
13-1
13.1 Introduction
e past two decades have brought tremendous advances in network technology, both in the oce world
and in all elds of automation. Two obvious indicators for this are on the one hand the stunning success
of the Internet, whose technological principles have also widely been adopted in small-size local area net-
works (LANs). On the other hand, the lengthy and erce struggle for an acceptable compromise in eldbus
standardization shows that the automation domain is seen as an important market by the big players.
Consequently, as networking in both worlds has reached a mature point, the recent years have seen many
attempts ...