Evonik offers customers in the field of animal nutrition fully automated dosing systems for the precise control of amino acid additives. Together with Evonik staff, emlix has developed the software system for the control computers, which will be maintained remotely.
The system is operated using a Qt-based application via the control computer in the dosing unit, through which the condition of the equipment can be visualized. Consumption and operating data are also determined.
In the first phase a maintainable embedded-Linux-based software platform was put together using the software management and build system e2factory. On this basis, the programmable logic controller (PLC) as well as the sensors and actuators of the unit were integrated using various serial interfaces and Ethernet.
With the help of a Qt-based application, functions of the equipment were made easily controllable for the operator. A mechanism for the selective updating of the operating system and application was integrated using procedures for secure authentication and authorization.
To achieve this, the files are encrypted, signed and transferred to the system power-fail-safe via USB stick. The recognition of authorized updates takes place automatically.
Using the same process in the opposite direction, log, operating and configuration data for the plant can be compiled with password protection for later use, thereby simplifying maintenance and error analysis for the service technicians.