Adam 821x Manual page 123

Chapter 6 Deployment of the CPU 821xDP
Transfer medium
Electrical system
over RS485
Optical system via
optical waveguide
(OWG)
Addressing
GSD-file
6-6
As transfer medium Profibus uses an isolated twisted-pair cable based
upon the RS485 interface or a duplex photo cable. The transfer rate is for
both methods max. 12Mbaud.
More information about this topic is available at „installation guideline".
The RS482-interface is working with voltage differences. Though it is less
irritable from failures than a voltage or a current interface. You are able to
configure the network as well linear as in a tree structure. Your ADAM
Profibus coupler includes a 9pin slot where you connect the Profibus
coupler into the Profibus network as a slave.
The bus structure under RS485 allows an easy connection resp.
disconnection of stations as well as starting the system step by step. Later
expansions don't have any influence on stations that are already integrated.
The system realizes automatically if one partner had a fail down or is new
in the network.
The optical waveguide system uses monochromatically light impulses. The
optical waveguide is totally independent from disturbing voltage from other
machines. An optical waveguide system is built up linear. Every module
has to be connected with two links: one input link and one back. You don't
need to terminate the last module.
For the structure is a linear one, connecting and disconnecting stations is
not free of consequences.
Every partner of the Profibus network has to identify itself with a certain
address. This address may be existing only one time in the bus system and
has a value between 0 and 125.
At the CPU 821xDPM you choose the address via your software tool.
To configure the slave connections in your own configuration tool, you've
got all the information about your ADAM modules in form of an electronic
data sheet file.
Structure and content of this file are dictated by the Profibus User
Organization (PNO) and can be seen there.
Install this file in your configuration tool. Look for more information in the
online help of the according tool.
ADAM 8000 Manual CPU 821x – Rev 1.1
CPU ADAM 821x