In industrial automation, engineering tools are used to plan and install components for automation facilities. These tools can also be used for maintainance and offer diagnosis functionality to locate defects. Most of them are Windows-based programs that are used on desktop-computers and laptops. For exchange of data between automation devices and these computers, wired connections are used. In case of errors, this can be a problem, if the distance between the faulty device and the maintenance-computer is large, or there is no way to use a laptop at the location of the device. Mobile devices like smartphones or tablets have advantages in these cases. They work mainly wireless over diverse communication protocols and are usually smaller. Applications on mobile devices can also be used with rich graphics and use performant components to be able to execute complex programs on them. ^In the context of this thesis, the changes and advantages from mobile applications for the use in industrial automation shall be examined. At the beginning, use cases shall be defined for the possible functions that can be executed by applications on mobile devices. From these use cases, requirements are derived. In the following chapter, several wireless communication protocols are explained, that are currently used in mobile devices, and analyzed, if they are compatible with the requirements of the given use cases. The next chapter gives an overview of „best practices“ related to software engineering methods. In addition, prominent operating systems of mobile devices are discussed. Furthermore, a prototype application, that was assembled to show typical functions that are offered by engineering tools, is shown. The last chapter analyzes the economic aspect of mobile applications, especially in industrial automation setups. ^Finally, findings of interviews conducted with a number of people working in the field of automation are presented that illustrate trends of mobile applications in the light of Industrie 4.0.