S7PlcRx 1.3.2

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S7PlcRx

Reactive S7 PLC Communications Library

Introduction

S7PlcRx is a library that provides a simple interface to communicate with Siemens S7 PLCs.

Features

• Read and Write to PLC
• Read from PLC with Reactive Subscription

Getting Started

Installation

S7PlcRx is available on NuGet.

In the Siemens PLC program you need to enable PUT/GET communication in the PLC settings. You will also need to set any DBs you want to access to be non-optimized.

Package Manager

Install-Package S7PlcRx

.NET CLI

dotnet add package S7PlcRx

Usage

Setup Tags and Observe values in PLC

using S7PlcRx;

var plc = new RxS7(S7PlcRx.Enums.CpuType.S71500, "PLC_IP_ADDRESS", 0, 5);
// Add Tag without Polling
plc.AddUpdateTagItem<double>("Tag0", "DB500.DBD0").SetTagPollIng(false);
// Add Tag with Polling
plc.AddUpdateTagItem<double>("Tag1", "DB500.DBD8");

plc.IsConnected
    .Where(x => x)
    .Take(1)
    .Subscribe(async _ =>
    {
        Console.WriteLine("Connected");

        // Read Tag Value manually
        var tag0 = await plc.Value<double>("Tag0");
    });

// Subscribe to Tag Values
plc.Observe<double>("Tag0").Subscribe(x => Console.WriteLine($"Tag0: {x}"));
plc.Observe<double>("Tag1").Subscribe(x => Console.WriteLine($"Tag1: {x}"));
// Start Polling on previously disabled Tag
plc?.GetTag("Tag0")?.SetTagPollIng(true);

SetPolling

Polling is enabled by default when a Tag is added. You can disable and enable polling on a Tag at any time.

// Create a new Tag and with no Polling
plc.AddUpdateTagItem<double>("Tag0", "DB500.DBD0").SetTagPollIng(false);

// Set Polling on Tag
plc?.GetTag("Tag0")?.SetTagPollIng(true);

// Stop Polling on Tag
plc?.GetTag("Tag0")?.SetTagPollIng(false);

Write to PLC

plc.Value<double>("Tag0", 1.0);

Read PLC CPU Info

// Get CPU Info from PLC Async
var cpuInfo = await plc.CpuInfo();

// Get CPU Info from PLC Reactive
plc.GetCpuInfo().Subscribe(info =>
    {
    });

This returns a CpuInfo string Array with the following values: AS Name, Module Name, Copyright, Serial Number, Module Type Name, Order Code, Version.

Supported Data Types

• Bool - DB?.DBX?.?
• Byte - DB?.DBB?
• Byte[] - DB?.DBB? set length to number of bytes when creating array tags - example AddUpdateTagItem<byte[]>(PlcData, "DB100.DBB0", 64) - creates a tag with 64 bytes
• Int - DB?.DBW?
• Int[] - DB?.DBW?
• UInt - DB?.DBW?
• UInt[] - DB?.DBW?
• DInt - DB?.DBD?
• DInt[] - DB?.DBD?
• UDInt - DB?.DBD?
• UDInt[] - DB?.DBD?
• Real - DB?.DBD?
• Real[] - DB?.DBD?
• LReal - DB?.DBD?
• LReal[] - DB?.DBD?
• String - TODO - for the time being use a Byte Array
• Word - DB?.DBW?
• Word[] - DB?.DBW?
• DWord - DB?.DBD?
• DWord[] - DB?.DBD?

Further types will be added in the future.

Supported PLCs

• Logo-0BA8
• S7-200
• S7-300
• S7-400
• S7-1200
• S7-1500