The product IIoT Libraries contains numerous libraries to support different communication protocols, for example MQTT and HTTPS, and includes tools for encoding and decoding data structures, for example JSON and XML. Moreover, libraries with POUs for direct communication with cloud services of individual providers (AWS, Azure, etc.) are provided. The components contained in the CODESYS package are ideally suited for communication in the IIoT environment.
Libraries for communication
The CODESYS software package includes a library with function blocks for communicating with a web server via HTTP or HTTPS.
- The HTTP method GET requests data from a web server.
- The HTTP methods POST and PUT submit data from the controller to a web server.
- When using DELETE, data is deleted from a web server.
- The HTTP method HEAD returns the HTTP header.
The HTTP header of a request can be extended without any restrictions. In addition, function blocks are included for HTTP basic authentication and authentication via OAuth (Version 1a and 2).
MQTT (Message Queuing Telemetry Transport) is an open-source IoT protocol that allows for the transmission of telemetry data as messages between devices. Device communication always takes place by means of an MQTT broker, e.g. Eclipse Mosquitto. Messages are sent and subscribed to based on topics. A topic corresponds to a path, e.g. device1/temperature. Subscribing to messages is done by specifying a topic filter. Wildcards are also permitted (+ for one level and # for multiple levels). The message format is not fixed, which means that a JSON string or any data structure can be transmitted.
With the MQTT Client library, messages can be sent from a CODESYS controller to an MQTT broker, and messages can be subscribed based on topics.
This library contains function blocks for sending, receiving, and deleting emails by means of SMTP and POP3 protocols. Communication with the mail server can be established either encrypted (TLS) or unencrypted. A sample project demonstrates how to use the function blocks.
With this library it is possible to send, receive and delete short messages via a GSM modem.
This library makes it possible to read device information of printers, routers etc. via the SNMP protocol. The library provides function blocks to send and receive SNMP messages. The package contains the SNMP library and example applications.
Supported SNMP features:
- SNMP GET: Request a value.
- SNMP GET_NEXT: Request a value and get the OID from the next value.
- SNMP Agent: Enables devices to request values from the control (agent).
- SNMP TRAP: Send and receive TRAP/INFORM telegrams.
- SNMP SET: Set values via SNMP.
SNMP Service SL.package contains following components:
- SNMPServiceSL (Namespace: SNMP)
- Project with example applications
- CHM help
- Product data sheet
The library SNTP Service contains function blocks for easy implementation of SNTP client and server components on a CODESYS control (SNTP V3, SNTP V4). The function block
SNTPGetUTCTime can be used to request the UTC time of a SNTP/NTP server. The function block
SNTPServer can be used to build a simple SNTP server.
Function blocks (FBs) of the SNTP library:
SNTPGetUTCTime: FB to request the time of a SNTP server (SNTP client)
SNTPServer: FB to send the local server time (SNTP server)
AWS IoT Core Client
The AWS IoT Core service is a managing cloud platform from Amazon in which connected devices can work together easily and safely with cloud applications and other devices. The “AWS IoT Core Client” library provides function blocks for sending and receiving messages. Communication is encrypted and takes place by means of the MQTT protocol. In the AES environment, messages are typically transmitted in JSON format. The “JSON Utilities” library can be used for parsing and creating JSON files.
Azure IoT Hub Client
The Azure IOT Hub cloud service from Microsoft directly links IoT devices. For more detailed information, refer to IoT Hub I Microsoft Azure. The Azure IoT Hub Client library provides function blocks for sending and receiving messages. A sample project demonstrates how to use the library.
Google Cloud IoT Core Client
The Google Cloud IoT Core cloud service from Google is a service for directly connecting IoT devices. For more information, see Google Cloud IoT Core.
The Google Cloud IoT Core Client library provides function blocks for sending and receiving messages. A sample project demonstrates how to use the library.
JSON Web Token
The JSON Web Token library contains a function block for creating a JWT (JSON Web Token) on the controller. For this purpose, the algorithms HS256, HS384, HS512, and RS256 are supported.
The JSON Web Token package contains the following components:
- IEC 61131-3 library
JSON Web Token SL(namespace JWT)
- Sample project
JSON Web Token SL Example.project
- Programming reference as integrated CHM help
- Product data sheet (German and English)
Libraries for reading and writing of data structures
CSV Utility provides function blocks to read and write CSV files. The library contains the components
CSVReader (read a CSV file) and
CSVWriter (write a CSV file). All function blocks can be used in a classical or object oriented way. An example project demonstrates the usage of all components.
INI File Utility
The product INI File Utility is a library to read and write INI files. The library contains function blocks to read, write and find values of INI files. An example project shows the usage of the library and their function blocks.
Content of the package:
INI File Utility SL(Namespace:
- Example project with visualization to read, write and find values of INI files
- CHM help file
The JSON Utilities library provides the following functionalities:
- Read JSON files (UTF-8 and UTF-16)
- Read JSON byte arrays
- Write JSON files (UTF-8 and UTF-16)
- Read JSON byte arrays
- Search for keys, values, and child and parent elements
The data is stored in an array of structures. Data access and element search is performed by means of methods from the
JSONData function block. The simple creation of a JSON-File can be realized with funcion block
JSONBuilder. The function blocks
JSONFileReader read data in JSON format and save the values in the
JSONData function block. Writing files and byte arrays is performed by means of the function blocks
A simple REST client can be implemented easily in connection with the library "Web Client".
The library XML Utility contains function blocks to read and write xml files or xml strings on a control. All elements of the xml file are stored in an array of structures. The library also contains function blocks to find elements by name and attribute. The usage of the library is demonstrated by two example applications.
The library contains following components:
- IEC 61131-3 library
XML Utility SL(Namespace XML)
- Example project
XML Utility SL Example.project
- Integrated CHM programming reference
- Product data sheet (de und en)
MQTT Client App
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The CODESYS Group is one of the world's leading software manufacturers in the automation industry. At its headquarters in Kempten/Germany and its subsidiaries in China, Italy and the United States, the group currently employs 200 people. The CODESYS Group focuses on developing and marketing the manufacturer-independent IEC 61131-3 automation suite CODESYS and the associated product portfolio. CODESYS covers the complete software side of automation. Core products of the market-leading automation suite are the CODESYS Development System, the corresponding platform-independent control system CODESYS Control and the CODESYS Automation Server, the cloud-based industry 4.0 platform. The customers of the group, founded in 1994 by Dieter Hess and Manfred Werner, come from all areas of automation: manufacturers of industrial controls as well as their users or operators who automate or operate machines and systems with CODESYS.
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