User Guide

FS-8700-20 Profibus DP Driver Manual Page 20 of 22
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Hence, an Input buffer in the slave will write data to the master, and data will be
received from the master in the output buffer.
o Remember that as a slave, the FieldServer will have to write data into the input
buffer (function=wrbc), and read data from the output buffer (function=rdbc).
• The Profibus card may be faulty.
• If this is the case, then there will be an error message in the FieldServer RUI error
screen indicating that the card could not be reached. Check for this message. If it is
there, try opening up the FieldServer and re-seating the card. If this does not help,
contact FieldServer Technical support for jumper settings on the card, and further
possible troubleshooting or return authorization.
• The Data Type/Offset/Length combination may be incorrectly set up
o In the FieldServer configuration, the Offset Parameter almost always refers to the
buffer offset in bytes (starting at 0), regardless of data type. The only exception is
the BIT data type which specifies offset in bits to allow for offsets that are not a
multiple of 8. The Length parameter always refers to length in items, which
means Float data will be the number of float values, Word data will be the
number of words, etc.
Appendix C.2. FieldServer as a Profibus Master
The most important aspect of using the FieldServer as a Profibus Master is that the .bss file
must be configured and loaded into the FieldServer as bridge.bss. The SST configuration
tool must be used to configure this file. This tool can be found on the SST CD supplied with
the FieldServer.
As a Master, the FieldServer also needs to have the pfbdp.ss1 file loaded, and care must
also be taken with direction of communication and Data type/length specification. Note that
as a Master, the FieldServer will be writing to Output buffers (function=wrbc) and reading
from input buffers (function=rdbc).