Although they are interesting for many applications, wireless networks are regarded, particularly by industry, with some skepticism. One typical concern is security, although modern wireless networks include reasonable security mechanisms—in contrast to most existing wired field-level networks. Nevertheless, for hybrid heterogeneous networks, additional security concepts such as defense-in-depth approaches need to be integrated. A second concern is the dependability of wireless channels in automation applications. Many applications, in particular safety-critical ones, require media redundancy to achieve given reliability levels. While this problem is essentially solved for wired field-level networks (also for those based on Ethernet), it is still a research issue for the wireless domain. Concepts based on overlapping cells combined with seamless roaming, such as that presented in Section V, or completely redundant cells might be a step toward higher dependability. Reliability concerns are also the reason for industry to prefer relatively easy-to-plan infrastructure network setups, whereas dynamic ad hoc scenarios are still mainly of academic interest.