Siemens 7MB2335, Руководство по эксплуатации, Страница: 34 / 168

Technical Description
3-12 Operating instructions ULTRAMAT 23 gas analyzer
C79000-B5276-C216-03
The PROFIBUS user organization (PNO) is an independent inter-
national institution, and represents the interests of many vendors
and users. In addition to services such as consultation, training
and device certification, its prime task is the further develop-
ment, standardization and promotion of the PROFIBUS techno-
logy. The definition of a binding functionality for a device class in
a profile is a prerequisite for the uniform response of devices
from different vendors, the so-called interoperability.The
profile
for analyzers was defined as binding at the end of 1999, thus
guaranteeing the interaction of all PROFIBUS-based devices in
a plant.
This profile defines the functionality of the analyzers in a block
model: e.g. the
physical block describes the measuring proce-
dure, analyzer and vendor names, serial number and operating
state (operation, maintenance). Various
functional blocks con-
tain the execution of specific functions such as the processing
of measured values or alarms. The
transducer blocks describe
the functionality of the actual measuring procedure and its con-
trol, e.g. preprocessing of a measured value, correction of cross-
interferences, characteristics, measuring ranges as well as
switching and control procedures. Protocols define the data
transmission between the stations on the bus.
A differentiation is made between cyclic and acyclic services .
Cyclic services are used to transmit time-critical data such as
measured values and statuses. The acyclic services permit the
scanning or modification of device parameters during operation.
All gas analyzers of Series 6, (ULTRAMAT 6,
ULTRAMAT/OXYMAT 6, OXYMAT 6, OXYMAT 61, FIDAMAT 6
and CALOMAT 6), as well as the ULTRAMAT 23 are suitable for
PROFIBUS when fitted with the optional plug-in card.
AK interface (only OXYMAT 6, ULTRAMAT 6 and
ULTRAMAT/OXYMAT 6)
The user benefits of numerous functions especially in the auto-
motive industry, e.g. to operate a re-linearization
Unlike to PROFIBUS and ELAN, communication between only
one unit and one PC is possible and operates according to the
master-slave principle. The unit only transmits data on request
with a command message, but always only command can be
processed and answered.
Funktion 88 permits to call the menu and to set the parameters.