Profibus Dp/Pa - Siemens OXYMAT 64 Operating Instructions Manual

Description
2.6 Communication
2.6.4

PROFIBUS DP/PA

PROFIBUS DP/PA is the leading fieldbus on the market. All Siemens gas analyzers with an
optional – also retrofittable – plug-in card are Profibus-compatible and comply with the
binding "Device profile for analyzers" defined by the PNO (PROFIBUS International). Central
access to the system analyzers is possible with the SIMATIC PDM software tool.
"Fieldbus" is the name of a digital communication system with which distributed field devices
of a system are linked to each other over a single cable and are simultaneously connected to
programmable controllers or a process control system.
The PROFIBUS-DP version is widespread in production automation due to its high
transmission speed per device, while PROFIBUS-PA takes the required properties of
process engineering into account, such as use in Ex areas.
The benefit is the considerable savings potential in all areas of the system, covering project
planning and commissioning, operation and maintenance, up to subsequent system
extensions.
Operation of the gas analyzers from a control system or a separate PC is possible with the
SIMATIC PDM tool (Process Device Manager). This software executes under Windows
XP/Windows 2000 and can also be integrated in the SIMATIC PCS 7 process control
system. With this, the integration of the devices in the system as well as the complex
parameter structure of the analyzers can be clearly illustrated. Operating becomes simply a
matter of "clicking".
PROFIBUS International (PNO) is an independent institution and represents the interests of
many manufacturers and users. Besides services such as consulting, training and device
certification, its primary job is to further develop, standardize and promote PROFIBUS
technology. The binding functionality definition for a device class in the form of a profile is the
condition for standardized device behavior from various manufacturers, the so-called
interoperability. The binding profile for analyzers was defined at the end of 1999. With this,
the interaction of all PROFIBUS-compatible devices of a system is guaranteed.
In this profile, the functionalities of the analyzers are defined in a block model: for example,
the physical block describes the measuring procedure, analyzer and manufacturer name,
serial number and the operating state (operation, maintenance). Different functional blocks
contain the execution of certain functions, such as measured value and alarm processing.
The transducer blocks describe the function of the actual measuring process, as well as its
control, e.g. the pre-processing of a measured value, correction of cross-interferences,
characteristics, measuring ranges, as well as switching and control processes. The data
transmission between the bus participants is defined in protocols.
A distinction is made between cyclic and acyclic services. Time-critical data, such as
measured values and status, are transmitted with cyclic services. The acyclic services allow
device parameters to be queried or changed during operation.
All gas analyzers of Series 6 (ULTRAMAT 6, OXYMAT 6/61/64, CALOMAT 6/62 and
FIDAMAT 6 as well as ULTRAMAT 23) are Profibus-compatible with an optional plug-in
card, which can also be retrofitted.
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Operating Instructions, 06/2008, A5E00880383-03
OXYMAT 64