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The paper describes a practical way of design and realization of one simple real time software, better say: executive system. It is applied on an own programmable logic controller - Microprocessor Measuring Station (MMS). In hardware point of view it is a modular unit based on M68HC11 microcontroller. All its functions are driven and controlled by a special real time working program, modular structure. Many program entities are running sequentially. The tasks are the main program elements. Because of many requirements and shortage of resources it was necessary to introduce a priority ordering in task execution. The paper explains some principles of software organization and task management. The results achieved in real environment are also included.
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