Hardware Manual

Saia-Burgess Controls AG

Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-22

Communication interfaces

4

4 PCD Classic 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.

For PCD2.M480 only:

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 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 Saia® NT operating system. With

the new operating system higher transmission rates (Saia® S-Bus up to 115 kBit / s)

can be achieved, however low baud rates (300 and 600 Baud / sec.) are no more sup-

ported.