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Glossary
Configuring:
By configuring we mean the grouping of individual modules to form an
automationsystem.
Counter:
Counters are component parts of the -> CPU system memory. The contents of
the"counter cells" can be modified by STEP 7 instructions (for example,
countup/count down).
CP:
Communications processor: Communications processors are modules for point-to-
point links and bus links.
CPU:
A central processing unit is the main processing unit of the automation system
witha processor, arithmetic unit, memory, operating system and interface for
theprogramming device.
Data block:
Data blocks (DB) are parts of the user program that contain the program data.
There are global data blocks, which can be accessed by all logic blocks, and
thereare instance data blocks, which are assigned to a specific FB call.
Default setting:
The default setting is a useful basic setting which is always used when no
othervalue is specified (assigned).
Electromagnetic compatibility:
By electromagnetic compatibility we mean the ability of an electrically
operatedresource to operate in a specified environment without influencing that
environmentin an unauthorized manner.
Equipotential bonding:
Electrical connection (equipotential bonding conductor) which gives the bodies
ofelectrical equipment and external conducting bodies the same or approximately
thesame potential, in order to prevent interference or dangerous voltages from
beinggenerated between these bodies.
Error handling using OB:
If the operating system detects a specific error (for example,an access error
withSTEP 7), it calls the organization block (error OB) which is provided for this
eventand which specifies the subsequent behavior of the CPU.
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Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
Windows Automation Center, WinAC Slot Version 4.0
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