Glossary
Diagnostics
System diagnostics
Diagnostics buffer
The diagnostics buffer is a buffered memory area in the CPU. It stores diagnostic events in
the order of their occurrence.
DP (drive)
PROFIBUS interface that is controlled by the integrated technology of the CPU
isochronously (and therefore also equidistant).
DP master
A master which behaves in accordance with EN 50170, Part 3 is known as a DP master.
DP slave
A slave operated on the PROFIBUS with PROFIBUS DP protocol and which behaves in
accordance with EN 50170, Part 3 is referred to as DP slave.
DPV1
The designation DPV1 means extension of the functionality of the acyclical services (to
include new interrupts, for example) provided by the DP protocol. The DPV1 functionality is
integrated in IEC 61158 / EN 50170, Volume 2, PROFIBUS.
Engineering station
PC workplace, at which configuration work is performed on a control system.
Error display
One of the possible reactions of the operating system to a runtime error is to output an error
message. The other possible reactions include: Error reaction in the user program, CPU in
STOP.
Error handling via OB
After the operating system has detected a specific error (e.g. an access error with STEP 7),
it calls a dedicated organization block (error OB) in which the subsequent behavior of the
CPU can be defined.
Error reaction
Reaction to a runtime error. The operating system can react in the following ways: It sets the
automation system to STOP, indicates the error, or calls an OB in which the user can
program a reaction.
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
Glossary-3
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