Siemens Metro 21 M216KA Operator's Manual page 400

Glossary
Consistent data
D
Default setting
Device master file
Distributed I/O
devices
Diagnostics
DP master
DP slave
DP standard
Glossary-2
Data that belongs together by content is referred to as consistent data.
The data must not be corrupted by being read at different times.
The default setting is a basic setting that applies unless another value is set
(i.e. parameterized).
All the properties of a DP slave are stored in a device master file. The format
of the device master file is stored in the EN 50170 Volume 2, PROFIBUS
standard.
These are input/output units that are installed in a distributed configuration at
some distance from the CPU rather than in the central rack. For example:
ET 200L
ET 200B
ET 200M
Other DP slaves manufactured by Siemens or another company
The distributed I/O devices are connected to the DP master via the
PROFIBUS-DP bus.
Diagnostics is the detection, localization, categorization, indication and anal-
ysis of errors, faults, malfunctions and messages.
Diagnostics provides monitoring functions that run automatically while a
plant is operating. This enhances the availability of a plant by reducing setup
and stoppage times.
A master whose behavior complies with EN 50170 Volume 2, PROFIBUS
is referred to as a DP master.
A slave that runs on the PROFIBUS using the PROFIBUS-DP protocol
and whose behavior complies with EN 50170 Volume 2, PROFIBUS is re-
ferred to as a DP slave.
The DP standard is the bus protocol of the ET 200 distributed I/O system. It
complies with EN 50170 Volume 2, PROFIBUS.
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c