Instruction Manual
7NG3213
110
SITRANS T3K PA
C79000-B7174-C55-04
7.3
Properties of the PROFIBUS-PA
The PROFIBUS-PA enables bidirectional communication of a bus master with the
field devices via a screened two-wire line. At the same time the power is supplied
to the two-wire field devices on the same lines (current
I
in Figure 7, page 109).
Profile
Supplementary to the EN standard 50170, the PNO (
P
ROFIBUS
U
ser
O
rganisation) has defined the functionality of the individual field device types in a
so-called profile description. This profile defines minimum functional requirements
and optional extensions. The device-internal ”Device Management” supplies the
configuration tool of the control system with all the necessary basic information for
finding the profile parameters. With this a parametering tool can operate all profile-
conform devices no matter of what type and manufacture.
Depending on the size of the system and thus the number of field devices, the
system must be implemented with one or more PROFIBUS-PA channels.
A PROFIBUS PA channel consists of the components shown in Figure 8.
PLS, PC
FD
PROFIBUS-PA
PROFIBUS-DP
additional
T
FD
Control stand
Field
T
Coupler
Power
supply
Legend:
T
Terminating resistor
FD
Field device
PC
Personal Computer
PLS
Process control system
Figure 8
PROFIBUS--PA architecture
Содержание SITRANS T3K PA
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