Communication protocols
PROGRAMMING MANUAL 167
Revision 3.0
4.4 PROFIBUS
4.4.1 Introduction
PROFIBUS is an international open fieldbus standard. The Trajexia
TJ1-PRT enables the Trajexia system to communicate with a
PROFIBUS network. It exchanges data between the PROFIBUS
master and the TJ1-MC__. For this, it uses the Trajexia VR
variables.
4.4.2 Communication set-up
The TJ1-PRT has two node number selectors. You can use the
node number selectors to assign a PROFIBUS network address to
the TJ1-PRT. You must assign an address to the TJ1-PRT before
you set the power of the Trajexia system on.
To initialise the TJ1-PRT, use the BASIC PROFIBUS command:
PROFIBUS(unit_number, 2, 1, output_start, output_count,
input_start, input_count)
where:
• unit_number is the number of the TJ1-PRT unit.
• output_start is the start address of the output data range of VR
variables.
• output_count is the number of VR variables in the output data
range.
• input_start is the start address of the input data range of VR
variables.
• input_count is the number of VR variables in the input data
range.
Note
The maximum number of VR variables to exchange data
is 122.
I52E-EN-03.book Seite 167 Freitag, 29. Juni 2007 11:55 11
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