Controls News 13
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Products:
Recommendations for field levels
It is strongly recommended not to connect
external devices from third party providers
to automation stations using proprietary bus
systems. For example, the Saia® S-Bus is designed
only for communications between Saia devices. It
covers internal system functions and should not
be used as an open, multi-vendor bus system. For
such applications, there is a wide range of standard
communication systems. Depending on the ap-
plication, it is advisable to use different communi-
cations technologies and media at the field level.
The profile of the different applications and the
differences between users are so great that that
there is no ideal package solution. Planners
and operators should each choose the most ap-
propriate technology for the field level. Saia® PCD
devices are designed so that different standards
can be integrated into a stable and maintainable
overall system. Of course, several bus systems in a
Saia® PCD control can be operated in parallel.
For full integration, it’s BACnet
There are buildings in which it makes sense to have
an integrated technology from the field level to
the control level. In this case, diversity gives way
to a certain homogeneity. So the bus system must
be chosen in a far-sighted way. The world standard
BACnet protocol provides all the necessary services
for standardized communication from the field de-
vice to the management system. Saia® PCD systems
are so flexible that they can be adapted to almost
any technology. However, if there is a choice, Saia-
Burgess recommends BACnet. With BACnet, the
management and automation levels are processed
with BACnet IP and the field level with BACnet
MS/TP on the basis of RS485. RS485 cabling is now
generally used by non-specialist personnel all over
the world. This has resulted in high market shares
in America and Asia. These countries already have a
leak of skilled workers as central Europe will have in
approximately 10 years as a result of demographic
change.
Diversity:
Conventional sensors and actuators with Saia®I/O modules.
Maximum freedom for servicing with minimum complexity of
the overall system.
Diversity:
The more bus systems in the field, the greater the flexibility and
functionality – but the complexity of the entire system increases
disproportionately.
Communications module and conventional I/Os in combination.
Saia®PCD1.M2120 with M-Bus and PCD3.M3330 with Belimo
MP-Bus
Saia®M-Bus interface module
Saia®PCD3 with I/O module
for conventional sensors/actuators
Saia®PCD3 with output modules,
including user manual
