ABB CTB811 HN800/CW800 side panel module
Fieldbus systems are used as a means of communications for serial data exchange
between decentralized devices on the field level and the controller of the process
supervision level.
PROFIBUS means PROcess FIeldBUS, designed as a fieldbus for process
automation purposes for interconnecting Decentralized Peripheral devices
(PROFIBUS DP), and its extended version for Process Automation (PROFIBUS
PA). It is well known all over the world and the most popular fieldbus in Europe.
Due to its high data transmission rates over short distances and moderate ones over
long distances it is predominantly used for interconnecting I/O units like S800 /
S900 or smart devices to PLCs and controller like AC 800M.
This user manual provides a brief overview of the PROFIBUS technology, to help you
by planning, commissioning and testing. It does not release you from the necessity to
observe the relevant standards. The valid version of the EMC directive and other
PROFIBUS guidelines and the shield and grounding directives, particular for
PROFIBUS-PA must be observed.
Data in this document are based on experiences, but do not replace however the
relevant standards and regulations as there are for example:
British Standard BS EN 50170
Euro Standard EN 50170
International Electrotechnical Commission IEC 61158
PROFIBUS Specification 0.032, FMS, DP, PA Specification
PROFIBUS Guideline 2.112, PROFIBUS DP/FMS Installation Guideline
PROFIBUS Guideline 2.092, PROFIBUS PA User and Installation Guideline
PROFIBUS Guideline 2.021 (draft in german), Optical Transmission Technics

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.