Modern automation systems provide for the availability to be accessed remotely and at any time. From this perspective, various users such as operators, maintenance crews and production managers need to have access to automation systems, and the security of each access needs to be guaranteed. In fact, authorizing different profiles of people to access the system remotely, means exposing the system to security issues that can involve data confidentiality and even command and control security problems. Typically, these accesses have to be managed in a simple and functional way, thus the Web Client technology is used increasingly.