Glossary
Basic Panels
Operating Instructions, 04/2012, A5E02421799-03
155
Runtime software
The Runtime software is a process visualization software which can be used to test projects
on a configuring PC.
Screen
Mode of visualization of all logically associated process data of a plant. Visualization of the
process data can be supported by means of graphic objects.
Screen object
Refers to objects such as rectangles, I/O fields, or alarm views which are configured for
visualization or operation of the plant.
STEP 7
STEP 7 is the programming software for SIMATIC S7, SIMATIC C7 and SIMATIC WinAC
PLCs.
STEP 7 Micro/WIN
STEP 7 Micro/WIN is the programming software for SIMATIC S7-200 PLCs.
Symbolic I/O field
Symbolic I/O fields are used for the input and output of values. A field contains a list of
default entries from which one can be selected.
System alarms
System alarms are assigned the "System" alarm class. A system alarm reports internal
states of the HMI device and of the PLC.
Tab order
The tab order defined in the course of project engineering determines the sequence for
activating objects by pressing the <TAB> key.
Tags
A tag is a defined memory area that is used to read and write values. Those tags can be
accessed from the PLC or using the HMI device. We distinguish between external tags
(process tags) and internal tags, depending on whether or not the tag is interconnected with
the PLC.
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