Key Concepts and Terms

The Devices module facilitates seamless communication and data exchange with various field devices and industrial protocols, simplifying system architecture and enhancing connectivity. The configuration of the Devices module is performed in the following sections:

Protocols

Rules for communication between devices. The software supports various communication protocols.

Channels

Configured to handle specific communication protocols and drivers, defined by protocol driver and connection type (e.g., RS-232, TCP/IP). Multiple channels can be defined for the same protocol.

Nodes

A Node is the Device Module object that defines the settings for physical devices, using the protocol specified in the DeviceChannel. Each Node contains one or more DevicePoints.

Points

Individual items that are read from or written to Nodes, bound to a specific tag.

AccessTypes

Each Point is associated with an AccessType, which defines the rules for reading and/or writing values for that Point. Some rules that can be set include the polling rate, whether a read is performed on startup, and whether values can be written to that Point. The AccessType allows users to configure how clients can access data points in the system.

Understanding the Devices Module

The Device Module collects data from the field and feeds it into the solution’s tags.

Module Features

• Simplifies architecture by removing the need for additional communication products.

• Supports on-premise, edge, enterprise-level, and cloud communication.

• Includes a built-in MQTT Broker and OPC Server.

• Provides MQTT SparkPlug B and OPC-UA simulators for demos and prototyping.

• Features a Driver Toolkit for adding new interfaces.

Native Communication Drivers

Our software supports numerous communication native communication protocols for HMI and industrial device interaction.

→ See the list of available Communication Drivers

Standard protocols, such as OPC-UA, are also included, but for many devices, it's highly advantageous to use the native communication driver.

→ See more on Native vs OPC drivers.

Driver Development and Advanced Diagnostics

When using the platform, you don't need to understand the details of the protocol implementation because you can easily map the devices and the information you want to read or write from the device with our standard tools. 

However, if you need to implement new protocols or require a deeper understanding of their inner workings for diagnostics or optimization purposes, it is necessary to understand the details of protocol implementation.

→ See more at Protocol Implementation Concepts. 

Channels. Nodes and Points

When using the Devices module, you can use multiple protocols simultaneously.

• Channels: Define the protocol to be executed and the settings for that protocol.

• Nodes: Stations in the field network connected via the protocol. The Node configuration selects the Channel to define the protocol and its settings. Each Node will have the mapping for one or more Points.

• Points: Addresses within Nodes that are read from or written to on each Node.

When the system is running, it organizes the requests to maximize performance by creating groups when possible or opening a process for each Channel and multiple threads for each Node.

The exact behavior is dependent on the protocol characteristics.

Handling Read And Write Events

AccessType defines the read/write rules for each point, including when write events occur (on tag value change or external trigger) and when read events occur (typically timer-based).

When a Read or Write event occurs, the platform will verify all affected Tags and Addresses, and send out the protocol messages, optimized according to the specifications of the selected protocols.

Communication feedback is available on the tag Quality property or system status variables, such as Device.Node.Node1.Status.

Configuring the Devices Module

Configuration Workflow

Simulator Drivers

The TSimulator driver is a communication protocol that allows users to generate random values in a variety of data types for testing and validation purposes. It is designed to be used with the Devices module and provides a set of flexible options that enable users to create accurate and customized simulations for their systems. TSimulator supports multiple data types, including BOOL, INTEGER, FLOAT, STRING, RAMP, and SINE. For each data type, the user can configure the minimum and maximum values that the simulation can reach, as well as other options such as string length for the STRING type or ramp step for the RAMP type.

Other simulators available:

1. ValueSimulator (internal driver)
2. OPC UA Simulator (external simulator)
3. MQTTspB Simulator (external simulator)
4. Modbus Protocol Simulator (external simulator)

Working with the Devices Module

Monitor Runtime Execution

You can control and monitor the Devices Module execution while running your solution in the Designer tool.

You can Run, Pause, or Stop the Historian module directly from the platform. Navigate to Runtime / Runtime Diagnostics to find the three buttons that you can use to control the module.

Navigate to Devices / Monitor, to see a table with current status of all Device Nodes.

Using Data Quality on Displays

Monitors can display and utilize the data quality of communication tags to ensure that accurate and reliable information is presented to operators.

Devices Advanced Topics 

Importing PLC Addresses 

Simplify the creation of communication Nodes and Point Addresses with various methods for automatic data configuration import. Users can copy and paste tables from Excel, import data from CSV files, and employ various Import Wizards for diverse data sources. 

→ Read more about Importing PLC Addresses.

Native Driver vs OPC Server

Presents the additional set of features when using the native protocol for the Devices, instead of a third-party vendor OPC Server.

→ Read more about  Native Driver vs OPC Server

Protocol Implementation Concepts

Deeper discussion on Protocols, intended to those who develop communication drivers, or require advanced diagnostics in existing protocols. 

→ Read more about  Protocol Implementation Concepts

Devices Module vs TagProvider Connections

While both the Devices module and TagProvider Connections facilitate data exchange, they have different focuses and are applied to distinct types of interaction with data, aiming to meet different requirements.

→ Read more about Devices Module and TagProviders

Devices Runtime Attributes

The Devices Namespace exposes properties and methods from the .NET objects used by the Device Module execution. 

→ Read more on the page Devices Advanced Topics.

Best Practices and Troubleshooting 

Best Practices and Recommendations

System Design

Plan and design your industrial automation system with scalability and maintainability in mind. Use a modular approach, separating responsibilities between devices, ExternalTags, and other modules. This promotes efficient workflows and simplifies system management.

Documentation

Keep thorough documentation of your system, including device configurations, communication settings, and customizations. This will help with troubleshooting, maintenance, and future system upgrades.

Training

Ensure that operators and maintenance personnel are well-trained in using the platform and understand the specific configurations of your system. This will enable them to identify and resolve issues efficiently, minimizing system downtime.

Regular Maintenance and Updates

Schedule regular maintenance for your system, including software updates, hardware inspections, and performance assessments. This proactive approach will help to identify potential issues before they escalate, ensuring the reliability and performance of your industrial automation system.

Built-in Diagnostics tools

There are three built-in tools for diagnostics of the software solution and runtime: PropertyWatch, TraceWindow and ModuleInformation.

Common Issues and Solutions

ControlLogix PLC Type

In the PLC Address Import section under Devices / Points, it is important to ensure that the correct protocol option is selected when connecting ControlLogix PLCs. In some cases, the default option "Model OTHERS" may not work correctly, and it may be necessary to select a specific model, such as "Model 1756-L8X". If you encounter issues with a ControlLogix Channel not sending or receiving values, try changing the protocol option to the specific model and test the communication.

ControlLogix Micro850

In the current version of the driver, specifically the Micro850 model (accessed in Devices / Channels / ProtocolOptions / Model), an error occurs when importing tags into the device node using the "From Device" option, which is expected due to the way the driver's API was implemented. We have a solution for this, which involves importing using the "From Filename" option. Our platform only accepts files in the .L5K format, in the case of .xlsx files or similar, it is necessary to open them in a table editor, make the necessary modifications, and export as .CSV, which can then be imported in Solution Settings / Import Tags / CSV File.

It's important to pay attention to the slots of the nodes because, depending on the configurations, it may only work with a specific slot depending on the physical architecture of how the PLC is set up, for example slot 2.

From there, simply configure to synchronize using the "From Filename" option, and the connection will function correctly.

Importing L5K from ControlLogix

In the PLC Address Import section under Devices / Points, it is important to ensure that the path and file name are correct when importing L5K files using the "From Filename" or "From Device" options. In some cases, the "From Device" option may fail, and it may be necessary to use the "From Filename" option with the L5K file to make it work correctly.

Performance

Optimize the polling rates and access types for data points to reduce unnecessary data traffic and improve system performance. Use the OnDisplayOrServer, AccessType for efficient data reading when the application is using the data.

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