BCU 460, BCU 465 · Edition 11.19 50
Fieldbus communication
8 Fieldbus communication
PROFIBUS DP, PROFINET and EtherNet/IP are man-
ufacturer-independent, open standards for industrial
network communication. They cover the requirements
for automation technology (manufacturing automa-
tion, process automation, drive applications without
functional safety). They are bus variants for fieldbus
communication optimized for speed and low connec-
tion costs.
1 2 3
L1
BUS
FCU
P
HT
PROFINET
BCM
BCU 4xx
BCMBCM
BCU 4xx
BCU 4xx
PLC
The basic function of fieldbus communication is the
exchange of process and required data between a con-
troller (e.g. a PLC) and several distributed devices (e.g.
BCM with BCU).
The signals from the devices are read into the controller
cyclically. There, they are processed and are then out-
put to the devices again.
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