Glossary
Subnet
A subnet is part of a
A
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.
Transmission rate
According to DIN 44302, this is the number of binary decisions transmitted per time unit. The unit is bps. he set or selected transmission rate depends on va- rious conditions, for example the distance across the network.
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 pre- sents itself to the control program in the form of handling blocks (HDBs).
TSAP
Transport Service Access Point
Watchdog
Mechanism for monitoring operability.
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