Network Technology; Configuration; Bus Communication - Honeywell Krom Schroeder BCU 480 Manual

Function

3 .3 .5 Network technology

All devices are connected in a bus structure (line). Up
to 32 stations (masters or slaves) can be connected in
a single segment. The beginning and end of each seg-
ment is fitted with an active bus terminator. Both bus
terminators must have a permanent power supply to
ensure error-free operation. The power supply for the
bus terminator is provided by the BCU. The bus termi-
nator can be connected in the bus connection plug.
If more than 32 stations are implemented or if there is a
need to expand the network area, repeaters (amplifiers)
must be used to link the individual bus segments.

3 .3 .6 Configuration

When planning a PROFIBUS DP system, unit-specific
parameters of each station are to be taken into account.
To allow for simple and standardized planning, the pa-
rameters of the BCU..B1 have been summarized in a
so-called device master data file (GSD). The file struc-
ture is standardized so that it can be read by the plan-
ning devices of different manufacturers.
The GSD file is supplied on the BCSoft CD which is in-
cluded in the delivery of BCU..B1. The GSD file can also
be ordered at www.docuthek.com. The steps required
to copy the file are described in the instructions for the
automation system.
BCU 480 · Edition 03.16l

3 .3 . 7 Bus communication

Input bytes (BCU ➔ master)
Bit Byte 0
0
1
1
2
2
3
on
A
Reserved
4
on
P
5
on
DI
6
7
BCU 480 basic I/O
Output bytes (master ➔ BCU)
Bit Byte 0
0
ϑ 1
1
2
A
3
P
4 ϑ2
5 Reserved
6 Reserved
7 Reserved
▼
Byte 1 Byte 2 Byte 3
BCU 480 standard I/O
Byte 4
22