Hirschmann GREYHOUND GRS1020, Справочное руководство

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Industry Protocols
234
UM Config GRS
Release 8.0 09/2019
15 Industry Protocols
For a long time, automation communication and office communication were on different paths. The
requirements and the communication properties were too different.
Office communication moves large quantities of data with low demands with respect to the transfer
time. Automation communication moves small quantities of data with high demands with respect to
the transfer time and availability.
While the transmission devices in the office are usually kept in temperature-controlled, relatively
clean rooms, the transmission devices used in automation are exposed to wider temperature
ranges. Dirty, dusty and damp ambient conditions make additional demands on the quality of the
transmission devices.
With the continued development of communication technology, the demands and the
communication properties have moved closer together. The high bandwidths now available in
Ethernet technology and the protocols they support enable large quantities to be transferred and
exact transfer times to be specified.
With the creation of the first optical LAN to be active worldwide, at the University of Stuttgart in
1984, Hirschmann laid the foundation for industry-compatible office communication devices.
Thanks to Hirschmann's initiative with the world's first rail hub in the 1990s, Ethernet transmission
devices such as switches, routers and firewalls are now available for the toughest automation
conditions.
The desire for uniform, continuous communication structures encouraged many manufacturers of
automation devices to come together and use standards to aid the progress of communication
technology in the automation sector. This is why we now have protocols that enable us to
communicate via Ethernet from the office right down to the field level.
Figure 52: Example of communication.
Input Output
Ethernet
Input
Output