Siemens SIMATIC ET 200AL System Manual page 1206

Communications Cycle and Reservation of Transmission Bandwidth
PROFINET IO is a scalable real-time communication system based on the Layer 2 protocol
for Fast Ethernet. With the RT transmission method, two real-time-support performance
levels are available for time-critical process data and IRT for high-accuracy and also
isochronous processes .
Communications processor
Communication processors are modules used for point-to-point and bus connections.
Configuring
Selecting and putting together individual components of an automation system or installing
necessary software and adapting it for a specific application (for example, by configuring the
modules).
Consistent data
Data which belongs together in terms of content and must not be separated is known as
consistent data.
For example, the values of analog modules must always be handled as a whole, that is, the
value of an analog module must not be corrupted as a result of reading out at two different
points in time.
CP
Communications processor
→
CPU
Central Processing Unit - Central module of the S7 automation system with a control and
arithmetic unit, memory, operating system and interface for programming device.
DCP
DCP (Discovery and Basic Configuration Protocol). Enables the assignment of device
parameters (for example, the IP address) using manufacturer-specific
configuration/programming tools.
Default router
The default router is used when data has to be forwarded via TCP/IP to a partner located
outside the local network.
Determinism
Determinism means that a system responds in a predictable (deterministic) manner.
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
Glossary
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