VIPA IM 253 DP Series, Manual, Page: 49 / 100

Manual VIPA System 200V Chapter 3 Deployment IM 253DP
HB97E - IM - RE_253-xDPxx - Rev. 12/44 3-9
PROFIBUS employs screened twisted pair cable on the basis of the RS485
interfaces or a duplex fiber optic link (FO). The data transfer rate of both
systems is limited to a max. of 12MBaud.
For details please refer to the "Assembly and installation guidelines".
The RS485 interface uses differential voltages. For this reason this kind of
interface is less susceptible to interference than a plain voltage or current
based interface. The network may be configured as linear or as tree
structure. Your VIPA PROFIBUS coupler carries a 9pin socket. This socket
is used to connect the PROFIBUS coupler to the PROFIBUS network as a
slave.
Due to the bus structure of RS485, any station may be connected or
disconnected without interruptions and a system can be commissioned in
different stages. Extensions to the system do not affect stations that have
already been commissioned. Any failures of stations or new devices are
detected automatically.
The fiber optic system employs pulses of monochromatic light. The optical
waveguide is not susceptible to external electrical interference. Fiber optic
systems have a linear structure. Each device requires two lines, a transmit
and a receive line. It is not necessary to provide a terminator at the last
device.
Due to the linear structure of the FO data link, it is not possible to install or
remove stations without interruption to data communication.
Every device on the PROFIBUS is identified by an address. This address
must be an unique number in the bus system between 1 and 126. The
address of the VIPA PROFIBUS coupler is set by the addressing switch
located on the front of the module.
You assign the address to the VIPA PROFIBUS master during the
configuration phase.
Data transfer
medium
Electrical system
based on RS485
Optical system
using fiber optic
data links
Addressing