D Glossary
A-300
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
SINEC
Previous product name for-> networks and network components from Siemens.
Now: SIMATIC NET
Station
A station is identified by a
MAC address in the Ethernet network
PROFIBUS address in the PROFIBUS network
Subnet
A subnet is part of a -> network whose parameters (for example -> PROFIBUS)
must be matched. The subnet includes bus components and all the attached
stations. Subnets can, for example, be connected together by -> gateways to
form a network.
A -> system consists of several subnets with unique -> subnet numbers. A
subnet consists of several -> stations with unique -> PROFIBUS or MAC
addresses (Industrial Ethernet).
System
This means all the electrical equipment within a system. A system includes,
among other things, programmable logic controllers, devices for operation and
monitoring, bus systems, field devices, actuators, supply lines.
Transport layer
The transport layer is layer 4 of the ISO/OSI reference model for open system
interconnection. The purpose of the transport layer is to transfer data reliably
from device to device. Transport connections can be used for the transmission.
Transport interface
The transport interface of a SIMATIC S5 PLC is the access to the
connection-oriented services of the transport layer on the CP. The transport
interface presents itself to the control program in the form of handling blocks
(HDBs).
TSAP
Transport Service Access Point
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