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1 General
1.1.2 ISO reference model
It consists of a seven-layer hierarchy which is organized as follows:
•
Layer 1
Physical layer
•
Layer 2
Data Link layer
•
Layer 3
Network layer
•
Layer 4
Transport layer
•
Layer 5
Session layer
•
Layer 6
Presentation layer
•
Layer 7
Application layer
Further information on the individual layers and their functions are contained in Section 2.1.1,
"The ISO seven layer model".
1.1.3
LAN
ISO defines local area networks (LAN) as networks for bit-serial transmission of information
between interconnected independent devices (e.g. computers, microcomputers, programmable
controllers, numerical controls), i.e. the interconnection of autonomous systems.
"These are completely controlled by the users and limited to their site".
In factory plants, communication and exchange of information between the individual devices is
to take place in such a way that direct data access to all stations is ensured.
1.1.4
MAP
MAP (Manufacturing Automation Protocol) is a new communication protocol which is based on
international and US standards as well as additional specifications by GM. This protocol allows
an open communication in the factory (open networks) i.e. devices of different manufacturers
can be interconnected (opposite: closed networks).
1.1.5 SINEC AP 1
SINEC AP 1 is the Siemens Network Architecture Automation Protocol Version 1, a Siemens
automation protocol. It was developed for the integration of the following systems in a factory
automation system:
•
SICOMP computers
•
SINUMERIK
•
SIROTEC
•
SIMATIC S5
•
Programmers
•
MMC 216
•
Concentrators
•
Personal computers
•
Workstations
The protocol covers the OSI layers 5 to 7. For further information please refer to Section 3.3.1,
"SINEC AP 1 protocol".
1–4
© Siemens AG 1989 All Rights Reserved
08.89
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)
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