BCU 460, BCU 465 · Edition 11.19
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Fieldbus communication
8 .1 BCU and bus module BCM
The optional bus module BCM 400 is required to in-
tegrate the BCU in a standardized fieldbus system
(PROFIBUS, PROFINET or EtherNet/IP).
Control signals (for start, reset and air actuator control,
for example), signal states from the device inputs and
outputs and information about the device status (op-
erating states, flame signal and current program step),
warnings and faults can be transferred simultaneously
via the bus module between the BCU and PLC.
The bus module for PROFIBUS BCM 400..B1 has a
9-pin D-Sub connection socket on the front, while the
bus modules for PROFINET BCM 400..B2 and Eth-
erNet/IP BCM 400..B3 have two RJ45 connection
sockets on the front for connection to the fieldbus. The
RJ45 connection sockets are combined with an internal
2-port switch. This allows the BCM 400 together with
the BCU to be integrated in various network topologies
(star, tree or line topology). Requirements such as Auto
Negotiation and Auto Crossover are satisfied.
Safety-related signals and interlocks (e.g. safety inter-
lock) must be wired independently of the fieldbus com-
munication direct between the BCU and the protective
system (e.g. FCU).
BUS
FCU
P
HT
M
PROFINET/
PROFIBUS/
ETHERNET IP
3PS
BCU
L1,
ϑ
66
65
67
90°
➔
0
0
➔
90°
BCM
Temperature
controller
PLC
All network components which connect the automation
system and the field devices must be certified for the
relevant fieldbus use.
For information on planning and the structure of a net-
work and the components to be used (e.g. cables, lines
and switches)
for PROFINET and PROFIBUS, see www.profibus.com,
for EtherNet/IP, see www.odva.org.