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2 Local Area Networks
2.1.3 SINEC H1
2.1.3
SINEC H1
SINEC (Siemens Network Architecture) stands for the integrated communication system of the
Siemens automation systems.
This includes:
•
The communication network
•
The respective module which establishes the connection to the communication network
(interface module)
•
Protocols and services used for transmission of data between the systems.
SINEC H1 is a baseband transmission communication system to IEEE 802.3 (Ethernet).
It is based on the reference model of the international standard committee ISO for open
communication aiming at operating different types of devices together.
The SINEC H1 layers 1 and 2a (transmission procedure and network access) are based on the
IEEE 802.3 standard. These layers are concerned with data transmission and the access of
the nodes to the network. The access method is based on the collision principle used by
Ethernet. SINEC H1 provides for the higher layers a standardardized interface which is
independent of the access method.
Layer 3 of the ISO reference model is required for large networks. This layer is inactive with
SINEC H1.
For layer 4, SINEC H1 has implemented the ISO transport protocol (ISO-8073 class 4).
The functions of layers 1 to 4 are implemented by SINEC H1 on communication processors
which are located on the interface module. They offer the user a series of services which
relieve him/her from work-intensive procedures.
At present there are no uniform international standards for layers 5 to 7 of the OSI model for
the NC applications. As a first step to standardization of OSI layers 5 to 7 within the company,
Siemens have therefore defined the AP 1 automation protocol. It is suitable for use on all
Siemens automation devices.
For more details on the SINEC AP 1 protocol please refer to Section 3.4, Protocols.
The most important features of SINEC H1 are:
•
Topology:
•
Transmission medium:
•
Segment length:
•
Connectable nodes per segment:
•
Transmission method:
•
Data transfer rate:
•
Bus access method:
2–8
bus (line) consisting of one or several segments
shielded coaxial cable; 50 ohms
max. 500 metres
max. 100
baseband
10 Mbits/sec.
collision principle
© Siemens AG 1989 All Rights Reserved
06.91
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)
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