The PROFIBUS Protocols Section 1 Introduction
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The PROFIBUS Protocols
PROFIBUS is a manufacturer-independent fieldbus standard for applications in
manufacturing, process and building automation. PROFIBUS technology is
described in fixed terms in DIN 19245 as a German standard and in EN 50170 / IEC
61158 as an international standard. It specifies the technical and functional
properties of a serial bus system. The PROFIBUS standard is thus available to every
provider of automation product.
PROFIBUS distinguishes between master and slave. The masters determine the data
communication on the bus. A master can send messages without an external request
if it has access rights to the bus (token). The slaves are peripheral devices. Typical
slaves are I/O devices, valves, motors and transmitters. They have no bus access
rights. They can only confirm received messages or send a message on the request
of the master. Slaves are passive devices on the PROFIBUS.
PROFIBUS is composed of three types of protocol, each of which is used for
different tasks. Of course, devices with all three protocols can communicate with
each other in a complex system by means of a PROFIBUS network.
The three types of protocols are: PROFIBUS FMS, DP, PA.
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