Saia-Burgess
Controls Ltd.
Hardware Manual for the PCD3 Series│Document 26/789; Version E 5│31.01.2005
Communication interfaces
4
4-1
Summary of onboard interfaces and plug-in interface modules
4
Communication interfaces
Saia
®
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.
Layer 2 (Field Data Link-FDL) from Profibus also allows parallel running of different
application 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 Saia
®
units into active network components.
Profibus Layer 2 (FDL) is integrated into the operating system of the PCD3.Mxxx0
CPUs and the PCD3.T76x RIOs, 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).
4.1
Summary of onboard interfaces and plug-in interface modules
USB
Ethernet (Port 9)
RS485 (Port 2)
Slot 0 (Port 1)
S-Net/MPI
(Port 10)
RS232/PGU (Port 0)
PCD3.M5540
PCD3.M3330
