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Glossary
STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
201
Programming language
A programming language is used to create user programs and provides a defined language
subset for this purpose in the form of graphical or textual instructions. These instructions are
entered by the user with an editor and then compiled into an executable user program.
PTO
Abbreviation for "Pulse Train Output". Some CPUs, such as the S7-1200, can generate
quick pulse trains via the outputs, which are used to control the motion control operations.
Runtime
The runtime software executes the project in process mode and allows processes to be
operated and monitored.
Subnet
A subnet includes all the network devices interconnected without gateways. It can include
repeaters.
Tag
A tag is made up of an address and a symbolic name that is generally used multiple times in
the project. The address (for example, of an input or bit memory) is used in communication
with the automation system. Tags are used to perform a change of address (for an input, for
example) centrally instead of throughout the entire user program.
Target system
Automation system on which the user program runs.
Watch table
The purpose of the watch table is to assemble the tags from the user program that are to be
monitored, modified, and/or forced.
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