Siemens SINEC L2 User Manual

S5-95U, SINEC L2 System Description
1.2 The SINEC L2 Local Area Network
The SINEC L2 LAN is based on the PROFIBUS Standards (DIN 19245).
PROFIBUS (PROcess FIeld BUS) is the German process and field bus standard that is defined in
the PROFIBUS Standards (DIN 19245). This standard sets up functional, electrical and mechanical
characteristics for a bit-serial field network. The purpose of these standardization efforts is to be
able to network programmable controllers and field devices of different manufacturers without
expensive adapters. Therefore, you have the ability to mix and match components from different
manufacturers, and to have them communicate with each other via the SINEC L2 network as long
as the components meet the PROFIBUS Standard. The SINEC L2 network services of the S5-95U
use part of the services defined in the PROFIBUS Standards.
In order to be able to use S5-95U programmable controllers as SINEC L2 stations, you need one of
the following two items:
• The RS 485 bus terminal that connects SINEC L2 stations via the terminal cable with the bus
cable that connects the individual bus terminals with each other.
• The SINEC L2 bus connector with bus cable that connects stations with each other.
Figure 1-2 represents a bus segment using SINEC L2 bus connectors.
Figure 1-2. Bus Segment
a a a a a a
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S5-95U
S5-95U
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Bus cable
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SINEC L2
station
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SINEC L2 bus connector
(terminating resistor switched off)
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a
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a a a a a a a a a a a a a a a a a a a a a a a a a
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a a a a a a a a a a a a a a a a a a a a a a a a a
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SINEC L2 bus connector
(terminating resistor
connected)
S5-95U
In order to communicate, each station must observe certain rules:
• There must be a rule for who is allowed to transmit via the common bus cable at a given time
( section 1.3 “Procedure for Accessing the Bus”).
• A common language must exist between two stations
( section 1.5 “Types of Data Transmission”).
• The electrical features of the stations must match each other
( section 1.6 “Bus Physics”).
EWA 4NEB 812 6112-02 1-3

Siemens SINEC L2 Specifications

General

Brand	Siemens
Model	SINEC L2
Category	Controller
Language	English