Siemens SIMATIC S5 Manual page 316

Distributed i/o system
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RS 485 repeater
RUN
Segment
Shared-input
master
Shield impedance
Short–circuit
SINEC L2
SINEC L2 DP
Slave
Standard-section
busbar
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Device for amplifying bus signals and linking
distances.
An operating mode of the DP master.
The DP master cyclically reads the input data of the DP slaves and sends
output data to the DP slaves. The DP master is participating in the token ring.
The bus line between two terminating resistors constitutes a segment. A
segment includes 0 to 32
RS 485 repeaters.
Other DP masters can have read access to a DP slave assigned to a
parameterization master. The other DP masters are known as shared-input
masters.
In COM ET 200 Windows masks, DP slaves assigned to a shared-input
master appear gray.
AC impedance of the cable shield. Shield impedance is a characteristic of the
cable used and is usually specified by the manufacturer.
A conductive path established by a fault between two conductors that are
normally energized in operation when the fault circuit thus created does not
include a working resistance.
SINEC L2 is a bus system which links PROFIBUS-compatible
programmable controllers and field devices on cell and field level. SINEC L2
runs the protocols DP (= Distributed I/O Periphery), FMS (= Fieldbus
Message Specification) or TF (= Technological Functions).
The SINEC L2 bus system with the DP protocol. DP stands for Distributed
I/O Periphery.
A slave can exchange data with a
the master.
Slaves are, for example, all DP slaves such as ET 200B, ET 200C, etc.
Metal busbar of a section standardized in EN 50 022.
Standard-section busbars are used to secure the devices in the SIMATIC
family, for example AG 100 I/O modules, ET 200B, etc.
segments over large
stations. Segments can be linked by
master only when requested to do so by
Glossary
Glossary-9

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