>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="4.14.0">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>
<PackageReference Include="NModbus4" Version="2.1.0" />
<PackageReference Include="System.IO.Ports" Version="9.0.5" />
<PackageReference Include="System.Net.Sockets" Version="4.3.0" />
</ItemGroup>
</Project>

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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.14.36121.58
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ModBusReadRegisters", "ModBusReadRegisters.csproj", "{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}.Debug|Any CPU.Build.0 = Debug|Any CPU
{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}.Release|Any CPU.ActiveCfg = Release|Any CPU
{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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using Modbus.Device;
using System.Net.Sockets;
namespace ModbusReadRegisters
{
internal class Program
{
private const string IpAddress = "127.0.0.1"; // Replace with your Modbus device IP
private const int Port = 502; // Default Modbus TCP port
private const byte SlaveId = 1; // Modbus slave ID
private const ushort StartAddress = 0; // Starting address to read
private const ushort NumRegisters = 16; // Number of registers to read
private const ushort CoilStartAddress = 0; // Starting address to write coils
private static void Main(string[] args)
{
try
{
using (TcpClient client = new TcpClient(IpAddress, Port))
{
// Build a client, read registers, write to coils
ModbusIpMaster master = ModbusIpMaster.CreateIp(client);
ushort[] registers = ReadHoldingRegisters(master, SlaveId, StartAddress, NumRegisters);
DisplayRegisters(registers, StartAddress);
WriteCoilsBasedOnRegisters(master, registers, CoilStartAddress);
}
}
catch (Exception ex)
{
Console.WriteLine("An error occurred: " + ex.Message);
}
}
// Fetch holding register values with modbus TCP
private static ushort[] ReadHoldingRegisters(ModbusIpMaster master, byte slaveId, ushort startAddress, ushort numRegisters)
{
return master.ReadHoldingRegisters(slaveId, startAddress, numRegisters);
}
// Print registers we found and their values
private static void DisplayRegisters(ushort[] registers, ushort startAddress)
{
Console.WriteLine($"Read {registers.Length} registers starting at address {startAddress}:");
for (int i = 0; i < registers.Length; i++)
{
Console.WriteLine($"Register {startAddress + i}: {registers[i]}");
}
}
// If a register is occupied, write 1 to coil
private static void WriteCoilsBasedOnRegisters(ModbusIpMaster master, ushort[] registers, ushort coilStartAddress)
{
for (int i = 0; i < registers.Length; i++)
{
bool coilValue = registers[i] > 0;
master.WriteSingleCoil((ushort)(coilStartAddress + i), coilValue);
Console.WriteLine($"Wrote {(coilValue ? 1 : 0)} to coil address {coilStartAddress + i}");
}
}
}
}

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0-windows10.0.17763.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<AnalysisLevel>latest</AnalysisLevel>
<ProduceReferenceAssembly>True</ProduceReferenceAssembly>
<SignAssembly>True</SignAssembly>
<PlatformTarget>x64</PlatformTarget>
<GenerateDocumentationFile>False</GenerateDocumentationFile>
<PublishAot>True</PublishAot>
<PublishTrimmed>True</PublishTrimmed>
<EnforceCodeStyleInBuild>True</EnforceCodeStyleInBuild>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<GenerateAssemblyInfo>True</GenerateAssemblyInfo>
<CheckForOverflowUnderflow>True</CheckForOverflowUnderflow>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
<GenerateAssemblyInfo>True</GenerateAssemblyInfo>
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<ItemGroup>
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.14.36121.58
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ModBusReadRegisters", "ModBusReadRegisters.csproj", "{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}"
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Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
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{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}.Debug|Any CPU.Build.0 = Debug|Any CPU
{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}.Release|Any CPU.ActiveCfg = Release|Any CPU
{BBF0378B-1F80-4DD4-A9CD-BE480FD44B35}.Release|Any CPU.Build.0 = Release|Any CPU
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HideSolutionNode = FALSE
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GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {FF8A7498-5545-4152-901A-4CA0548E03CB}
EndGlobalSection
EndGlobal

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// This program connects to a Sealevel type 463E-OEM I/O processor https://www.sealevel.com/seai-o-463e-oem/
// Note: this program cannot be started until at least five seconds after powering up the I/O processor
// Note: if the program is interrupted and does not terminate normally, a power reset is required on the 463E
using Modbus.Device;
using System.Net.Sockets;
using static System.Console;
namespace ModbusReadRegisters
{
internal class ModbusProgram
{
private const string IPaddress = "10.10.10.110"; // Modbus device IP
private const int Port = 502; // Default Modbus TCP port
private const byte SlaveID = 247; // Modbus slave ID
private const ushort RegisterStartAddress = 0; // Starting address to read
private const ushort NumRegisters = 9; // Number of registers to read
private const ushort CoilStartAddress = 0; // Starting address to write coils
private static void Main(string[] args)
{
WriteLine("ModbusProgram begins here...\n\n");
try
{
using TcpClient client = new(IPaddress, Port);
// Build a client
ModbusIpMaster master = ModbusIpMaster.CreateIp(client);
WriteLine("CreateIp done\n");
// Read register values
ushort[] registers = master.ReadHoldingRegisters(SlaveID, RegisterStartAddress, NumRegisters);
WriteLine("ReadHoldingRegisters done\n");
DisplayRegisters(registers, RegisterStartAddress);
WriteLine("\nDisplayRegisters done\n");
// Set all channels as outputs
master.WriteSingleRegister(SlaveID, 2, 0);
WriteLine("WriteSingleRegister done.");
// Write to specific outputs
WriteIndividualCoils(master, registers, CoilStartAddress);
WriteLine("WriteIndividualCoils done\n");
// Write to groups of eight outputs at a time
WriteAllOutputs(SlaveID, master);
WriteLine("WriteAllOutputs done\n");
ShutDown(SlaveID, master);
}
catch (Exception ex)
{
WriteLine("An error occurred:\n\n" + ex.Message);
}
finally
{
WriteLine("\nModbusProgram ends here.\n");
_ = ReadKey(true);
}
}
// Print registers we found and their values
private static void DisplayRegisters(ushort[] registers, ushort startAddress)
{
WriteLine($"Read {registers.Length} registers starting at address {startAddress}:");
for (int i = 0; i < registers.Length; i++)
{
WriteLine($"Register {startAddress + i}: {registers[i]}");
}
}
// Exercise two racks, eight points at a time
private static void WriteAllOutputs(ushort slaveID, ModbusIpMaster master)
{
bool[] valueArrayON = [true, false, true, false, true, false, true, false];
bool[] valueArrayOFF = [false, true, false, true, false, true, false, true];
WriteLine("Writing to two boards at once:\n");
for (ushort j = 0; j < 4; j++)
{
for (ushort i = 0; i < 6; i++)
{
master.WriteMultipleCoils((byte)slaveID, (ushort)(i * 8), valueArrayON);
}
Thread.Sleep(150);
for (ushort i = 0; i < 6; i++)
{
master.WriteMultipleCoils((byte)slaveID, (ushort)(i * 8), valueArrayOFF);
}
}
}
// Execise individual outputs
private static void WriteIndividualCoils(ModbusIpMaster master, ushort[] registers, ushort coilStartAddress)
{
WriteLine("The value of 'coilStartAddress' is {0}", coilStartAddress);
for (int i = 0; i < registers.Length; i++)
{
WriteLine(registers[i]);
}
DisplayRegisters(registers, RegisterStartAddress);
for (ushort j = 0; j < 4; j++)
{
WriteLine("Turning the outputs ON.");
for (ushort i = 0; i < 48; i++)
{
master.WriteSingleCoil(SlaveID, i, true);
}
for (ushort i = 0; i < 48; i++)
{
master.WriteSingleCoil(SlaveID, i, false);
}
}
WriteLine("\nDone writing individual outputs!\n\n");
}
// Shut off all outputs
private static void ShutDown(ushort slaveID, ModbusIpMaster master)
{
bool[] valueArrayOFF = [false, false, false, false, false, false, false, false];
for (ushort i = 0; i < 6; i++)
{
master.WriteMultipleCoils((byte)slaveID, (ushort)(i * 8), valueArrayOFF);
}
}
}
}