Lika XAC80 PB, Руководство пользователя, Страница: 12 / 60

•
select modules and their I/O data length
(configuration identifier);
•
read texts to assign diagnosis IDs to HMI displays;
•
select supported services (freeze, sync, etc.);
from the GSD for the configuration of the device. A GSD
replaces the previously conventional manuals or data sheets
and thus already supports plausibility checks during the
configuration phase. Distinction is made between a device
GSD (for an individual device only) and a profile GSD, which
may be used for devices that comply exactly with a profile
such as a "PA device". GSDs for different languages may be
provided in separate files with corresponding file extensions
(*.gse for English, *.gsg for German, etc.) or altogether in one
file (*.gsd). The device manufacturers are responsible for the
scope and quality of the GSD of their devices.
Ident Number See "Device Identifier".
Notes:
•
the ident number is necessary for all DP devices except
for Master Class 2;
•
the same ident number may be used for modular
devices as long as the device can be described in the
GSD file as a modular device.
Identifier In general: a symbol that establishes the identity of the one
bearing it. Within this context here it represents an absolute
value of a parameter such as a physical address. It is intended
for systematic and performance handling capabilities within
computer systems, e.g. sorting, consistency checking, physical
localization and alike. Usually an absolute value is associated
with a logical value to represent the particular deployment of
the identifier. Typical abbreviation for identifier is ID.
IEC 61131-3: A combination of letters, numbers and underline
characters, which begins with a letter or underline and which
names a language element. Some of the major identifiers
within PROFIBUS DP are:
- Data type numeric identifier;
- Configuration identifier (Cfg);
- Device identifier (ident number);
- Manufacturer identifier (MANUFACTURER ID);
- Profile ident number (PROFILE ID).
Index IEC 61158-5: Address of an object within an application
process.
The permitted range in PROFIBUS DP is 0 - 255. Indexes are
used to address records of data (parameters, variables, state
information, commands, etc.) within modules of a field device.
PDU (Protocol Data Unit) A packet of data passed across a network via telegrams. The
term implies a specific layer of the OSI seven layer model and
a specific protocol. Each layer has its own PDU that is
extended subsequently from the physical layer up to the
application layer: