Saia-Burgess Controls AG
Manual
Manual PCD 1 / PCD 2 Series
│ Document 26
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737 E
N22 │ 2013-11-26
4
Communication interfaces
4-2
General informations
4.1.2 SBC S-Net
SBC S-Net, the networking concept from Saia Burgess Controls, is based on the
RS-485, Profibus and Ethernet open standards. Ethernet covers layers 1 and 2 of the
ISO layer model. Based on layer 2, a variety of different protocols and applications
can be run in parallel on the same network.
Using the SBC S-Bus
The proprietary SBC S-Bus has been designed essentially for communication with
the engineering and debugging tools, and for connecting the management level/
process control systems.
It is neither suitable nor approved for the connection of field devices from diverse
manufacturers. An open, vendor-neutral fieldbus will be more effective in achiev
-
ing this end.
For PCD2.M480 only:
Layer 2 (Field Data Link-FDL) from Profibus also allows parallel running of different ap
-
plication protocols such as DP, FMS and others. The use of this facility allows Profi S-Net
to be used to create a “Private Control Network (PCN)”. This makes all SBC units into
active network components.
Profibus Layer 2 (FDL) is integrated into the operating system of the PCD2.M480 CPUs,
giving these units a Profi S-Net connection with transmission speeds up to 1.5 Mbps.
These units support Profibus DP and S-Net on the same port. In this way, Profibus
can be used to construct networks cheaply and flexibly (detailed notes can be found in
TI 26 / 381).
Transmission rates (Baud rates) of the PCD2.M480:
The controllers of the type PCD2.M480 have a new SBC NT operating system.
With the new operating system higher transmission rates (SBC S-Bus up to
115 kBit / s) can be achieved, however low baud rates (300 and 600 Baud / sec.)
are no more supported.
