Virtualized programmable logic controllers to allow multiple applications to run in parallel on the same hardware

A programmable logic controller comprising:

• a data processing unit
• at least one input,
• at least one memory area for application programs, wherein the programmable logic controller is configured to, during operation by an operating system, provide at least one virtual programmable logic controller including a first virtual programmable logic controller on which an application program is to run,
• a second memory area for application programs,
• wherein the programmable logic controller is configured to, during operation by the operating system, provide a second virtual programmable logic controller,
• wherein the operating system renders the programmable logic controller ready for operation to permit transmission of the application programs from resources outside the programmable logic controller to the first and second memory areas via an interface of the programmable logic controller,
• wherein the first virtual programmable logic controller and the second virtual programmable logic controller each run an application program in parallel and encapsulated from one another, and are used and programmed independently of each other, and wherein each of the first virtual programmable logic controller and the second virtual programmable logic controller are independently connected to a first output and a second output of the programmable logic controller, and
• wherein the programmable logic controller is further configured to simulate a virtual field bus that serves as interface between the at least one virtual programmable logic controller and the second virtual programmable logic controller, and provide a connection of the programmable logic controller to the at least one input and at least one output.