Siemens SIMATIC ET 200AL, System Manual

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Glossary
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
Update time
An IO device / IO controller in the PROFINET IO system is supplied cyclically with new data
from the IO controller / IO device within this time interval. The update time can be configured
separately for each IO device and determines the interval at which data is sent from the IO
controller to the IO device (outputs) as well as from the IO device to the IO controller
(inputs).
User program
In SIMATIC, we distinguish between the CPU operating system and user programs. The user
program contains all instructions, declarations and data by which a plant or process can be
controlled. The user program is assigned to a programmable module (for example, CPU, CM)
and can be structured in smaller units.
WAN
A network that extends beyond LAN boundaries and enables, for example, intercontinental
network communication. Legal rights do not belong to the user but to the provider of the
communication network.
XML
XML (E x tensible M arkup L anguage) is a flexible, easy to understand and easy to learn data
description language. Information is exchanged using readable XML documents. These
include continuous text supplemented by structure information.