Fieldbus
9836 3123 01 223 (428)
15.8.3 InterBus/InterBus2MB
InterBus is normally used for industrial automation applications, such as valve, sensor and I/O unit control.
InterBus is used in many different types of industry, including: automobile industry, food industry,
building automation, plant construction, paper converting, wood processing and process engineering.
InterBus has a user organization called the InterBus Club. The organization assists members on a wide
variety of matters concerning InterBus. For more information, contact the InterBus Club:
http://www.interbusclub.com
The media used by InterBus is a shielded copper cable consisting of three twisted pairs. Two of these pairs
are used for the bus connection and in the last pair only one cable is used. This cable is used to earth the
bus. The baud rate for the bus is 500 Kbit/s with a total amount of data of 4096 I/O points.
The Power Focus InterBus module is to be used on InterBus remote bus networks. In applications where it
is necessary to exchange large amounts of data and where a parallel application interface is required,
InterBus is the preferred option.
InterBus has two ways of exchanging data. The first way is a fast cyclical I/O data, called process data.
The other is a somewhat slower protocol called PCP, which is mainly used for configuring and setting the
parameters of a device. The Power Focus InterBus module supports up to 10 words on the bus, out of
which none, one, two or four words may be selected to act as the PCP –channel, necessary if the PCP-
protocol required.
The PCP version supported by the module is version 2.0, which is fully backwards compatible.
When using InterBus master boards where the PCP channel is not supported, the maximum
input and output is 20 Bytes in and 20 Bytes out.
Physical interface
InterBus two differential lines.
Shielded copper cable, Three Twisted pair.
The bus is galvanically separated from the other electronics with two DC/DC converters. Bus signals are
isolated via optic couplers.
Module is based on SUPI 3 and SRE1 chip from Phoenix contact.
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