3.5.4 Properties
PROFIBUS PA allows bidirectional communication between a bus master and field devices. At
the same time, the shielded two-strand wiring provides auxiliary power to the two-wire field
devices.
3.5.5 Profile
As an extension to the EN 50170 standard, the PROFIBUS user organization (PNO) defined
the functionality of the individual field device types in a so-called profile description. This profile
determines minimum functional requirements and optional extensions. The device-internal
"Device Management" provides the configuration tool of the control system with all necessary
basic information to find profile parameters. One parameter assignment tool serves all profile-
conforming devices, regardless of type or manufacturer.
Depending on the size of the installation (and therefore the number of field devices) and the
time behavior required, you implement the system with one or more PROFIBUS PA strands.
One PROFIBUS PA strand consists of the components shown in the following figure.
352),%86'3
352),%863$
7
&RQWUROURRP
&RXSOHU
3RZHU
VXSSO\
$GGLWLRQDO
WHUPLQDWRU
)')'
)LHOG
3&6
3&
7
Figure 3-12 PROFIBUS PA strand
FD Field device PC Personal Computer
T Terminating resistor PCS Process control system
Reference
PNO PROFIBUS-PA interest group
3.5.6 Connection
Control is performed by the central process control system (PCS) or by a PC for lower-
performance requirements.
Description
3.5 PROFIBUS PA
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC 35
To Next Page
Loading...
Need help?
General
