APPENDIX C - PROFIBUS DETAIL
C.1 Introduction
The PROFIBUS Option supports the PROFIBUS-DP variant of the PROFIBUS protocol which is
designed especially for communication between automatic control systems and distributed I/O at the
device level. It is most often used to allow a central Programmable Logic Controller or PC based
control system to use external „slave‟ devices for I/O or specialized functions. The principal advantage
is that these devices may be distributed around a machine, thereby saving on the cost of point to
point wiring. The „open‟ nature of the network also permits equipment from different manufacturers to
be mixed on the same bus.
C.2 Communication Protocol
PROFIBUS is a vendor independent, open field bus standard for a wide range of applications in
manufacturing, process and building automation. Vendor independence and openness are
guaranteed by the PROFIBUS standard. With PROFIBUS, devices from different manufacturers can
inter-communicate. Suitable interfaces exist for PLCs, which include the Siemens, Mitsubishi and
Allen Bradley range.
The PROFIBUS-DP network uses a high speed version of the RS485 standard, permitting baud rates
of up to 12Mbaud. A maximum of 32 PROFIBUS-DP stations (nodes) may be contained within a
single network segment. Use of RS485 repeaters allows a total of up to 126 stations. PROFIBUS-DP
is a multimaster, master-slave, token passing network. More detailed information, including a detailed
guide to products available, may be obtained from the various world-wide PROFIBUS user
organizations. You will find contact information in trade magazines or by reference to
http://www.profibus.com on the World Wide Web.
PROFIBUS is available in two other types, aimed at different application areas, as follows:
1. PROFIBUS-PA is designed especially for process automation. It permits sensors and actuators to
be connected on one common bus line even in intrinsically safe areas. PROFIBUS PA permits data
communication and power over the bus, using intrinsically safe, 2-wire technology according to the
international standard IEC 1158-2, but may also be used on the standard RS485 cabling for non-
intrinsically safe applications.
2. PROFIBUS-FMS is the general purpose solution for communication tasks at the cell level.
Refer following Addresses of different parameters for Profibus Communication
Table 76 Addresses for Profibus Communication
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