Retain variables in Extended Retain Handling General retain memory concept Traditionally a PLC offers two types of memory: Volatile memory: values are lost on power down (usual RAM). Retain memory: values are kept during power down so these values can be restored on power return. Read More
Diagnostics If something goes not they way you want in your automation project, these methods will help to find and remedy the cause: Notifications Notifications of PLCnext Runtime Security Notifications of PLCnext Runtime Log files output.log PLCnextapp log Additional resources for… Read More
Global Data Space (GDS) The GDS enables communication relationships and data exchange between tasks and programs that were created in different programming languages. The GDS also ensures that inconsistencies as shown in the following example are prevented: While tasks are being processed and data is being exchanged… Read More
Managing components PLCnext Technology is based on components that are included via the IComponentInterface interface (see IComponent and IProgram). ACF – Application Component Framework The Application Component Framework (ACF) is a part of the System Manager and manages the function extensions. The ACF is a framework that enables… Read More
plcnextapp log file The plcnextapp tool manages apps, e.g. the mounting and unmounting. The plcnextapp tool is called by the AppManager. The plcnextapp.log file is used to record status and error messages that are issued by the plcnextapp tool. You will find the file by default on your controller under… Read More
Service Components – Overview Service Components are built-in benefits for programmers that come with the PLCnext Runtime System. Depending on the firmware release on your PLCnext Control, the set of features can be different. Find a detailed description to every service component via the respective link in the first column. Built-in communication… Read More
System Manager and PLC Manager System Manager PLCnext Technology is by definition an open platform. This means that as a user you can integrate your own components and programs. During firmware startup, the System Manager ensures that all integrated components and programs are configured and started in the correct… Read More
Core components of the PLCnext Technology PLCnext Technology is an open firmware platform executed on a Linux operating system with real-time patch. Different firmware components forming the core functions are called core components. These core components are a fixed part of the PLCnext Technology firmware. They cannot be modified. The core components… Read More
Function extensions A main feature of PLCnext Technology is the modular extensibility on user’s side, for example by means of so-called “function extensions”. How these function extensions differ from apps, see C++ programming on PLCnext Technology Function extensions for internal processes Users can add their own function extensions to PLCnext Technology. The… Read More
Execution and Synchronization Manager (ESM) PLCnext Technology also features task handling. The ESM performs task handling, monitoring and chronological sequencing of programs from different programming languages. Each processor core of a controller is managed by one ESM. One ESM is therefore assigned to one processor core. If a controller… Read More
