|
| |
Scope |
| PROFIBUS is a vendor-independent, open field bus standard
for a wide range of applications in manufacturing and process automation.
Vendor-independence and openness are ensured by the international
standards EN 50170, EN 50254 and IEC 61158. PROFIBUS allows
communication between devices of different manufacturers without any
special interface adjustment. PROFIBUS can be used for both high-speed
time critical applications and complex communication tasks. Through its
continuing further technical developments, PROFIBUS is still the
industrial communication system prepared for the future. |
PROFIBUS offers functionally graduated communication
protocols (Communication Profiles): DP and FMS. Depending on the
application, the transmission technologies (Physical Profiles)
RS-485, IEC 1158-2 or fiber optics are available. In the course of further
technical development, the PROFIBUS User Organization is currently working
on the implementation of universal concepts for vertical integration on
the basis of Ethernet TCP/IP. Application Profiles define the
options of protocol and transmission technology required in the respective
application area for the individual device types. These profiles also
define vendor-independent device behavior.
|
| Communication
Basics of PROFIBUS |
| PROFIBUS
defines the technical characteristics of a serial field bus system with
which distributed digital programmable controllers can be networked, from
field level to cell level. PROFIBUS is a multi-master system and thus
allows the joint operation of several automation, engineering or
visualization systems with their distributed peripherals on one bus.
PROFIBUS distinguishes between the following types of device: |
| Master
devices determine the data communication on the bus. A master can send
messages without an external request when it holds the bus access rights
(the token). Masters are also called active stations. |
| Slave
devices are peripherals such as I/O devices, valves, drives and
measuring transducers. They do not have bus access rights and they can
only acknowledge received messages or send messages to the master when
requested to do so. Slaves are called passive stations. Since they only
require a small portion of the bus protocol, their implementation is
particularly economical. |
|
